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Old 06-01-2014, 01:22 AM
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Davezilla Davezilla is offline
Motorized Bicycle Elite Member
Join Date: Mar 2014
Location: San Antonio Texas
Posts: 2,710
Default Re: White spark plug.

Sounds like it was surging from being lean and not 4 stroking to me... white with no ash or residue is Way too lean. I'd check the carb to make sure there's no junk in the carb blocking off the main jet because even with a stock jet at 16:1 it shouldn't show that lean.

Surging is when you're cruising along and the engine basically keeps dying and jumping forward from fuel starvation, it usually feels like the engine is cuting out but with a bit of a kick to it as it fires on the next stroke...
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