GY6 valve adjustment: HOW TO

[@Roland-Henry]

Clear cut, no pillow talk, and straight to the point. Thanks for this.

[@ZPDSurvival]

I am here for the valve adjustment. Have a great weekend.

[@noneshere]

GY6 149cc Tune Up Specifications.... .003 - .005 Inch : Intake .005 - .007 Inch : Exhaust ( .076 - .127 Metric : Intake ) ( .127 - .178 Metric : Exhaust ) Idle Speed : 1700 , +/- 100 RPM Spark Plug : NGK C7HSA Spark Plug Gap : 0.6mm - 0.7mm Engine Oil : 15W40 👍 Thank You

[@RollingWrench]

P E R F E C T 👌

[@dedeabsrn8044]

@@RollingWrench for 50cc ? in or ex ?

[@Catalysis1144]

Thanks for your clear instruction videos. What are the symptoms to know that I need to do valve adjustment? or in other words, when do I need to do it?

[@noneshere]

Every 600 miles is recommended but you'll hear the valve chatter buzzing with the rpms when they do loosen up. Loose valves restrict the air flow because the valve is not being fully pushed open. Often you'll have low engine power and the engine will want to bog down when dumping the throttle open. When the valves are super loose and the engine is about to fail, you'll notice the engine will quit when dropping the scooter down off it's center stand.

[@ezurmnd]

So im installing a big bore kit 100cc on a 49cc. I read somewhere to do the intake .004 and exhaust .006. Now i watched a lot of your vids and also bought from your store before because of the knowledge. Should i do .004 all around or 004 and 006 mind im installing an a9 cam

[@wgswgs1818]

Why .004 and not .005 or .006 I’ve watched so many videos and none are saying why. What happens at .005 or .006 gain or lose of power.

[@drunksanta1427]

if there is too much play in the valves, the valve will open later, close earlier and the valve wont open as deeply. So more clearance is less power. If the valves are too tight, the valves will not close all the way, leading to backfires and/or exploding carburetors

[@jdub_bkv6598]

I recently checked my valve lash and there was very little clearance so I adjusted to .004 for int and exh, now I have a loud clicking noise. I set to .004 and turned engine around to TDC to confirm it was good. What should I do now to cut down on the noise?

[@alexlintern9779]

Hi RW I have a 2019 Keeway Fact Evo 50 which is - I believe - an EFi GY6 engine and the alloy valve cover has 2 (an upper and a lower) large inspection ports (large cast alloy caps with hex nut heads) to check/adjust the cold valve clearance. This EFi engine does not have a EGR pipe as on this video at 0:41

[@austinfarmer459]

What does it mean if one of the rocker arms ain't aligned with the center piece of the valve

[@greatcesarsghost]

Hello I did a adjustment on a buddy 150cc I manually rotated engine on the wheel ( with chain ) it had a line on each side ( left - right ) and on top it had a number marking when I rotated again a hole appears on it ....so I rotated it with lines parallel with valves and hole on top side that was top center I go and adjust them .. rotate engine two cycles back to top center measure again and the shims fit fine so I put it together and no start .. was having starting issues now i really have starting I even covered carb opening before it would start up now nada ☹️ should I of used the other side with the marking and not use the small hole as top center ?? Guide ..

[@DanieMations]

Sorry to say it, but its probally fucked.

[@evangriffin1073]

Timings off bud the T is what marks the top not the hole lol

[@greatcesarsghost]

Thanks for late reply .. helps

[@greatcesarsghost]

DanieMations I assume u have no knowledge or mechanical skill the other person who told me bout the marking was right the scooter runs better and faster .. surprised but I’m glad I did not listen to your advice ..

[@nova-j7r]

Hey, I can’t remember what it sounded like before but now it sounds kind of “clicky”. She is running good but that worries me a little bit. I might just be tripping out since I realize now there is a little gap, I set it at .004 with feeler gauges.

[@RollingWrench]

Go back and double check it

[@nova-j7r]

@@RollingWrench Might need to close the gap a little for sure.

[@rickymejorada1250]

Do you mean. 004 caburator intake .005 outtake or exsaust right

[@mrAq_pA]

So... INTAKE and EX will have the same clearence ?

[@2weird4evr]

nice vid man, however i adjust them at 3 spots. Tdc, one valve closed and the opposed valve open and the compression stroke when both are closed. Did it last week just before the oil change 10w40. Runs smoother and your taking in account for lobe wear on all sides. Realy, before all this it was bogging like crazy, now i can ride the living shit out this little 50cc without any problems. Ofcourse remove all the emmision crap(the dutch authorities dont care about it)and rerouted the valve cover hose above the engine with a breather filter.

[@rookairsoft9818]

Where is the hose on top of the valve cover supposed to go?

[@maniacse]

@@Germygerm38 really? I think it is vent and mine leads to airbox. Do we talk about same thing here?

[@consalez25]

This not going to petcock,petcock hose are connected to intake manifold and to carb,they are vacume hoses. This hose can be free( sometimes little filter on it or to airfilter box)

[@robertbell1804]

I never known how to do this but it actually looks easy

[@roywalls5595]

Hi Matt they got video for Saber Cat 200cc valve adjustment for this bike!

[@enginer804]

gy6 50cc end 80cc intake-exhaust valve adjustment ? inch/mm ?

[@julietteahraribas5731]

Thank you very much! however should you pull the whole engine out of your scooter to do this?

[@RollingWrench]

+Mr Natuur The engine can stay in the machine. It just makes for better video viewing

[@greatcesarsghost]

To do a valve adjustment ?? I did a valve adjustment on a big ruckus 150 cc had no problem why would u take out the engine ???

[@botskifani22]

You dont need to take it out but you can since its just 2 bolts and some wires

[@mennop8182]

How much valve adjustment in and out do i need to do on a A-9 camshaft ?

[@1989Mazda2200]

.004 inches or mm?

[@willian_vp8354]

Inches

[@saltysteel3996]

Four thou, so 4 thousandths of an inch.

[@grahamrushin4384]

Inches

[@sandeepram8429]

Hi, my scooter was making noise, I did the valve clearance and it was solved, but after two days it's like before again. What could be the causes and how could I resolve it?

[@servantoftheservant5022]

Hi the hose on the front of the valve cover where does that go thanks southafrica

[@CannondaleF700]

Good video! My p152qmi engine tdc is pointing at an arrow rather than the T mark?

[@noneshere]

On 149cc 157QMJ or 157QMI's : when you set the magneto directly on the " T " Line, the camshaft alignment holes Won't be perfectly level with the engine heads upper lip. The lower hole will be slightly above the head lip and the upper hole will be right at or slightly below the head lip.

[@richardgodwin4198]

does the intake and exhaust need to be set at 004? someone told me to set the intake at 003?

[@cemtkeenan2750]

.003 intake .004 exhaust allows the timing of the intake and exhaust opening ro be maximized for improved flow thru of combustion gasses, so ive read.

[@jasonharrington218]

May I have a link for that wrench and adjuster piece?

[@RollingWrench]

www.rollingwrenchdenver.com/products/gy6-qmb139-valve-adjustment-tool

[@CozmicLay-lg7gd]

Does the gap of the valves vary if you've put better and upgraded parts of the engine?

[@RollingWrench]

No, always the same

[@yf48353]

You saying .0004 but in my tool i have 0.04 i dont have .0004 and also 0.04 on my tool is soooo thin!! its like hair! Fly with the wind.. which number should i use? Is there any international numbers?

[@RollingWrench]

0.004

[@harrywest8100]

Ok bro I did the valve adjustment and it's perfect to me it idles perfectly thank you for that. So do I have to turn out a 1/4 turn on the air fuel mixture because I can roll in on the throttled and it fine but I can nail it and there's a little bit of hesitation but picks up. The air fuel It's true strew is at stock location. I have aftermarket exhaust coldair intake change my main jet from 108 to 120 I gave your gear up setup 10gram weight and the 1000 clutch setup. So back to the question do I need to 1/4 out on the air fuel mixture strew?

[@opinionatedviewer7730]

My gy6 starts and dies if i dont give it gas you think this is the issue? I do

[@ShakotanRon]

Hello, wondering if this will work, like it did for my Ktm My feelers somehow where exposed to a corrosive and are no longer useful, a trick I learned on my Ktm was to do it by the turns. Soft seat, then back out to correct clearance. M5x.5 makes each quarter turn .125mm .005in=.127mm .004in=.1016mm

[@socksonfeet8125]

Does it have to be lined up with the T or the line right behind the T? I've read and heard people say its one or the other? Which one is it actually?

[@User-jw58b]

The line

[@NotThePulla]

I watched this video like 10 times while doing my bbk install and A9 cam, and im still getting alot of tapping from the valve area. I tried all different valve lash settings from .005 down to .002. still getting a good amouint of tapping from the valve area. Wondering if i can go down to .001 and roll the flywheel over and see if im feeling compression or if thats too small of a gap?

[@NotThePulla]

i checked and double checked TDC and rolled the flywheel over a few times and rechecked gap at .002 before startingup. I even ordered a replacement rocker arm assembly thinking that maybe the one that was in there had failed, but not it.

[@dashfax]

Having same issue

[@NotThePulla]

@@dashfax so i ended up going back to .003i .004e I heard enough other scooters on KZbin and whatnot that once they put the BBK on it had the same tapping, i was just being paranoid. As long as it doesn’t get loose it stayed running fine

[@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

[@killerdemocrate1]

Hey where do I get a new valve ajustment screw with or without the nut the nut won't ajust far enough down nor come all the way up and off screw .

[@legoironmanstudios7231]

Great video. I have a question. I tapped for larger exhaust studs but I went through the wall. Will I need to replace the head? The new studs hold the exhaust fine but I didn't know if it would cause leaks. Thanks

[@haydenalberes6599]

Lego IronMan Studios I would definitely suggest a new head and while you at it might as well get a big bore kit

[@legoironmanstudios7231]

@@haydenalberes6599 thanks

[@trdfgaming7664]

Is this for all cams?

[@sycodad4483]

I adjusted mine when I put a big bore 72cc and a9 cam in. slight ticking. Took the valve cover off and readjusted them. Then checked them. Still has a quiet tick. Runs good. Normal?

[@RollingWrench]

They do tick a little. Hard to say if it’s normal since I can’t personally hear it

[@jeanrossell8129]

nono is a 4 stroke how you now that the piston is top dead center

[@jasonharrington218]

Bike is new doing my first valve adjustment and intake says 0.05 outtake says 0.08 is this ok

[@Yakplanet_tv]

What feeler gauge I need to use to 64mm. What's the adjustments.

[@faberaksel768]

gy6 50mm piston, how many mm is it? intake 10mm exhaust 13mm??

[@ididitmyself3837]

that 0.004 and .005, is it inch?

[@yassinefreeman8161]

does this work on kymco trend movie 125cc ? thx

[@jeffquinones4007]

Is the same for a 100c full kit installed? Shops told me 0.08 for both

[@claudio67362]

Yes,0.08 mm,not inches,that is a good valve clearance.He is using thounsand of an inch.He is the U.S

[@MrJudestarnault]

I don't have the feeler tool but I know copy paper is 0.04 inches thick, any reason why I shouldn't use that instead.

[@RollingWrench]

I suppose that would work :-)

[@MrJudestarnault]

@@RollingWrench thx I wasn't expecting an answer that fast.

[@cemtkeenan2750]

I dont believe this would work, paper is compressible and likely would not give accurate reading as solid metal. Also, quality control in a paper mill is much less strict than in a metal fabricator.

[@MrJudestarnault]

@@cemtkeenan2750 after seeing how cheap was the proper tool I went with that. As a last resort I would use a sheet of paper but I would get it from the industrial printer my boss deals with for signage and marketting. I guarantee they know exactly how thick their paper is

[@michaelkoldig2558]

Is it the sam with 125cc gyy when checking where the T haves to be for timing with the top wheel with chain?

[@michaelkoldig2558]

gy6 125

[@RollingWrench]

It’s the same

[@michaelkoldig2558]

@@RollingWrench Does the 125cc electric starter have enough power to start a 160cc cylinder when now i got a 10 amp battery on

[@michaelkoldig2558]

i think ti believe that gy6 125 and 150cc starters are the same

[@RollingWrench]

michael koldig yes it will have enough power

[@kevingillette5942]

No help at all wat size feeler gauge

[@RollingWrench]

Maybe you need to go back. It’s in the video.

[@Del-West-Watson]

Is this the same on a 250cc?

[@miguelzavalza6645]

Do you lock tite the tapets

[@RollingWrench]

No

[@shannon5459]

Where did you get your engine stand?

[@RollingWrench]

www.rollingwrenchdenver.com/products/gy6-engine-work-stand?_pos=1&_sid=49c08ba02&_ss=r&variant=44116714062053

[@Jflames23]

My question is did you have to take everything off to do this ?

[@cemtkeenan2750]

Should be just the valve cover, but may have to remove the plastic side cover

[@pujo28]

Do you have to drain the oil first?

[@JonOfRiverFalls]

Nope!

[@frankj4u]

Where do I buy the tool?

[@johnpaolodeguzman1605]

Hi @Rolling Wrench what valve clearance can you recommend to set for an a12 cam with 58.5 bore. Hope you notice this TIA :)

[@RollingWrench]

.004

[@julianarodriguez3635]

How can I order the engine stan

[@marcusriley4105]

I was told to rotate the valves till one was down and the other one was up and adjust them like that

[@RollingWrench]

+marcus riley No that doesn’t seem right. Follow the video to get it done correctly .

[@dalejohnson9473]

No

[@ryanoneil3316]

I have a 200cc and that chain keeps jumping off sprocket any suggestions

[@greatcesarsghost]

I assume you mean the rear chain or the chain in side where the valves are ??

[@ryanoneil3316]

The valve chain

[@orangestoneface]

l thought no need to find t mark any place on cam that is not on lobe is good to use, beer or soda can aluminium is near right thickness can use a piece of it instead of feelger gauge.

[@PaumotoRacing]

What brand of brake shoe do you use?

[@ruddyrabe]

Is that flat tool a must or can i use alternatives since is kinda hard for me to get it?

[@ruddyrabe]

nevermind just got one on amazon :)

[@turtleperks6909]

Mine has a f mark?

[@GY6SCOOTERCHAT]

You mention the emission plugs are on the website, then not put the website in the description

[@RollingWrench]

www.rollingwrenchdenver.com/products/gy6-pair-valve-valve-block-off-plate?ToPasteboard

[@jacobtucker6819]

What size engine is that

[@RollingWrench]

171

[@carljonathansaavedra2724]

Thank You Bro. Hahaha All the way From Phillipines.

[@vidolf3497]

Okay so I've adjusted my valves like this and all but when I rev it it dies instantly, anybody know what it might be? It's not the carburetor cus it's brand new. Pls help

[@RollingWrench]

Back track. Find out when it started doing it -and address what is going down. Also just because the carburetor is new doesn’t mean that’s not your issue

[@vidolf3497]

@@RollingWrench its just stood still without getting started for like the last 2-3 years. now I've adjusted how much fuel it gets and it started working but then it just died again and now it doesn't start at all😭😭

[@vidolf3497]

@@RollingWrench it's barely been driven for 10 hours

[@vidolf3497]

@@RollingWrench and it worked just fine when I put it away

[@ImSrry4BeingWhite]

​@@vidolf3497did you ever figure out the issue? Mine does the same!

[@chrislavalley4062]

.4 on in and ex?

[@RollingWrench]

Yea

[@armdrop101]

Same lash with a9 cam .

[@RollingWrench]

Ya

[@adrianscoggin7212]

So is it .004 on both the intake valve and the exhaust valve? Also are these measurements the correct ones for a 150cc and not just a 50cc? I upgraded recently.

[@ultraflightamerica9019]

kinda makes me wonder if anyone makes a roller rocker setup for these; knowing full well it is probably pointless.

[@michaelarmajo4572]

Thank you so much it saved me... Thank you...

[@idahoduckhunter]

Thank you very much

[@genevabarrio2671]

My 139qmb wont start

[@liviumititelu7397]

.004 is like 0.010mm

[@carlkennedy2499]

I thort you are ment to set the flywheel at i not t 😮

[@jasperdomacena6491]

3:19 wicked ticking rockerarm noise

[@jasperdomacena6491]

GY6 engines has this incredibly simple cylinder head adjusting the exhaust valve on a pitbike engine is a pain in the ass because it is underneath and it is inside a closure unlike the GY6's cylinder head the rockerarms are exposed and have more room to work on

[@jani557]

awesome

[@scottpetersen6869]

You completely forgot the exhaust valve with .007 feeler gage fix the video half a video sux

[@williambaker2547]

lol way off straight

[@joeycottontailakajoeschmo3366]

And now your ready to break down in front of a fully loaded tractor trailer going 70 mph

[@RollingWrench]

Why would you brake down?

[@joeycottontailakajoeschmo3366]

Made in China. People driving these are road hazards and should be draped in flashing neon lights.

[@RollingWrench]

These motors are absolutely bullet proof! They are made in China. Unlike most things in China, these are really reliable 🤘🏻. Do you own one? Or just browsing vids?

[@joeycottontailakajoeschmo3366]

Bwahaha you said bulletproof,made in China and reliable in three consecutive sentences. Just passing through because a buddy bought one of these turdsicles and it has less than 1k miles and it's needed soooo much work it's unbelievable. He pushed it home again yesterday.

[@RollingWrench]

Joey Cottontail aka joe schmo I do this everyday, for 18 years now. These motors are strong 💪. I think your friend is pushing it home because everything else around the motor. But if we are talking about the motor itself, they are bulletproof. Just a little education since you maybe miss informed. This is the most popular Honda Ruckus motor swap motor for a reason.

[@markduffy2536]

I have a TGB F409 150cc can you tell me what to set the intake and exhaust to please, currently at 4int and 5exst and it runs terrble when you throttle it, can you help matey