Scooter Fuel Vacuum Petcock Problem and Workaround

I was having trouble getting my scooter started after it had been sitting a while, and a very helpful comment in my "Scooter Cold Start Struggles" pointed out that the problem may lie with a vacuum petcock in the fuel system which doesn't get sufficient vacuum during start attempts to open.
In this video, I track down the problem, and replace the vacuum petcock with a manual valve system which will hopefully avoid this issue in the future. Many thanks to Steve Randall for the comment on the vacuum petcock.
Here's the link to the Scooter Cold Start video if you're interested: • Scooter Cold Start Str...

[@ralphcon1]

This worked for me. I don't ride my scooter that often. It sits for weeks at a time and won't start. I keep replacing the vacuum petcock. I did the mod exactly as you did yours and bam, starts and runs fine every time now. No more vacuum fuel pumps for me. Thank you for posting this.

[@jt8251]

Excellent solution, my friend! I have a 1981 Honda SR50 with the same dilemma. The autocock gets stuck shut when fuel sits in there for a long time. I was able to get the autocock to work again by hitting it with compressed air, which popped the diaphragm loose again, but to avoid future issues, I'm going this route. Very smart.

[@TheAfterWorkGarage]

Thanks, I hope it works out for you!

[@penas111ify]

That's what I'm looking for, have the exact issue on 2 scooters. I ran the most intact one straight from the tank and boom fixed, now just need to get a petcock so i can stop the flow when I'm not out riding. Thanks for such a in depth video

[@TheAfterWorkGarage]

Thanks for the feedback! I'm glad the video helped. I'm really glad someone left a comment on my earlier video and let me know of this issue, it has completely solved my starting problems as well.

[@dapv144]

Or a manual fuel shut off valve if its easier.

[@williefrazer2204]

@@TheAfterWorkGarage p

[@sihanson6200]

This finally solved the problem I was having! Thank you!

[@jasonburks8010]

Great job explaining how everything works - Thanks!

[@johnschiffer3756]

Darn Good explanation. A. Not wordy, C. Not wordy, C. The entire "petcock" idea/philosophy is covered, still- NOT wordy. EXCELLENT. I speak in the name of the 21 cen Movements of the 21st Century, like a faster earth for longer cognizant , knit picken thing.., and no stupid. Excellent, Praise The Higher and you.

[@TheAfterWorkGarage]

Thank you for the kind words!

[@salvadorlopez-beltran6734]

Tripped me out bro , i was only listening to your video while working on my bike and I had to get up to play it again and got stuck for 30 trying to find the video again I passed yours 4 times before I actually played it and it was a eureka moment, I can say the face and voice matching threw me off lol. Thank you this helped me so much

[@TheAfterWorkGarage]

Lol, surprise. Glad it was helpful!

[@user-li2lq4xk4v]

Well explained and awesome presentation. Thanks a thousands!

[@TheAfterWorkGarage]

Thank you!

[@scruffyleon7383]

I have that problem. Now I know a solution thanks to you.

[@bgs722]

Great video. I am having the exact same problem. I purchased a new petcock and your shut off valve solution. I hope one of the options works. Also.. Rock Chalk! Nice shirt!

[@TheAfterWorkGarage]

Hi Bryan, I hope your new parts fixed your problem, and thanks for the shout out to the Jayhawks!

[@philmore4801]

Great I was wondering why it took a century to start especialy in cold weather you saved my scooter from garbage :)

[@TheAfterWorkGarage]

Glad it was helpful!

[@riadhch5643]

Thank you my friend it was a good video I really did enjoied it

[@TheAfterWorkGarage]

Thank you!

[@51Happy69]

Thanks for your great video. I am going to do the same thing to my 2007 Yamaha 125 Vino! It has set for a couple of years and I am having trouble starting it. I found the fuel vacumn valve and took it off and tried to take it apart to check the diaphram. I couldn’t take the valve apart after removing the 4 screws but now the valve is stuck open after I messed with trying to split the valve! SOOOO! I am doing your fix and will put in an on/off valve and cork the vacumn line. Ha!

[@TheAfterWorkGarage]

Awesome, I hope it works out for you!

[@chowmurphy]

I had the same problem thanks for the fix, the way I found out was when I would ride at full throttle and my scooter would cut out after a while because the fuel flow could not keep up. Thanks again

[@TheAfterWorkGarage]

Thanks for sharing. It makes sense that there would be insufficient vacuum at WOT to open the petcock.

[@kunjidee]

Oh cool thx for showing how to remove the plastic and gas tank.

[@TheAfterWorkGarage]

No problem! Glad it was helpful!

[@arthurtrahan2696]

Great video. I have the exact same scooter as you and am having the same issue. Not really mechanically inclined and nobody works on scooters near me so been trying to figure it out on my own. This seems as if it could be a main part of my problem. I actually had it running and was ready to run to town and it died again...lol Hopefully this will help, keep up the good work. Looking forward to more videos

[@TheAfterWorkGarage]

Thanks, and I hope you got your scooter issue worked out!

[@shaneannibal6284]

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[@shaneannibal6284]

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[@aaaa1953]

Nice modification to bypass the vacuum petcock.

[@tonyconnors1342]

Really helpful many thanks.

[@TheAfterWorkGarage]

Glad it was helpful!

[@josephmiddleton8754]

Great video mate, very very helpful.

[@oscarfernando1442]

I have Vespa lx50 that is hard to start after seating for a few days this is the solution. Thanks good job.

[@TheAfterWorkGarage]

Good luck! hopefully it's an easy fix for you. Vespas are great scooters.

[@edwardchavezjr796]

Where did you purchase the peacocks and what size for hose lines?

[@user-vo4dl7ps6g]

Great stuff 😊

[@Fred6ERIC]

Thank you, i'll try! My Peugeot Sum Up 125 won't start, the intake manifold don't aspire, maybe with this solution, they will work. Thank you, good job!

[@TheAfterWorkGarage]

Good luck, hope it works for you

[@Fred6ERIC]

@@TheAfterWorkGarage nope... Now, i will try to adjust the valves...

[@TheAfterWorkGarage]

@@Fred6ERIC ugh that's frustrating. If you can narrow it down to either spark, fuel, or air as being your problem, that could save you some hunting. Check for vacuum leaks and make sure you are getting fuel in the carburetor. It might also be worth checking the auto-enricher which many scooters have in place of a traditional choke. If that's not working, then it'll be hard to start.

[@Fred6ERIC]

@@TheAfterWorkGarage i put a new carburetor, i change the petcock for a fuel tap. There's a spark. When i try with Startpilot, the motor start for 5 seconds and stop... that's why I suspect a misadjustment of the valves. What do you thing?

[@TheAfterWorkGarage]

@@Fred6ERIC If there's a ton of miles on the scooter, then possibly. It's certainly worth checking with a feeler gauge. My first thought would be a vacuum leak letting too much air in. Will the scooter start on starting fluid? It can't hurt to double check your vacuum lines and all their connections, as well as make sure all the connections to the carb are secure. an enricher valve has an electrical connector, so don't forget that one if it's there. If it's easy to pull the timing cover, it might be worth checking that to make sure it's in time as well. Keep eliminating one thing after another and you'll get there eventually. I just like to check the easy to get to things first. Also make sure that neither of the kill switches are engaged (though if you're sure you have spark at the spark plug, they aren't). When you find the issue do share, I'm curious!

[@johnhicks735]

Good 👍 job man.

[@rajeshkumar-ob4fr]

Good work

[@TheAfterWorkGarage]

Thanks!

[@walthercasalini3204]

formidabile grande soluzione.

[@MrBerenguer67]

Thks four your excellent video I have a Peugeot v clic is start today spilling gasoline through the tank breather whitch reason thank you so much

[@bgpautomotive]

Can you elaborate more on the anti-theft thing that you had to unplug when removing the seat and compartment? I bought a scooter similar to yours, but I don't know what to look for with regard to a plug going to the seat. I have an empty plug not connected to anything which perhaps I will need to short to get the scooter to start?

[@mgkeoh]

Great video. On plugging the vacuum. Line; you can buy a set of plastic bungs that would fit the hose. Or go all the way back to the carb and put a rubber cap on it. I did that same job on a few scooters. I hate those vacuum petcocks.

[@TheAfterWorkGarage]

Thanks for the info - I definitely need to stock up on those little caps and plugs, there's always some use for them.

[@martinparker9249]

a golf tee works well or any tapered bung,.....hell even a cut down six inch nail lol

[@dariuscornelius5883]

Hey where could I order the two fuel pieces that you replaced on the gas tank?

[@caduceus33]

This looks like a great idea that I can use with my new-to-me 50 cc scooter! I think a fitting without a petcock at the tank would be sufficient, if I can find such a thing, and only have the petcock that you installed in the middle of the line.

[@TheAfterWorkGarage]

Good thought. I put one there since it was easy and relatively cheap to replace the vacuum petcock with a manual one. I also liked the idea that I could shut off the gas at the tank in the event of a leak, but with such a small tank, I think this is less of a concern. I'd be interested to see what you find if you do get a through fitting for the gas tank.

[@caduceus33]

@@TheAfterWorkGarage Actually, I have been thinking there may be a way to modify the vacuum valve so the fuel will flow through as though it were just a straight pipe.

[@michaeledwards8425]

I have a 150cc scooter that just stated having problems.It only has 2k miles on the engine. My problem is that when you are going down the road it wants to bog down when you give a little gas or when you are just going.

[@mikecuev820]

@@michaeledwards8425 trash in the main jet of the carburetor

[@MsTalkintina]

How did you apply suction to the Vacuum Petcock?

[@johnhicks735]

You can also use wooden dail rod to block off the vacuum line with.,or A carburetor line cap like on older vehicles that are carburetorated to. Then you should be good to go.

[@edwardjames6070]

I enjoyed your video.

[@TheAfterWorkGarage]

Thank you so much!

[@cricci03]

What size is the petcock and where did you get it thanks

[@_li1.loc3_8]

if i cover the overflow valve with the vacuum line will it run fine or do i need the open air from the overflow into the carb theres only 1 port on the carburetor

[@JQUICK21]

I need to learn which vacuum lines can be eliminated and which must be hooked up? Bought a new carb, did away with OEM petcock and now have a fuel on/off switch. I'm confused as hell with the vacuum lines.

[@bsmith6175]

Thanks for the video I think this will solve a similar problem I am having. Where did you get the shut off valve you mounted to the tank?

[@TheAfterWorkGarage]

Hi, thanks for the comment. Here's the link to the petcock I ordered: www.amazon.com/gp/product/B00XVS3FXW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 There are others out there that will work, that's just the one I used. Hope it helps!

[@hunterchung7070]

My SYM carburetor scooter over half year that engine does not working in Taiwan! Due to my fuel tank located within under SYM scooter pedal, and I try to push scooter start motor switch and then I got some situations as below: (1) engine cylinder pressure is 126psi (2) spark plug has flash (3) fuel tank is not pushing gasoline through the fuel filter out? It seems my scooter fuel line system has block issue, could you offer some suggestions to help me fix my breakdown scooter here, thanks!

[@shaunaromine3709]

I have two scooters. 2008 Jonway scooters. I'm not the first owner. On one, there is a petcock with only two heads. I can see down by the tire that there is a line hanging down. I can't attach it to the petcock since there are already two lines going there. It has been like this since like 2016 but I just noticed it. The scooters have sat for a while. I fixed everything possible by KZbin and they are running well now. What do I do about the petcock, the two only heads and the hanging line?

[@noweare1]

Very clear and well presented video. Trying to troubleshoot my moped and it just turns over without starting. I get a small amount of gas thru the petcock, probably because the vac is low when starting. Will having a manual petcock send too much gas to the carburetor ? I would think the vac actually meters the gas in a way. I am not very good a gas engines btw : ) EDIT: Never mind, just read your reply about "flooding" on another comment : )

[@TheAfterWorkGarage]

Thanks for the comment, and yes, assuming the carburetor float needle is seating correctly, you shouldn't have issues with flooding. It would be recommended to turn off the gas at either the tank or line when storing for long periods however. Good luck with your scooter, it sounds like it may just be a fuel issue - hopefully it's not too much to get going!

[@johnpower8356]

Just did this to a roughhouse 50, didn’t like starting after sitting, same fix with a m14x1.0 Manuel petcock and a remote fuel shutoff but I capped the vacuum line nipple with a cap on the intake manifold and removed the vacuum hose

[@TheAfterWorkGarage]

Awesome, thanks for sharing. Sounds like you did the vacuum block off right!

[@shawncardin4352]

I got a r50 with the same issue...thank you!!!life saver!!!

[@mmwwuuaahh]

very nice vid

[@TheAfterWorkGarage]

Thanks!

[@kevinchamberlain7928]

Myself and another PX owner both found our fuel cap breather to be blocked solid. It results in fuel starvation.

[@congoparrot]

i need to do this. can you link the two valves you bought please!!

[@graybeard9802]

where do i buy the valve or what is the thread pitch

[@craigfothergill1804]

I've got a sinnis hero 125 it won't start because the fuel can't get threw from front fuel tank how do you clean the fuel injecter valve

[@BrianMDIY]

Do you have a part number for the petcock you installed? I'm looking to do the same thing to my Lance Soho 50. The tanks look identical. I assume the same petcock would work. I'd like the part number or link to purchase on Amazon. Appreciate you taking the time to make this tutorial. Thanks.

[@TheAfterWorkGarage]

The petcocks I used are as follows: At the tank - 16mm x 1.5mm Fuel Shut Off Valve (ASIN B00XVS3FXW) www.amazon.com/gp/product/B00XVS3FXW/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 In line shut off - 07-403 Inline Fuel Shut Off 1/4" Ball Valve (ASIN B0018U234W) www.amazon.com/gp/product/B0018U234W/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 Hope it helps!

[@BrianMDIY]

@@TheAfterWorkGarage That does help a lot. Thank you.

[@cathyvermeulen9663]

Liked you video! I have a question about my 2008 zhong scooter. I drained the old fuel since it was sitting for awhile. I didn't have any shut off valve, so I had to take the piece you replaced off to drain the gas. Once I got fresh gas in it started. However now when rotate the handle bar to give it gas, I have gas coming out an open ended valve (it doesn't connect to anything, and has a really nice slanted edging to it? I could show you a pic but I can't add it to this?

[@TheAfterWorkGarage]

Hi Cathy, it's hard to say, it may be coming out a vacuum hose, or it's possible the float needle in your carb that shuts off the fuel valve when the carb bowl is full is leaking and letting gas out of a breather hose. Do you know what the place where the gas is coming out of is connected to?

[@cathyvermeulen9663]

@@TheAfterWorkGarage its not connected to anything. Thats the weird thing. Its an open ended hose with a nice beveled edge to the hose. I sent a couple pics to your Facebook messenger.

[@insanechevy91]

You are awsome man going to try fixing my scooter i just got on fb for 100$ dosent run 2008 gator 50cc

[@TheAfterWorkGarage]

Good luck! I hope it is an easy fix for you. If it is, sounds like you got a good deal!

[@KyleCorfman-io1zr]

What is the part you ordered?

[@hotcakes5622]

HELP! What part is that so I can order? what valve thanks

[@MsTalkintina]

Do you still read comments on this video?

[@codyeickberg2523]

Great video! I’m having some similar issues on my Bintelli Sprint. It’s very hard to start, most of the time I need starting fluid to get it started. When I do get it started and drive it, it bogs done and does not go nearly as fast as it should. I’ve cleaned the carb and jets, new plug, drained the fuel out of the tank, cleaned all the lines. I’m wondering if this is a vacuum petcock issue.

[@TheAfterWorkGarage]

Once it's going, it should have enough vacuum to keep the petcock open. Make sure you check for vacuum leaks, which could cause lean running, but also cause issues sustaining vacuum pressure to the petcock. At the very least it couldn't hurt to make sure all of your vacuum lines are tight, and your connection between your carb and head isn't leaking.

[@grubble01]

@@TheAfterWorkGarage hi Andrew I have the same problem with my kymco agility 50. I need to find out where you got that manual fuel tap from.. Help 👍😜

[@TheAfterWorkGarage]

@@grubble01 Good luck with your scooter! The manual shut off valve is here: www.amazon.com/gp/product/B0018U234W/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

[@williamhobbs9112]

That sounds like you are running rich and need to adjust the fuel air mix on the carb.

[@pastorjoesackett]

@@williamhobbs9112 also.. every scooter owner needs to adjust the valves every so often. It sounds difficult but isnt.. you need a feeler gauge, an 8mm socket to remove valve cover, a 9mm socket and small needle nose pliers. Get timing mark on line on compression stroke and set.. recommend 3-4 thousandths on intake and 4-5 on exhaust, for 4 stroke..

[@motododo4626]

Dude your presentation on these videos is great. You manor of how you speak to your audience as well as the enthusiasm is what makes it nice to watch. Alot of people making videos think they can just throw a video up but you have to actually have the attitude to back it. I subscribed bud hope your channel grows.

[@TheAfterWorkGarage]

Thank you so much for your kind words! Hopefully I can get my channel up and running again when I find a shop space closer to where I live!

[@motododo4626]

@@TheAfterWorkGarage hey man all in good time. You take care of life and just do what you can. Too many youtubers let it take over life and thats not healthy.

[@sanansa4567]

i have a new 50cc scooter, in order to get it started I need to just keep trying and trying, and also what helps a little bit is covering the air intake filter. Any ideas on the cause and how I can resolve it? Thank you.

[@TheAfterWorkGarage]

This sounds like it may be a faulty auto-enricher. It's usually used in scooters instead of a choke to let more fuel into the engine when it is cold. Covering the intake a little acts like a choke to pull more fuel out of the carb, which to me suggests that it's an enrichment issue. they are pretty easy to replace (usually just an electrical clip and a screw). I actually had to replace mine, and may have video of it somewhere.

[@aaronbastien9849]

I have a 149cc boom rugged, it starts and idles fine, but when I throttle it to about 15%-20% the back wheel will sometimes spin and sometimes not,then my motor will bog out and shut off. Was wondering if you had any input on what it could be. Great video by the way man.

[@TheAfterWorkGarage]

Thanks for the comment. It sounds like this may be an issue with a dirty or restricted carburetor/fuel supply. As you add more throttle, the mixture leans out and kills the motor. Also make sure that the back wheel turns freely by hand, since a stuck on brake or problem with the final drive gears/system could be causing increased load when the centrifugal clutch engages that is killing out your motor. Hope this helps!

[@KyleCorfman-io1zr]

So what size are the threads on the Chinese scooter gas tank

[@muttalippnarbas9262]

Hello. Are the stalling problems resolved after replacing the intake system fuel cock? Does the engine run more smoothly at idle? Are you satisfied after replacing the fuel tap?

[@TheAfterWorkGarage]

It's worked great so far!

[@muttalippnarbas9262]

@@TheAfterWorkGarage Thank you very much for your reply. Good luck.

[@wesleywebb1058]

Was your scooters rpm gauge spiking during this problem because, mine is and if I remove the vaccum line from petkock it reves up some, I'm trying to see what your trying to accomplish are you doing away with vaccume line?

[@TheAfterWorkGarage]

Hi Wesley, to me that sounds more like a vacuum leak issue. The revs spike when you introduce more air (either through an intermittent leak or by pulling the vacuum hose off) and you lean out the mixture. This increases the revs, but also makes the engine run hotter, so you definitely want to track down where the issue might be. Good luck!

[@rret6885]

thanks for the video. where did you get the new petcock? thanks.

[@TheAfterWorkGarage]

for the in line stop it was: www.amazon.com/gp/product/B0018U234W/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1 The replacement at the tank was: www.amazon.com/gp/product/B00XVS3FXW/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

[@rret6885]

@@TheAfterWorkGarage thank you!

[@benspada3832]

It would be nice if you told us where to get those parts or the part numbers

[@yaboialex2579]

Exaclty

[@mikecuev820]

Hi there, I just installed a new gy6 150cc motor on my scooter and it started fine but the engine seems to be missing while idling. I looked at my clear blue fuel line and from the fuel pump, it seems to be pulling in some air bubbles and I was wondering if that could cause the motor to sound like it's missing. I've already adjusted the idle screw but the motor still misses while idling. Could the air bubbles going into the carburetor be the cause? Thanks for any feedback!

[@TheAfterWorkGarage]

Air getting into the carb from the fuel line isn't going to cause missing, but the fact that you're getting bubbles into your fuel system could be telling of some other type of issue. Are you sure your motor has a fuel pump, or is it gravity fed from the tank like most scooters?

[@dianebenzi3826]

Hi just wondering if you could help me I have a kymco 125 agility scooter. It only runs when the gas tank is full. Once the tank gets on or below 3/4 it sounds like its not getting enough gas and dies when you hit the gas I don't know if its because when the tank is full there is more weight to move the gas out can't find a leak. Any ideas?

[@TheAfterWorkGarage]

Oh boy, I really don't know. If it's 3/4 full and you open the fill cap and try to run it, does it run normally again? The only thing I can think of here is that the fuel tank vent is blocked, so it's drawing a vacuum in the tank as you use fuel. Otherwise, it may be a partial blockage in the fuel lines, and the additional pressure of the fuel in the full tank is enough to force it through. If it's not a vent cap problem, I'd start by tracking down the fuel lines, and make sure there's not a blockage. Oh also check the carb float - if float isn't dropping down all the way or the needle is sticking, it could also cause a restriction.

[@youtuup]

very nice video, I'll something simular. Too bad you didn't show us where the other vacuum cable goes to .. is that one also shut off?

[@TheAfterWorkGarage]

Not sure exactly which line you're looking at, but one is for crankcase ventilation, and then there is also an EGR system for emissions. Some scooters also have extra hoses that aren't vacuum related, like carb bowl drain hoses, and breather hoses.

[@arthurwolfburg6441]

I have the same problem with my scooter. Ordered petcock but will not be in until June. I want to find one of those on off switch you have. Where to get them? Thank you

[@TheAfterWorkGarage]

Glad it helped! Here's the link to the fuel shut off valve I used: www.amazon.com/gp/product/B0018U234W/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

[@ed2335]

What's the difference between the old and new petcock attached to the gas tank? 🤔. Do they operate differently?

[@TheAfterWorkGarage]

The original petcock was vacuum actuated, meaning that it only opens when the engine is pulling a vacuum (turning over at enough speed to create a vacuum). The new one is just a regular manual petcock that you open by turning. In theory I could have just deleted it since I have an inline petcock further down, but it was just as easy/cheap to purchase a manual petcock that was a direct fit, and leave it open all the time.

[@MrBerenguer67]

Thks four your video I have a Peugeot V-Clic 50cc 4 stroke the scooter the idle is constantly up and down all times any help please thank you

[@TheAfterWorkGarage]

If you haven't tried it already, make sure you clean your carb out, and make sure your spark plug is clean/gapped properly. If this doesn't work, check for vacuum leaks.

[@matejjakopovic1818]

I have keeway F-act 2008 125cc scooter, over hot weather, it starts right up and runs supreme. But when cold weather comes, even under 10°C hes hard to start and almost every time I empty my battery whole. Soo I start it with an drill or rope on a fan on magnito and it starts right up. Valves are precise, new fuel, carb cleand, spark excelent. Only thing can be that petcock is also working on vacuume and I didnt try to change it. Do yoh thing there may be other problems too? Pls can you respond u would save me a lot of time and money. P.S. great work and video.

[@TheAfterWorkGarage]

This could very likely be your issue - it's definitely work a try switching it out and seeing if it helps!

[@jayzfordayz7676]

Where did you get the one going from the tank?

[@TheAfterWorkGarage]

The one I used is at this link: www.amazon.com/gp/product/B00XVS3FXW/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

[@paulperrea824]

Fantastic. But I wonder if it introduces a new problem? Possibly "flooding". Just curious. Thanks

[@TheAfterWorkGarage]

As long as the carburetor float and needle valve are working properly, there shouldn't be problems with "flooding." The concern (and reason for the second in-line shutoff) is when the scooter sits for a while, fuel in the carb bowl evaporates out. With a continuously open fuel supply, as the fuel evaporates, more replaces it, and you get an enhanced buildup of varnish/gunk in your carb instead of having the carb bowl go empty.

[@billdell523]

Thank were the air intake valve go on the carb does and the other just close off

[@dnwar6398]

I'm having a problem on my aprilia scooter. When ever I roll on the throttle too quickly it would stutter( like bog) for a sec or two then goes back to normal. It sometimes happens on low throttle also. New carb and new spark plug. Any solution?

[@TheAfterWorkGarage]

Generally these are signs of a dirty cab, but since you say it's new, I would check a few things. First, make sure the new carb is adjusted and actually clean/free of water. Second make sure the booster pump is being correctly actuated by the throttle lever. I'm not sure of the specific design on that scooter, but there's often an arm or follower that actuates the accelerator pump plunger which can get bent our stick so you no longer get an extra shot of gas on quick acceleration. The second thing I would look for is your PCV system (usually a hose coming out of the valve cover) to see if it's completely full of oil. The PCV system leads back to the air box/intake and can cause weird things when it gets a bunch of oil in it. While not specific to your scooter's symptoms, it might be worth checking for things like vacuum leaks, and the electrical connection for the idle air valve (since the carb is new this may have not gotten re-connected). Good luck, and if you figure out the problem, I'd love to hear what it was.

[@islamayman5927]

great work 🔥🔥🔥 but what happen if i don't install a open and closed valve .. fuel can leak from carb ?

[@TheAfterWorkGarage]

If the carb has a leak, it can slowly drain the tank and make a mess. The bigger problem is over time the fuel in the carb will evaporate, and if the fuel from the tank is not shut off, it will continue to refill and evaporate from the carb. This leads to buildup of things that don't evaporate (varnish/dirt/impurities) which will accelerate the need to for a carb cleaning. Overnight, I just leave mine open, but if it's going to sit a while, I like to have the ability to shut it off.

[@islamayman5927]

@@TheAfterWorkGarage okiii .. from your words i can keep it on while night as carb new and no leaks but of i will park scooter for a week or more better to off the valve

[@johnpower8356]

Oh and I might add you’ll be replacing less starters and probably batteries

[@TheAfterWorkGarage]

@@johnpower8356 True story, I recently replaced the battery on this scooter (and should have far earlier).

[@MrBerenguer67]

Thks four your video I have a Piaggio Zip 50 2T when I drive and give a full acceleration is lucking Curt down can you please help me thank you

[@TheAfterWorkGarage]

Hard to say from the brief description, but my only advice would be to check the obvious things like clean your carb (new carb kit etc) and check for restrictions in the fuel system.

[@raymondgoldman9593]

dear, where can i buy such a tap that i can attach to my tank. I have a Fosti Grande Retro, chinese scooter. thank you

[@TheAfterWorkGarage]

This is the one I used at the tank is here: www.amazon.com/gp/product/B00XVS3FXW/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 Though you may need a different threading depending on your tank. The tap I used at the in line is here: www.amazon.com/gp/product/B0018U234W/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

[@gerodallen4490]

I have a 2018 peace sport moped 50cc I just replaced the carburetor and it will start but once going I give it gas it boggs down

[@teenice894]

I love a challenge so finding out why I'm not getting vaccum when hose is connected to carb is paramount. If I suck on vac hose fuel comes out fuel line but not when vac hose is connected to carb. Any suggestions would be appreciated!

[@TheAfterWorkGarage]

These small motors don't make a ton of vacuum to start with, so if the vacuum petcock is stiff or sticks a little, the vacuum from the motor may not be able to overcome it.

[@extremegamer5521]

Will that electrical piece that connects to the seat affect starting

[@TheAfterWorkGarage]

Not 100% sure how it's set up, but most likely if you don't have it connected, it won't start. There's a chance it it's like a kill switch (closed circuit shorts out starting), then it doesn't matter, but I'm guessing it's not that simple. If you don't have yours, and it's not starting, you might try bridging across the two wires to see if it lets it start.

[@kunjidee]

Is that a kymco super 9? I have one. Its been sitting for 6 months. I cleaned the carb. But the gas is stuck. Something somewhere is very clogged. Ugh. So frustrating. I wish i had taken pictures b4 i disconbected everything. I think my scooter hates me.

[@TheAfterWorkGarage]

Scooters can be finicky (well all small motors). It's a Lance Cabo 50 made by SYM. You may have a vacuum petcock issue on your kymco as well - many scooter designs are quite similar. Also that's a nice scooter!

[@teenice894]

I'm wondering if I could run just a line from the fuel tank to the carburetor with no petcock at all, maybe just a shutoff valve in between, since my tank is above my carb.. I take that back as I need something to connect to the tank.. derrrr...

[@TheAfterWorkGarage]

You could do this. I only used the manual petcock at the tank so I could replace it directly without having to modify the tank to attach a hose.

[@BigDsHomestead]

I have a 2012 yamaha zuma with only 900 miles and have gas in oil. Could a fault needle valve, petcock or something else be causing this? It did sit a while without being ridden due to my surgery. It started fine, but once I noticed the fuel in oil, I haven't done anything. I plan on changing oil a few times once I address this issue. Hopefully my engine isn't destroyed. Can't afford $85 an hour to pay someone to fix.

[@TheAfterWorkGarage]

It's possible that an issue with a leaky needle valve/bad float, would cause something like that while sitting, but it would also have have bad vacuum petcock (stuck open) or a manual one that is left open. Alternatively, a broken vacuum petcock diaphragm would allow fuel to leak directly form that pectock into the intake, so you might take a look at that as well. Another place to look for a collection of fuel is the PCV hose/valve (it's a breather hose for the crank case) that probably runs from the timing cover or head to the vacuum system, as that's another rout from your failure point direct to your crankcase if it's not going into the combustion chamber/past the piston rings. Good luck, and I hope all is well with your post-op recovery!

[@BigDsHomestead]

@@TheAfterWorkGarage I wish I could see exactly what you're talking about. Seems like when you need one, a video is almost impossible to find, but once you dont need one, its right there. I am not mechanically inclined. I do, however, own a service manual, which I am hoping is a repair manual. Its intimidating to tear apart something that you know practically nothing about. I'll just have to refer to manual and take my time and hopefully I dont have extra nuts and bolts leftover when I'm done. That would be bad. People on youtube make it look easy. If you find anything online like you mentioned, that may help, could you send me the links? I'll post my progress once I get started and finish. Thanks.

[@roybray8741]

Mine doing same

[@tristantooth3842]

Where do i buy one of the manual petcocks?

[@TheAfterWorkGarage]

This is the one I purchased: www.amazon.com/gp/product/B0018U234W/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

[@xTheJackHDx]

I have a chinese scooter 2015 125cc after like couples hours of driving it it randomly gets bogged down like i can feel it being choked and it doesn't pull like it used to I replaced carb oil filter air filer everything and its still the same any suggestions

[@TheAfterWorkGarage]

A couple of HOURS of driving? That's a long time on a scooter! Hard to say without more info, but it sounds like it could be a heat soaking problem. This usually happens when hot motors sit, however similar things can happen after extended driving, where components get hot and cause poor/inconsistent fuel mixture.

[@frankberens5077]

I have a new Tao Tao 49cc moped and has never never been able to get it to idle, I CONTACTED TAO COMPANY AND was sent a new carb and a diversity different air intake cover which was to correct the problems problems because it's set for California emissions it was to have smaller holes but they are the same, I am now having problems getting it to start it has good spark gap is correct, it acts like fuel not getting to carb.this is scooter is a 2021 TaoTao moped 49cc I have only 3.4 k on the speed o meter I have owned it but never really drove it do to the problems.

[@adamkenny373]

I have a Eton beamer and the petcock and ant getting gas can I soak it in gas to clean it out

[@TheAfterWorkGarage]

Not completely sure what you're saying here. If it is a traditional petcock (not a vacuum one) then best bet is either replacing it, or if it's truly clogged with gunk, maybe a little solvent and some compressed air. I wouldn't recommend solvents on a vacuum petcock, since it may damage the diaphragm. Either way, I would probably just recommend replacement since the parts aren't terribly expensive.

[@daveking1470]

How did you apply vacuum to the vacuum line to test it?

[@TheAfterWorkGarage]

I was hoping no one would ask lol. I sucked on the vacuum line like a straw.

[@daveking1470]

@@TheAfterWorkGarage lol. Time to invest in a vacuum gun. I thought about doing the straw method too!

[@TheAfterWorkGarage]

@@daveking1470 Definitely going on the wish list - somewhere below finding a new shop space in Dallas so I can start making videos again haha!

[@johnathanbryan5053]

@@TheAfterWorkGarage or you can use an air pump from the aquarium aisle in the pets department at Walmart

[@caesarforlife1663]

My tgb doesn't have one.

[@mushmucker]

my 2008 v click runs great but after 10minutes of runnig it stops,then when i start it again it just ticks over and wont rev out,any ideas?

[@TheAfterWorkGarage]

Hard to say without any more info. Does it start again after it sits for a while (like overnight)? After it run and then won't start, see if there is fuel in the carb bowl (loosen the carb drain bolt nut and see if fuel drains out). If it's empty, then you probably have a fuel feed problem. If the scooter has a lot of mile on it, then it could also be a valve adjustment issue. Good luck, and let me know what the issue is when you get it sorted out.

[@ScooterMutter]

you still have a limiter on the carb it looks like

[@insanechevy91]

Whats that do ?

[@ScooterMutter]

@@insanechevy91 Does not let the shiver go all the way up, opening air intake entirely

[@Hubcaps219]

Help! My kymco scooter doesn't fill anymore, the gas just overflows and doesn't go in the actual tank. Can't drive till fixed and nobody knows the problem

[@TheAfterWorkGarage]

Hmm, I'm not familiar with this scooter in particular, but this should be relatively easy to track down. If there is a screen in the filler hole, make sure that isn't blocked up. In addition, if this tank has a breather hose, make sure it's not clogged up as well. If you put gas in it slowly does it go in?

[@Hubcaps219]

@@TheAfterWorkGarage it's at a while with no gas cap and the two was literally full of pine needles from the woods! thanks! cleaned it out and out works great. I did have to clean out and swab the fuel tank just in case they were contaminants that could go into the engine and screw it up.

[@TheAfterWorkGarage]

@@Hubcaps219 That would explain it I suppose lol. I'm glad you found the problem!

[@thedivinecouncil9997]

My scooter starts but only by kickstart and as soon as I rev it cuts off any ideas?

[@TheAfterWorkGarage]

Hmm, hard to say without more information. It could be a vacuum petcock issue, and you are turning it over faster with a kick start than the starter is able to turn it over, and the little gas that comes through is used up/leaned out too much when you try to rev it. If this isn't the issue, I would check fuel supply, and make sure the carb is cleaned and adjusted. Again this would be because a sub optimal fuel/air mixture could allow for some running with a faster kick start (higher compression) than with the starter motor. Good luck, and let us know if you figure out the issue!

[@merjimjimenez1361]

Need help 😭🥺 I have 50cc scooter my carburetor not getting gas I change the fuel filter and hose still nothing

[@TheAfterWorkGarage]

Hi Merjim, this may fix your situation. Otherwise just keep tracking down the fuel system components to see where the blockage is. Good luck!

[@westreid8387]

Hi my moped starts and runs fine but when I’m full throttle for about 15 seconds it will bog out and will come to an stop about 5 mins later I will start it up and will run fine

[@TheAfterWorkGarage]

Hmm, I'm not a moped expert by any stretch, but it could be a fuel feed issue. Definitely check the needle valve and fuel inlet to the carb bowl as well as the vacuum petcock assembly. Could also be a clogged fuel filter. Others may have better suggestion, but that's where I'd start.

[@erminioaliasi6490]

Ok

[@Manwichman]

When I disconnect my fuel line from the carb to the petcock at the petcock, fuel continues to pour out. This is my stall and low idle issue right? I have fuel in the manifold at the motor too

[@wolfpack9889]

Is this on 2 strokes too

[@TheAfterWorkGarage]

I believe 2 strokes would have a similar setup, the vacuum line would just be between the carb and the reed block.

[@bemil4428]

Will this fix when i give my scooter too much gas it shuts off

[@TheAfterWorkGarage]

Not totally sure what you mean there, but it seems like your scooter is dying if you open the throttle? That sounds much more like a carburetor issue causing it to lean out to much and starve the motor. I would recommend a carb clean, and making sure the auto enricher (an electronic component on the side of the carb) and boost pump (part of the carb - it's a little pump that is actuated by the throttle lever) are working correctly.

[@jakesatvrepairandmore1346]

I have a motofino 125cc 4 stoke scooter that doesn't stay running and gas leaks out of the vacuum lines but is also getting gas to gas lines

[@jakesatvrepairandmore1346]

Any help would be great

[@TheAfterWorkGarage]

You may have a leak in the vacuum petcock assembly that is letting fuel into the vacuum lines. Fuel can make its way into the vacuum lines from the carburetor, but that seems less likely. I'd check the vacuum petcock and replace it first and see if that solves your problem. Good Luck!

[@jakesatvrepairandmore1346]

@@TheAfterWorkGarage thx I figured it out it was the fuel petcock ok but now I have another question I have another scooter that's starts and runs good bit the only way to start it is by jumping off the solenoid I've checked everything i know none of the lights works it's like it has no power no horn turn signals etc has a good fuse but you can take the key out of the ignition and it's still stays running keep in mind it is plugged in

[@TheAfterWorkGarage]

@@jakesatvrepairandmore1346 Hard to say with electrical problems. The first thing I'd do is check your ground connections. Often the starter motor will have a dedicated ground, and other things will rely on ground straps to the frame. The next thing I'd definitely check is the ignition (the thing you stick your key into), which could have problems with it as well. Those would be my top guesses, but I'm not a scooter expert.