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Old 09-15-2017, 08:58 AM   #8
Roscoe   Roscoe is offline
 
Join Date: Nov 2016
Location: N. of Texas and S. of Kansas
Posts: 252
sounds like a vacuum leak and/or a bad carburetor. Might want to also check the valve clearance again and make sure the camshaft timing is spot on. Simplified the carburetor has four modes...cold start, idle, mid-range and power. I'd be checking the cold start enrichment and idle speed/fuel mixture adj. If that doesn't get it running right try cleaning the carb and if that doesn't work ... new carburetors are cheap for GY6s.
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