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Old 04-16-2009, 02:10 AM   #1
Hamsta
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Default LT125 Quad with odd fault

I have an older LT125 kids quad that starts, and runs, well when cold. When warmed up, it starts to rev out with NO throttle. Only way to stop is switch off. Dealer wants nothing to do with it.
I have put on a Brand New Carb and throttle cable. All the inlet manifold is new and sealed correctly. Plug new. Tappets set. Good compression. Not flooding-otherwise would stop.
All points to an air leak when hot-but where? The increase in revs happens under load with a rider on, so has to be substantial. Also this has a vac operated fuel pump if that helps.
Any ideas welcome as have tried all that I can think of.

Last edited by Hamsta : 04-16-2009 at 03:00 AM. Reason: Additional info
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Old 04-16-2009, 06:32 AM   #2
SmokeU
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Quote:
Originally Posted by Hamsta View Post
I have an older LT125 kids quad that starts, and runs, well when cold. When warmed up, it starts to rev out with NO throttle. Only way to stop is switch off. Dealer wants nothing to do with it.
I have put on a Brand New Carb and throttle cable. All the inlet manifold is new and sealed correctly. Plug new. Tappets set. Good compression. Not flooding-otherwise would stop.
All points to an air leak when hot-but where? The increase in revs happens under load with a rider on, so has to be substantial. Also this has a vac operated fuel pump if that helps.
Any ideas welcome as have tried all that I can think of.
Ummmm......atv.com anyone?
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Old 04-16-2009, 06:49 AM   #3
pplassm
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Check timing. Both spark and valve.

Edit: Actually, since it's a fu-kwad, dump it in the nearest blast furnace.
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