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50cc chinese 2 stroke scooter wont run after it warms up

If cold, starts and idles fine. It will idle indefinitely, but once you take off it runs for about a city block and then dies and won't re-start. If it sits until completely cold, starts fine and same thing will happen when you try to ride it. I have installed a new carb, new plug (plug is not wet and perfectly tan), cleaned air cleaner, check vacuum valve on the tank. I'm stumped!

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  • Master
  • 10,291 Answers

It's possible there is excessive wear on the piston rings.

Posted on Aug 13, 2017

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Posted on Jan 02, 2017

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SOURCE: 50cc Two Stroke Scooter Engine - Poor Idle

I had the same problem- from out of nowhere the scooter started dying at every stop. I adjusted the idle screw to 2000 and it still idled up and down. I bought some injector cleaner but this will take a while to work (several tanks of gas) and then found this link- seems to be a very simple thing to do once you read this link. I hope it helps. --

Posted on May 19, 2009

BTK127
  • 9 Answers

SOURCE: engine dies after it warms up good.

in the bottom of your carburator there shoud be a little plastics pieceand usualy it gets in the way of the float i take them out of carburtors all the time and usually it block the float so it floods out the motor i just found a picture on google of something like it. try taking that out and put ur carb back together like thatee760e91.jpg

Posted on Sep 10, 2009

  • 43 Answers

SOURCE: I have a 150xcc scooter, water cooled,4 stroke

sometimes tight valve lash clearance will cause problems. Low compression?

Posted on Dec 31, 2009

  • 1 Answer

SOURCE: Fuel Problem? I have an 8N that starts and

if you find the answer please e-mail me i have the same problem with my jubilee i've not been able to work on mine due to some fuel tank problems my e-mail is ky.hammer@hotmail.com thanks

Posted on Jul 05, 2010

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1 Answer

TaoTao 50 will not idle


Hi, Misty you need to make sure you have no intake leaks by spraying some Brake Kleen, Contact Cleaner, Starting Fluid etc. around the intake manifold and seals, if the RPM's go up or down significantly then you have a leak that needs to be fixed before you can continue with the carburetor adjustment.
The engine should be at operating temperature with the choke off to set the idle between 950-1050 rpm. Turn the idle skrew clockwise to increase the idle speed and counterclockwise to decrease the idle speed. If you have access to your air-fuel mixture skrew you may turn it as well, if not there is a video below on how to gain access, make sure you start with clean or new spark plugs. Gently turn the air-fuel mixture skrew clockwise until it starts to bottom out "STOP" do not over tighten as it will damage the taper on the end, now back the skrew out 1-1/2 full turns to establish a starting point start the engine and check the idle rpm's and turn the idle skrew accordingly for 950-1050 rpm if necessary, turn the air-fuel mixture skrew 1/4 turn at a time and let the engine settle for about 10 seconds, turn the skrew clockwise for a leaner mixture and counterclockwise for a richer mixture, you are seeking the highest rpm your air-fuel mixture skrew can acquire without going past 3 full turns from the bottom then resetting the idle skrew back down to 950-1050 rpm If you can not detect any rpm change and can not stall the engine by turning the air-fuel mixture skrew all the way in then your pilot/low-speed jet is too big and needs to be replaced with the next size smaller. Final adjustment should be made with a clean air filter mounted to the carburetor.
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50cc Two Stroke Scooter Engine - Poor Idle


I had the same problem- from out of nowhere the scooter started dying at every stop. I adjusted the idle screw to 2000 and it still idled up and down. I bought some injector cleaner but this will take a while to work (several tanks of gas) and then found this link- seems to be a very simple thing to do once you read this link. I hope it helps. --

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