50cc Chinese Scooter - Bogs down at Full Throttle

Roscoe · 05-12-2017, 07:53 AM

What I'm thinking, ... sounds like a fuel problem, possibly sediment in the bottom of the carb was disturbed when changing the carb from one to another and wound up in the jets. Also check your vacuum lines, vacuum is highest at idle and will open the petcock, I suppose at wide open throttle you might be losing enough vacuum to allow the petcock to close and shut off the fuel. ... Final thought, a failing ignition system, when it's just right (or wrong?) can mimic fuel problems. Unusual but I've had it happen. Let us know what you find and how you fixed it.

05-12-2017, 07:53 AM	#2
Roscoe Join Date: Nov 2016 Location: N. of Texas and S. of Kansas Posts: 252	What I'm thinking, ... sounds like a fuel problem, possibly sediment in the bottom of the carb was disturbed when changing the carb from one to another and wound up in the jets. Also check your vacuum lines, vacuum is highest at idle and will open the petcock, I suppose at wide open throttle you might be losing enough vacuum to allow the petcock to close and shut off the fuel. ... Final thought, a failing ignition system, when it's just right (or wrong?) can mimic fuel problems. Unusual but I've had it happen. Let us know what you find and how you fixed it.
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