Gy6 50cc Chinese Scooter PAIR System Removal : 139QMB Emissions : Racing Only

[@Keon2991]

I would recommend re-jetting the carb main jet to 1 size bigger, since an egr/pair delete will slightly increase vacuum of the intake at full throttle, which draw more air from the filter.

[@tomsku69]

My PAIR system was some 20 000 miles old, it was spitting black watery oily stuff (carbon particles) from that open end hose (from the canister/filter, the Benzhou YY50QT-6 has a little different setup), the engine was running poorly, mileage was poor and engine keep hesitating ('jerky' might be word in english) randomly at worsening rate. Took me some time to find out the culprit, but thanks to your excellent video, the problem was finally solved!

[@Persianenzo]

My sym allo has the same problem, the previous owner had a little bottle at the end of that hose to catch the oil?gas? Mixture coming out, now that bottle fell off during my last trip resulting in the whole Engine covered with that fluid. So you solved it by taking the egr system out,like in the video? I'm curious why there's a fluid coming out instead of air, so maybe I could solve it instead of removing the egr or catching up the fluid coming out.

[@bubb062]

Got an 08 Baja 50 and so much of the PAIR system was missing I just didnt wanna buy all that crap and the only thing that there was is a hose to the bottom of the rocker cover and it was loud as hell.Thanks for the video and its bye bye EGR!

[@haroldcruz246]

You are super helpful. I don't know of anyone else on KZbin that has as much knowledge about these scooters as you do. And you get right to the point, not like 98 percent of them that you have to listen to 25 minutes of back story just to do something that takes 2 minutes to do. Awesome videos.

[@49ccscoot]

Thanks!

[@kevinearles1]

@@49ccscoot Hey were does that rubber hose coming of the valve cover actually run to? Mine runs into the air filter box. Is that where it should go? Keeps having gas pour from it

[@49ccscoot]

@@kevinearles1 The one at the top of the valve cover is a crankcase vent and usually goes to a port on the airbox. It should not have gas coming out of it. If there's gas in the airbox, it should not be from that hose. It's more likely a carburetor issue, like high float height.

[@kevinearles1]

@@49ccscoot it runs to a little cylinder thing that hooks up to the air filter. I know it's gas and maybe a little oil mix but mostly gas. I know it's coming out of that valve cover tube because I can take it off and watch it pour out as it's running. Dies the minute I hook the air box back up. Even if I take the actual filter out and hook up the empty box

[@nibba3595]

@@kevinearles1 you have gas in your oil your needle valve is not sealing the gas out

[@moultriemanicmechani]

the other reason to remove it, is the cheap diaphragm in the canister often fails, causing a massive vacuum leak right to your intake manifold. mine failed at 500 miles, hooked a hand vacuum pump and gauge to the control line going to your manifold, which opens the diaphragm, and it would hold zero vacuum

[@williamhumphries8133]

i just put a better head for the 100cc bore kit thanks for the info I couldn't get it to start without getting rid of the system u helped me a lot and save me about 40 bucks

[@iulianciocan5672]

nice , i showed this to my friend who has a gy6 scoot , hes gonna want this mod for ++ performance , thx chief ! julian here :D

[@49ccscoot]

It's not really going to do much for performance.

[@iulianciocan5672]

@@49ccscoot it cant do mutch harm ... hes getting gasoline into his air filter ...

[@49ccscoot]

@@iulianciocan5672 He may also want to check his valve/cam timing.

[@ejb2184]

you sound like that smart guy off walking dead

[@49ccscoot]

Never seen it.

[@gocaveman]

ejb 84 lol Eiuyin or however you spell it 😂😂😂

[@enlightenednews5265]

ejb 84 LOL he does. Just clicked.👍

[@michael-en4kq]

lololol you win funniest comment of the day

[@kiran-wh9wg]

Eugene😅😂😂😂

[@소율̈-o3y]

hello.I live in korea. your video very good. thank you.

[@HighestRank]

소율꙼̈ in which Korea?

[@The77pgl]

hey bud, its me again. LOL. I figured it out. My scoot has only traveled 1980km....so roughly 1100-1200 miles, and the culprit was the vacuum line that runs from the intake to the PAIR system. It was real stiff, and had a split in it as I sat on it the split opened and of course when I got off it closed. I work on vehicle and see stiff/brittle vac lines on vehicles with high mileage just found it odd that it happened on this scoot. I bought it brand new 3 kms on it from the dealer. Alls well that ends well. Thanks again for the ear to vent to, and the suggestions. And yet again for the great info vids! CHEERS!

[@49ccscoot]

Glad you figured it out. These are often cheap hoses, routed quickly and without anyone down the line to double check before they're sent out.

[@progaragechinskiemotorki]

i pyk katalizator skrócił swą żywotność :D to jest system SLS daje świeże powietrze do spalin co wydłuża żywotność katalizatora w tłumiku :)

[@49ccscoot]

Yes. It's not the sort of mod that everyone should do.

[@michaelhudson3445]

Hey you taught me something I couldn't find very much information about! Thanks alot!!

[@danibot3000]

What consequences will this have with/for a stock exhaust since it's, to my knowledge, there to improve the dynamics in the exhaust at cold start regarding catalysator? Is there a chance that the catalysator will clog up with carbon and stuff because of the lower heat? Or am i "thinking wrong"?

[@49ccscoot]

You're thinking is correct. That's the main risk. Obviously more emissions, but also potential for premature buildup.

[@49ccscoot]

Mine had 2 ports on the intake. One to PAIR, one to petcock. I ditched the vacuum petcock for a manual shutoff during the PDI. I've got a vid of that up as well.

[@dendys04]

yeah thanks a lot i did this but i didn't had a welder machine so i just used some bolt and nut to plug off the plate

[@Cito_Fiytb_617]

Instead of blocking off that corner with a plate,I left it and removed everything else it was alot of hoses about 12 for me since I also removed the fuel pump and just put it directly from gas tank to carb,way better in my opinion and for the hose on valve cover I removed that and put a rubber bushing right over it and wrapped an aluminum zip tie to hold it.....not sure if it's because I have a Briggs and Stratton exhaust and its very small but my 150cc pops so loud from deceleration that people literally think I'm doing a drive bye lmao (dead serious) its been awhile since I've had it hasn't given me any issues as if yet but I just upgraded to a free flow carbon ebay exhaust just have to fix my exhaust leak now and hopefully test it out see how it runs

[@NashCustoms]

what dose this do and why would you take it off what's it change?

[@49ccscoot]

The PAIR system injects air into the exhaust stream to help continue burning the exiting gases and reduce emissions. There is no need to remove it from a stock scooter. The only benefit would be less stuff to go wrong or less clutter. If you install an aftermarket exhaust the PAIR system may cause popping in the exhaust. Using aftermarket cylinder heads you may not have a PAIR connection anymore so some remove the rest of the components then to get them out of the way since they can no longer function.

[@moultriemanicmechani]

all the rubber parts in the canister are cheap Chinese made rubber, which will fail and cause a large leak right to your intake manifold, it's not a matter of it, but when

[@rimantassadeikis3515]

hey i need help :D with my gy6 engine :D so when its cold and i give it full throthle its wants to die out but when its warm it runs beter the other problem is that my gy6 is derestricted so it should run around 80-85 km/h but it run only around 60 km/h any sugestions ??? #sorry for bad english :D thanks

[@jessemiller3801]

NashCustoms b

[@whittluk3339]

Thanks for your help, this weekend ill be checking the timing again, do you think it could be something to do with the valves?

[@49ccscoot]

You won't get power from it if it's functioning properly. Eliminating this can help if you get popping in the exhaust with an aftermarket pipe. Otherwise, just removes some clutter.

[@thelagmeister]

Will it help if it shoots fire ?

[@49ccscoot]

@@thelagmeister It's possible, but that could be a lean condition or an exhaust leak.

[@thelagmeister]

@@49ccscoot Thanks. EX. is airtight . I have a 50mm kit, stock head, 19mm carb w/90 jet at high elevation. If I figure it out I'll be back. Huge thanks for everything you've done for the Scooter Community.

[@ДилянДинев-р7я]

You save my scooter with this video the monteur say to me the blcok is fone en need a new one today i did this now is runnimng much better

[@austinnfoster9863]

Scooter god

[@integra91ah]

one more question... can. you just block off the valve cover vent all together or does it need to be vented ?

[@Frietpan]

hmm, allot of these videos i see these scooters have the filter/cannister. my scooter has a pair system but the big hose goes into my airfilter and the valvecover vent also goes into the airfilter. why is that diffrent on mine? also is my scooter choking on its own exhaust gas?

[@49ccscoot]

You may have EGR and not PAIR.

[@Frietpan]

@@49ccscoot oh is that the difference, i think its called SLS in europe tho, then the pair system is better as it atleast dumps the exhaustgas to the filter>>atmosphere? with the sls it just dumps back into airbox. i ordered me a non sls valvecover + blocking plate and airbox without the sls hose fitting. im curious to see if it makes a difference.

[@amyflores18]

I bought a new scooter and the big hoses came half cut what time of hoses is it so I can buy a replacement because I asked the merchant and they said that the hoses is suppose to be like that but your video proves them wrong

[@49ccscoot]

They could have changed in design by now or sometimes people mistake EGR for PAIR so be sure of what you have first. Anything attached to intake vaccum needs to be vacuum hose. A lot of things could probably work for others.

[@Fanatiekeling747]

Nice video! I have the system with: - Hose from top valve cover to airbox. - Airbox to SLS membrane. - Sls membrane to lower connection Valvce cover. And a vacuum line from intake manifold to sls mebrane to activate it. Actually about the same as yours. Cant I just disconnect vacuum hose from sls membrane, close the hose. And leave the rest hanging as it is?

[@49ccscoot]

Probably, but if you're leaving everything in place there's not much point of doing this. The emission system won't hurt performance if it's operating properly and you're not cleaning anything up that way so IMO you might as well leave it and keep it legal and cleaner.

[@Fanatiekeling747]

@@49ccscoot Thanks for your reply. I have 2 GY6 scooters. The other 1 has a hose from top valvecover to airbox. And a small pipe with filter on lower side valvecover. The scooter im asking about with the system in your video has the issue that after driving it my clothes smell from exhaust gasses. The other scooter has 0 issue with that. I was thinking maybe I can test if with the sls disconnected the smell is gone. I use the same oil in both scooters. Your method would stop the gasses at the lower left of the valve cover. ID say that if I only disconnect the vacuum hose that activates the membrane, my gasses would run from lower left side of valvehead through the hose and stop at the sls mounting on the frame where the membrane / 'pump' is located. This way no recycling these gasses through my airbox adn maybe a bit less smell. Id think and hope its no problem to have the gasses run and stop at the unit there.

[@49ccscoot]

@@Fanatiekeling747 Sometimes you get a foul smell in your gear if the air/fuel mixture is off as well.

[@Fanatiekeling747]

@@49ccscoot Yeah true, but I would like to try without SLS first. This scooter has some weirdass behavior. It is running too rich, with a 82 main jet, but when I put a 80 mainjet it staggers between 15-40 kmh. I tried to different mainjet 80's in case it was a manufacterer mistake or so, but same results. Ill have a look into that also. Especially now the weather has gone up 20 degrees lmao.

[@whittluk3339]

Hi there you helped me not so long ago with a variator problem, thats all fixed now thanks for your help! however now i have the Motor back in the back, when fired up the bike seems to run hot within around 30 seconds or so, and the exhaust is untouchable, i know the airbox isnt blocked, as i took that apart and replaced the filter could you help me or give any advice? also the idle adjuster screw seems to be jammed in the same position and i cannot up the idle, thanks for your help!

[@Tipi83]

Hi! Is it necessary to plug that vent hose from your valve cover to your air box..? Thanks for the answer in advance!

[@49ccscoot]

The one on the top is the PCV vent and should not be plugged.

[@firebladex8586]

@@49ccscoot mine has no one way valve attached. Is that normal sometimes ? Edit: I also don't have a charcoal canister

[@49ccscoot]

@@firebladex8586 There are multiple configurations on Chinese scooters.

[@jstark2388]

If it is not blocked off properly, what problems would you have?

[@the64bitter]

Dogs and cats getting along, chickens raiding the fox den, vegans eating meat- Sheer Chaos!😂 Also, an unpleasant noise, possible burnt valves, melted bodywork, etc.

[@benkr5870]

hey cool video ! question, does the piston sucks the fresh air in the exhaust valve ? what pushes the fresh air into the exhaustport ?and for blokkage ,what if you just squeeze the hose on the cilinder and block the intake ?is that also enough or ?

[@daribertopena891]

Excelente siempre quise eliminar esa vainA

[@MrBerenguer67]

Thks four your video I have a Peugeot V-Clic 50cc 4T I start the scooter the idle keep up and down can you please let me know way thank you very much 😮

[@49ccscoot]

#1 would be to look for an intake/vacuum leak.

[@georgiemelendez6154]

your videos r very good thank you.

[@49ccscoot]

Thanks!

[@49ccscoot]

Won't hurt the engine. Could potentially shorten the life of the stock muffler/cat.

[@khaledbenz1424]

But it hurt the environment

[@bumblebob5979]

@@khaledbenz1424 Then go buy an Ford V6 SUV. They have latest catalytic converters and fuel injected engines. Only use Premium fuel to make it feel smoother. Makes enviroment happy and your feelings returned back to safe and normal.

[@Mrsmith42e]

@@khaledbenz1424 scooters burn a tiny fraction of the fuel used in any car on the road. Negligible amount of difference.

[@pageman8185]

since the gy6 uses no fuel "pump", and it uses suction to get fuel to the carburetor then there has to be a certain right amount of suction as to balance the air/fuel combination, right? (besides the air/fuel screw)

[@49ccscoot]

+page fullerton As long as the tank is above the carb, it's a gravity fed system. Gravity pulls the fuel down to the carb. The only suction involved is if you use a vacuum petcock and that just takes engine vacuum to pull on a diaphragm and allow fuel to pass by.

[@drdrew3]

The fuel system gets its vacuum from the intake side. Because all of these mods are on the exhaust side there is no adverse effect on gas delivery. Those two vacuum systems aren’t connected to each other

[@mrjaybennett80]

Terrific video. I especially enjoyed the Nicolas Cage presentation. Question I noticed that the other side (left) you had that capped off already so what do you have at the petcock vacuum valve? Assuming you have a three way valve there. Is that capped also?

[@49ccscoot]

Mine is a barb at the tank so I just swapped over to a manual shutoff valve inline easily.

[@sanchir82]

this is super helpful, whats the ventilation hose you plugged back in last, where does it go? and can I get rid of it? thanks

[@49ccscoot]

That's the crankcase vent. DO NOT plug it or get rid of it. It goes to the airbox, but you don't want to seal off the crankcase by plugging it.

[@Dark-hy7fg]

Can you help me, i forgot to connect ventilation hose and i notice that when my 125cc scooter gets warm the oil comes out out of that hose is this normal? Should i just connect the hose in air filter or? Tnx

[@Donbscooters757]

What advantage is there for removing the emissions from the motor .. although none of my engines ever had them on it when i got em so ...but im just wondering

[@49ccscoot]

None really aside from less stuff to fail and less clutter.

[@craigmatthews3651]

@90gtvert what do you do with the hole left where the reed valve was? Also one of my vacuum hoses on the inlet assembly pipe goes to my vacume fuel pump what should I do about that, thanks.

[@49ccscoot]

If you do it all like the vid and have the same setup, there should be nothing else to deal with around the valve. You can keep the vacuum pump. Just make sure there are no Ts or junctions where a leak is created by removing other vacuum accessories. Can run a hose direct from the intake to the pump to simplify in most cases. If it's a pump, you need to keep it. If it's a petcock, you can swap for manual and plug off the vacuum source if you'd like.

[@craigmatthews3651]

@@49ccscoot Thank you for replying so fast, I have a kymco agility 4 stroke the fuel tank is lower than the engine it seems my fuel line comes up from my tank, to a fuel filter , to a one way valve and into the vacume petcock, I took the external fuel line, (going to carb) off the petcock I then cranked the bike over and no fuel came out, so I presumed it's just a vacume petcock. My question is, is it possible that my bike has no fuel pump at all AND a tank lower than the engine, can the carb suck fuel itself? Either way, I bypassed the petcock and attached the fuel line directly from the fuel tank (which is lower) to the carb, and the bike ran for a few minutes before cutting out, after this it would have cranked over until the battery died, had I not re attached the fuel line to the petcock and layed the bike nearly on its side and cranked it over with no throttle for a couple minutes, I eventually got it to start and it idled horribly and kept cutting out at the slightest hint of throttle until eventually it started ticking over well enough again. I'm presuming I flooded the bike and maybe fouled the plug a little? If my bike doesn't need a fuel pump, because it ran fine for 3 minutes whilst the fuel tank was attached directly to the carb, why did it cut out? If that is the case might it be because I flooded the engine and fouled the plug slightly? I have upjetted to a 88 on a 18mm carb, instead of the factory 12mm carb with an 80 jet because I have been having issues with the bikes speed, hence why I was playing with this In the start, thank you very much for you're time. imgur.com/a/c6W3qUq

[@49ccscoot]

@@craigmatthews3651 What you have is a pump, and you need it. The carb won't suck the fuel up there. It needs the pump. Probably ran on what was in the bowl and then died.

[@craigmatthews3651]

@@49ccscoot Okay thanks bro I rechecked fuel pump and I had a loose vacuum hose, that's fixed now, back to figuring out why this bike refuses to past 50kmh

[@firebladex8586]

@@craigmatthews3651 if its a 50cc thats about as fast as they go

[@fitzwater504]

So, I had pulled all my old stock air box off. Then changed to a upgraded air intake filter. It would not run tell I tap a hole in the center of it. Then put the small line coming off the top of the valve cover line into it. Like it went to my old air box stock. So, what I’m wondering what would happened if, u ran the big hose on the bottom to the upgraded air filter? Does it suck or push a vacuum? Could this make it run better possibly. I know it maybe a-bit excessive to go back straight into the intake filter again . But, what about straight hose. No can filter at all? I know the air/fuel ratio would be effected. But, could you run more lean possibly?

[@49ccscoot]

You'd be better off leaving the PAIR system as-is. Let the PAIR valve and reeds control vacuum as intended and don't introduce vacuum where it shouldn't be on the air inlet.

[@TRAIL_MIX_BILLY]

The 150cc looks the same. I can do all this on it. Hose on the valve cover was left on. Makes the motor louder. When I out hand over it gets quiet. So I can remove this and it's safe?

[@49ccscoot]

If done as shown, it should be fine.

[@TRAIL_MIX_BILLY]

@@49ccscoot I put a bolt in the hole. Worked just fine.

[@kaikruner6971]

mm, my hose goes straight to the air filter and the hose from the intake to the fuelpump, thats on a 50cc Kisbee from 2011. Never thought they could be so different.

[@GY6-SCOOTERS]

Nice content

[@HobbyOrganist]

Mine had a factory installed plate already installed blocking the opening up! LOL they put the whole thing on, hoses and all to fake it, but it was never functional

[@josephdanmathis1876]

where does the other end of the ventilation hose go, the hose you left on the top of the valve cover

[@49ccscoot]

+joseph mathis That goes to the airbox. It is a crankcase vent.

[@49ccscoot]

@Sergei V You don't want to just leave the crankcase vent open at the cover or it's likely to spray oil or at least oil vapor. Ideas : 49ccscoot.proboards.com/thread/997/crankcase-venting?page=1&scrollTo=13285

[@Raivo080]

What are the pros and cons of removing it?❤

[@49ccscoot]

Pros are basically less clutter and less stuff to fail. Cons are that it's not legal for street use and increases emissions.

[@Fanatiekeling747]

Btw, the exit lower left of the valve cover where a pipe is connected, Simply said the one you either make or buy a block off plate for. What is really behind this, I mean gas is pushed out through it, but where does this entrance go to? What actually happens to the pressure when u block it off?

[@49ccscoot]

There's a passage in the port. The port just operates as a port normally does. I'm sure there must be some effect, but I couldn't tell any difference either way.

[@Fanatiekeling747]

@@49ccscoot Interesting. :) You wouldnt happen to know where the port goes to?

[@49ccscoot]

@@Fanatiekeling747 It's a passage that goes to the exhaust port. The system injects air into the exhaust stream.

[@Fanatiekeling747]

@@49ccscoot AH so. thanks! So in reality the hose that comes from the air filter box that goes to the sls filter actually transports fresh air to the sls filter and then the hose to the port on the cilinder head sends this air out through the exhaust port. Hella I had it the other way around. Thinking the sls port on the cilinder head sends warm air to the aitfilter box. SO easily said worst case scenario, only the top thin hose on the valve cover sends warm air to the air box filter. Meaning that disconnecting the big hoses on the sls on my scooter would only give me worse smelling air.

[@enricofabioCortese]

excuse a question; at 2: 13 you are removing an hose from a jet on the head. My question is: where was connected that hose? Or it was at free air?

[@49ccscoot]

It went to the canister shown in the vid.

[@moxleycrueTv]

Mr. Monotone Voice

[@49ccscoot]

Hello and nice to meet you Mr. Useless Remark.

[@Hasan_OZ]

I love his voice and style, clear and easy to understand

[@thomasDSoundDesign]

I need some advice!? I have a 50cc GY6 engine. im having to replace the cylinder and cylinder head, due to damage. so I thought I would just buy a 80cc BIG BORE KIT. but all the kit dont have the PAIR system on them. they are all covered/sealed (like what you have done in your video) My question is, does it matter if i get a cylinder without the ERG/PAIR inlet?

[@49ccscoot]

You can get the kit without PAIR and then just remove the rest of the PAIR stuff or find one with PAIR and leave it.

[@thomasDSoundDesign]

***** Thanks

[@whittluk3339]

Thanks for replying yes it really is that fast its ridiuclous, the pipe isnt clogged at all thats been checked, i do not have a timing light or a spare CDI as i am new to scooters would a CDI solve the problem? and the fly wheel is all fine as i replaced the belt and did a routine check last week and havent riden it since, and nope the idle hasnt bottomed out thanks for your help!

[@awhitlock8794]

what's the big hose that's connected to the valve cover ?? what's it called isit the egr hose or something

[@49ccscoot]

I'm not sure what exactly it should be called. It's just a hose.

[@_li1.loc3_8]

i watched someone do the same thing exepct they connected one of the vacuum lines to the carburetor instead of plugging it off will this work ? what is the difference between plugging it and connecting it all

[@49ccscoot]

If the carb has a port that is meant to be a vacuum port, that can work.

[@islamayman5927]

What if we removed only the hose that go to intake manafold of canster ?

[@49ccscoot]

The system won't function as it should, but you'll still have the stuff in your way if you go to make a repair. Might as well take it all the way off if you're going to mess with it IMO.

[@islamayman5927]

@@49ccscoot i mean remove the hose from intake and closed it then make the hose under point of my scooter .. then it would be problem to my scooter ?

[@stephencline7226]

Well I first want to start off by stating, "truly inspirational" 90GTVert!! Hopefully you can help me with my situation. I have 150cc Wolf Blaze scooter. I just replace the Cylinder Head. The manifold I received does not have the Emissions connection like the factory one similar to yours. Since I've changed everything my scooter will not start, it just tries and tries to turnover however will not start. I did not block any particular jets and I believe it is an open air Emissions system. Could this be the cause of my scooter not turning over? Thank you for your time.

[@jaykoerner]

Well 6 years later so doubt I'm helping you, but I would guess valve clearance needs adjustment, if it's out of spec it won't start

[@nibba3595]

@@jaykoerner lmao

[@jaykoerner]

@@nibba3595 figure there's a chance I'm helping someone else that sees the comment in the future

[@integra91ah]

is it OK to completely block off your intake vacuum line like you did? I thought you need at least one vacuum line ? so I have a line to a filter for my valve cover vent. and I'm going to do a manual shut off like you did. I already removed the pair system.. so that would block off both vacuums ports on the intake... is that OK ?

[@49ccscoot]

There's no requirement to run any outside accessories, so as long as they are gone it's not an issue.

[@integra91ah]

Thanks for the reply. Your always very helpful. Cheers

[@SwPiotrek]

Cool video.

[@reneaangenaam5515]

Great video! there is one thing i still dont understand, so i hope you can help me. it seems the air gets in the carter on top of the valves so to ventilate the oil. how and where is the air introduced to the exhaust gas? my 50cc gy6 has a 80cc upgrade along with a 24mm carb and a little forced air intake. it runs smooth and powerful, but with horrible backfire and i hate to see an old lady get a heart attack becaused by my moped. if this causes it, i will get rid of it asap, but is this helps cooling and ventilating the oil id rather keep it, so i need to know, how does the air reach the exhaust gasses

[@49ccscoot]

Crankcase venting and PAIR systems are 2 different things. The PAIR system is for emissions and crankcase venting is necessary to avoid pressurizing the crankcase. WIth PAIR, air is introduced in the exhaust port. Backfiring could just be a lean condition or a leak near the header.

[@reneaangenaam5515]

ive checked again but it seems i was wrong bevore. so if im correct the hole in the head just leads to the exhaust? that whould explane why it is black on the inside (if the flow is going the wrong way). i think its purpose is to add fresh air to the exhaust gasses to burn of any remaining fuel and stop doing that on decel to prevent popping. mine was defect and adding fresh air all the time. anyway thnx man my problem is fixed !! If anybody has the problem with popping on decel either remove or replace this part shown in the video, it helped mine !!

[@49ccscoot]

As long as the system is functioning properly, you won't get any power gain by removing it.

[@thedaydreamer7972]

Hi, I removed the emisions from my chinese 150 and added a uni intake, and now I having issues running properly, here is my question, from the PCV on valve cover there was 1/4 in running to the airbox, and then from the gas tank there was a second 3/16 hose, not the fuel line, running to a cannister and the cannister was hooked to the airbox, now I just have both of those hoses vented to the air, I wondering if one of them needs to be plugged, namely the one coming from the fuel tank and not the PCV, Im thinking that may be the issue, any ideas? TY so much for you videos

[@49ccscoot]

The hose from the fuel tank may just be evaporative emissions.

[@bumblebob5979]

Professional instructions, topp class! :) I wonder what this system does, leads exhaust to intake or air to exhaust catalytic? I might reinstall this on my Taotao. Regards!

[@49ccscoot]

It puts air into the exhaust to help burn off previously unburned fuel and reduce harmful emissions.

[@bumblebob5979]

@@49ccscoot Do you think that i can have it modulated without reed valve to let exhaust run out of it and lead it back to intake after carb for selective power reduction. I guess it should feed overpressure after exhaust valve, making a home made Exhaust Gas Recycling system, with electric solenoid it should be a smart road power limiter. Do you know about how much this cylinder head compare to non-PAIR reduce power and torque as it is made with this not too flow maximized extra exhaust vane. Regards :)

[@49ccscoot]

@@bumblebob5979 I don't think there's a lot of difference with or without PAIR in these.

[@bumblebob5979]

@@49ccscoot Yea, I still put some money in this so it will unfortunately bug my mind nevertheless.

[@twopiecez5226]

What's inside the PAIR?do i need to clean it? And also for the egr do i also need to clean it? Do you have videos for that

[@49ccscoot]

Unless you put on a lot of miles, you really shouldn't have to mess with that stuff beyond making sure hoses are in good shape.

[@MrRJRAMPAGE]

What does doing this do does it add performance?

[@ELViSLOK]

Do u need to plug the intake on both sides ? So just delete vaccum hose?

[@49ccscoot]

You have to plug any unused connections on the intake. If you have hose going to something like a vacuum petcock, then leave that alone.

[@stephenpricesdp1982]

Where do you get your parts from

[@Lyndon539]

I have a 125 kymco scooter with modified exhaust. Could I just plug the vacuum line that goes to the pair system, so it will not open the canister and inject fresh air, instead of have to block the exhaust outlet?

[@49ccscoot]

+lancerevogolfmk1 Never tried it. To me, the biggest reason is getting all of that stuff out of my way.

[@rncboy2]

Did you block off the valve cover also? Or just the top of the block?

[@49ccscoot]

Just the passage on the head.

[@mrpopo2189]

So does i need thet to turn on engine or not cuz im to remove eny usless wheight (thet black hose)

[@tronixfix]

Why would you "race" a 49cc 4 stroke??! 😂

[@slaughternut]

HaLuNkE ST0NER more for mudding and beating the shit out of it

[@bumblebob5979]

Why would you spend 45grand on a vehicle you dont dare to touch when you can follow this video and have it for free!???

[@Tomijus]

Will i get popping if i dont remove the system and get performance exhaust

[@49ccscoot]

That's pretty common.

[@Tomijus]

@@49ccscoot Can you please do more vids about this scoot tuning? 🙂

[@trpldc99]

How did you re route the rest of the hoses ?

[@dusanpetroski3224]

Hi men I do that and my ventilation hoys spinning something like a water. Should I block it or please tell me what to do with it With respect D. P

[@49ccscoot]

49ccscoot.proboards.com/thread/997/crankcase-venting

[@محمدمظفر-س8ي]

Hello.....Iam cancel and plug system pair in my scooter....it's right?????

[@ErmaTheKitteh]

I have a similar system on my scoot but instead of going to open air, the tube goes to that vacuum tube assembly but the hose goes to the intake in the middle of the airbox & the carburator.. gyazo.com/bca7915b7a7f2f2b8a0ceb667112a78b The orange tubes are from the head to the intake, ignore the green vacuum tubes, but where I ringed in the thing where the vacuum goes to and the tubes, in the seam there it leaks something that seems like oil, is it like some kind of EGR valve? the exhaust doesn't have any tube that would connect to and EGR system so im kinda confused.

[@49ccscoot]

I'm guessing that's another variant of a PAIR system. Not sure why it would be leaking oil there. First thing would be to see if you could get that to seal by verifying that any fasteners are secure. If they're secure taking it apart and applying a thin coat of sealant like copper RTV may do the trick. Does the scooter smoke or seem to use oil?

[@ErmaTheKitteh]

It does seem to use ever so slight ammount of oil but I think that was because i changed to part syntetic before the break in period was fully done or even partly done since i couldn't find conventional non-synthetic oil for a good price, i'll take a look into it, tho if i take a similar hose and jam a nut into the other end and use some kind of epoxy or similar to block that pipe, would that be bad? Also regarding the smoke, it can really only be seen when its dead cold and if you hold some black background, havn't noticed any smoke as of late, the smoking problem was when i changed the oil at about 50km into the breakin period, now it has 188km and i dont seem to notice any smoke or such, i filled the bike up with 750ml of oil and it seems to be at the top of the X's ( the top X on my dipstick is exacly 750ml)

[@49ccscoot]

You could remove the inlet and vacuum hoses and cap the nipples on the inlet and intake off. Then you'd just have to deal with the hose to the head. If it's like what's in the video you can see it's not tough to block off. You could probably block it with a bolt and clamp or something like that, though I'd prefer other methods.

[@Nwonotepad]

***** Please, can you help me? Any other way to condemn the PAIR system without having to weld? Parts for PAIR are hard to find and expensive. I would glady reinstall one if I can get my hand on parts. Mine got taken away. If you know something that I could use to replace the large hoses instead of buying them, it would help. I would only have to buy the canister and the filter. I think I found hoses, but they are expensive. Have you ever saw the exit hose of the PAIR going in front of the scooter, under the platform? Mine goes there. Tomos Nitro. Your video is very well explained, helped me out understand my problem. Thank you!

[@49ccscoot]

Enviromoto sells a block off plate for about $7-8 shipped, or did last I checked. I've also heard of people just installing a sheet of something solid that can hold up to heat between the existing tube and head. You could make a blockoff pretty easy with a small piece of steel and a drill.

[@capchassuck]

I've seen a pair system where the big hose just runs straight to the muffler pipe ..

[@bumblebob5979]

I had this from factory. But not this PAIR system. Must be a way to make it harder to run dirty.

[@pageman8185]

okay so where does that ventilation hose on the valve cover go to? open end or what?

[@49ccscoot]

+page fullerton It goes to the canister. Watch the vid again and it is shown.

[@dedeabsrn8044]

For gy6 50cc, valve adjust suction how many mm. How many mm of exhaust. must be

[@49ccscoot]

I'm not totally sure what you're asking. If you just want exhaust valve adjustment specifications in mm, I use 0.065-0.08mm.

[@SKYWATCHER_GEE]

Where does the ventilation hose go to mine is missing

[@لطيفالحلفي-ح7ض]

my honda spacy bik a 100cc engine a gasoline jacuzzi. What is the feler mumber for the gasoline jacog and the number for the exhaust jacog in mm

[@49ccscoot]

.002" intake, .003" exhaust, usually works pretty well.

[@لطيفالحلفي-ح7ض]

@@49ccscoot Dear this measurement is it the company's service system? A solution is not included in the manual

[@49ccscoot]

@@لطيفالحلفي-ح7ض That's not a service manual specification. Actually, I misread and thought it was a Chinese engine for some reason. That's the spec I'd use for the Chinese made 50-150cc. Being a Honda, you should be able to find a service manual somewhere online. The regular owners manual will not list this info.

[@rafaelsuarez9783]

since you removed the reed valve wont air come out of the bottom of the plate now?

[@49ccscoot]

+Rafael Suarez It's all blocked off where it needs to be.

[@rafaelsuarez9783]

*****​ OK thanks bud! I did what you did and seen it really wasn't nothing there to begin with. ...thanks a bunch much appreciated. But now I have a problem that I thought the big bore would fix and that is when I give it gas it doesn't bog down or anything it just won't go past 15 miles an hour. It's like if I was dragging somthing heavy. I'm thinking its the variator weights or the spring in the transmission. Any suggestions?

[@49ccscoot]

If you haven't gone over the whole CVT, I would : kzbin.info/www/bejne/aHbNiGCfiLVgh5o

[@rafaelsuarez9783]

+90GTVert yeah I went over the variator and found that the last person who checked it(that's when it all started) did not set the rollers back correctly. she runs great now. thanks for the tips and quick responses. much appreciated have a merry Christmas.

[@49ccscoot]

Glad it's fixed. Happy Holidays.

[@sfaustina]

Can you tell me how to replace forks/shocks on a taotao 50? Can't find any videos on the subject... is it much work?

[@49ccscoot]

You'll need to take off the front plastics and the wheel and tire and brakes. Then if it's just the shocks that you want to replace, there are usually 2 bolts in each side to clamp them into the steering stem. Loosen those and they should slide out. You may need to loosen or remove the cap on each shock in some cases for them to come out. If it's the whole steering stem and all, then you need to get the plastics and handlebars off. You'll have to disconnect quite a bit of stuff to remove the handlebars totally. Then there are nuts at the top of the frame holding the steering stem in that have to be removed. Support the front and remove it carefully. Don't lose any bearings that are in there. Some are just loose ball bearings and some have a cage so they're easier to manage. Grease the bearings well on reassembly. Also, you must be very careful with how tight the steering stem is when you put it back together. It needs to be tight enough that there's no up and down play, but loose enough that the steering can move freely. Too tight and the steering binds and that makes it really tough and dangerous to ride. You can check out service manuals from name brand scoots (something like a Yamaha Zuma for example) and they usually go over the full procedure with a few illustrations.

[@sfaustina]

Thank you so much! I used all your pdi videos. So good! Yeah got a zummer 50 shipped with wrong forks installed! Well i'm not really, sure forks or shocks. and not sure if i need to do the steering stem. The speedo notch and fender attachment holes is what alerted me. They didn't match up......One other quick question, i have all plastic off now, should i do a big bore now? or put put plastic back on and put some miles on the stock?

[@49ccscoot]

It depends what you prefer. Some people like to install BBKs right away. Others prefer making sure the scooter runs alright first.

[@sfaustina]

Thank you. i'll good with the latter, I'm a noobie

[@georgiemelendez6154]

Any help will b good thenk you.

[@harleydog111]

Have you ever come across a situation where the reed valve broke or cracked causing air to flow constantly? if so would that situation cause the engine to run poorly at rpms higher than idle?

[@49ccscoot]

+David moore I have not personally experienced this. I suppose it's a possibility. You could disable it and know for sure.

[@thedirtymammal]

Why not make a gasket that has Bolt holes but no center hole and reassemble?

[@49ccscoot]

I believe some have done something similar. I like the idea of getting it all out of the way if it's eliminated though and I have a welder so it wasn't a big deal.

[@kmajic5]

Hey, I need help from you 90gtvert, i have same 139QMB engine on my scooter and I need to adjust valves, what numbers should I use for intake and for exhaust, please write them in mm not in inches, sorry for bad english

[@davidoverstreet0246]

.003-.004 on both valves

[@davidoverstreet0246]

.003-.004 on both valves

[@NeonxNomad]

help please everytime I drive my 150cc Chinese scooter all my oil leaks out of the ventilation hose

[@jasoncarr3471]

rainbow dash either your piston rings and or your valve stem seals are bad. Does it blow blue smoke from the exhaust?

[@NeonxNomad]

Gave it away

[@NeonxNomad]

When the oil pump chain broke

[@awhitlock8794]

the hose on top of the valve cover where does that go mate

[@49ccscoot]

That's the crankcase vent and usually runs to a port on the stock airbox.

[@awhitlock8794]

Do you know where roughly on the stock airbox it goes mate what port mate

[@49ccscoot]

With my airbox, looking at it from the side, there was a nipple on the bottom front/left for the crankcase vent hose.

[@awhitlock8794]

Okay mate isit 2 parts of hose or isit just one long hose from the top of the valve cover to the airbox

[@larryhannah1]

im having a problem with my taotao 50 cc. the problem is that when i cranck the scooter it sounds like it barly runs but when i give throtal while its on the 2 leg stand it will run pretty good but if i hold the back brake or put it on the ground i can give wot and it sounds like it is barly ideling. this happened after the drive belt broke. i replaced the belt and noticed this happening. im thinking its a power issue. could this be a carb issue?

[@49ccscoot]

+larry hannah My first check would be to go over the whole CVT. Any time a belt breaks, you can get debris in any part of the CVT. The entire CVT should be cleaned and checked over. Check out my full service CVT inspection video for help.

[@larryhannah1]

Thank you and that helped a lot again thank you

[@MrHarleyreinke]

What do you do about the hole in the valve cover?

[@49ccscoot]

Everything should be covered here. If the system is the same as what is shown in the vid, then there won't be anything else to deal with.

[@AB-dl1hz]

Watch the video idiot

[@SharkRoads]

Can i know the reason that it should not be removed from a vehicle was using on public roads ? 👈

[@49ccscoot]

Tampering with emissions devices on road vehicles is not legal in many areas.

[@bobfuzzy3342]

Hi i am trying to make my scooter make pops and maybe flames but I tryd a bigger get and even more stuff but I can't get my scooter to shoot flames or make pops so when I remove this egr system will I get pops and maybe flames or what does it do exactly I just wanna make my scooter pop so ye pls answer this question I have been searching for so long and I can't find it btw I do have an open exhaust so. 🙏

[@49ccscoot]

I've had pops and flames with nothing more than a leak near the header before. Had a pinhole in the header of a pitbike and it would shoot a 6" flame out of a full length aftermarket exhaust. Te difference with it and the scoots was that I could free rev it. Just rev and let off and it would bang out a flame.

[@bobfuzzy3342]

@@49ccscoot wdym with Pine hole in the header of your pitbike Where exactly do u have a hole and can i also fully remove it like u did. will it be aible to shoot Flames or Pops as well than and does it not like damage the motor if I do long distances as well wtf I have a scooter not a pithike so idk if it's the same ty for answering!?

[@49ccscoot]

@@bobfuzzy3342 In my case, it was a manufacturing flaw. A weld where the flange connected to the pipe had a pinhole in it. Just a tiny hole. I wasn't trying to make it do this. It was purely by accident, but I have to admit that I had fun with it. You can try it and see what happens, but IMO any time you're trying to make the bike shoot flames or pop you don't have the engine's health as a priority. If it doesn't work, then you have a tiny hole in the exhaust. Use this info at your own risk and so on, and of course don't blame me if you get in trouble if it works. This is for off-road and exhibition use only.

[@proteusmacapagal1453]

hello sir.. can i ask if that's okay to use flat head piston? i ordered china brand with the flat head piston

[@49ccscoot]

I'd advise checking piston to valve clearance and squish. At minimum, mock it up and turn the engine over by hand to make sure nothing is hitting. Some of the cheap kits are coming with pistons without valve reliefs and other issues that are ruining engines when installed assuming they'll be fine.

[@proteusmacapagal1453]

hmmm i think your suggestion is right sir, i will try it tomorrow.. thanks :)

[@paultoomey7016]

Sir I hate to keep bothering you but now this brand new TAO 50 Scooter that I assembled gets really hot after only going 3 miles and the oil is cold. When I turn it off it it’s making a ticking sound and engine is extremely hot! Oil is cold could you tell me what this would be because I can’t deal with these online Superior Powersports people anymore. Thank you so much. Paul

[@49ccscoot]

Can't say I've heard of that. So, specifically what part of the engine is hot and how are you measuring or judging the temperature?

[@paultoomey7016]

@@49ccscoot If I go around the block a couple times the motor is very hot but the oil is like it just put it in temperature. I don’t know and I’m terrible with computers and 60 years old so I’m just hoping I’m doing this right with you

[@49ccscoot]

@@paultoomey7016 Have you got the shrouds installed on the engine? It will get very hot quickly if the shrouds for the fan aren't installed.

[@JonahNAloha]

Just wondering where does the other end of the ventilation hose go to? Anyone knows?

[@49ccscoot]

It's open to air.

[@moultriemanicmechani]

The canister part really does nothing, the reed valve let's air into the manifold, why it closes when the scooter is off is a mystery, my canister failed in all possible ways at 200 miles, if you stuck a filter on the end of the hose going to the head, it would function the same

[@randallcanter2127]

any performance gains ,ganed after pulling off emissions

[@49ccscoot]

Mostly just gets things out of the way, less possible leaks, and it may eliminate popping in the exhaust with free flowing mufflers.

[@dusanpetroski3224]

I hope you anderstand me I can't upload photo so please give me instructions

[@tattoodirt]

If you block the intake manifold vacuum nipple then how do you connect the vacuum line from the petcock to the thing?

[@AB-dl1hz]

The vacuum line from the peacock was never disconnected idiot

[@kongenisinghetto2327]

whats the point in doing this? any power difference?

[@49ccscoot]

No power difference. If you swap to more free-flowing exhausts, you may get popping in the exhaust with the PAIR system.

[@tjayismael9692]

doing this. does it make it n e faster. or perform better. if n e one knows. please let me know

[@49ccscoot]

No. This is not a mod for performance purposes. If you ever install a free flowing exhaust you may find it necessary to avoid popping in the exhaust.

[@tjayismael9692]

thanks man.

[@ColombianCasanova]

i have a metal box with a hose on my 150cc exhaust, is that a pair system?

[@49ccscoot]

Not sure. Is the hose just going to the box, or is the box attached to the exhaust and then the hose leads somewhere else?

[@ColombianCasanova]

there is a metal box attached to the muffler header and there is a hose on the box?

[@49ccscoot]

Might be something like a PAIR, to get more oxygen into the exhaust.

[@ColombianCasanova]

***** ok i found out, i actually have a EGR which is welded to the exhaust pipe, can you make a vid on how to take off a EGR system, there is not much info on EGR stuff and on the forums everybody confuses it with the pair system which u covered with this vid

[@49ccscoot]

I don't have anything with an EGR system to take off. It should be a sorta similar process. Basically removing hoses and capping things that are left open. May have to crimp/weld if there's a large exhaust connection.