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Old 07-17-2011, 01:07 PM
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GearNut GearNut is offline
Motorized Bicycle Elite Member
Join Date: Aug 2009
Location: San Diego, Kaliforgnia
Posts: 5,106
Default Re: Engine starting to smoke

All 2-strokes smoke, unless you are running a "smokeless" pre-mix oil.
Piston ring failure will not cause a 2-stroke engine to smoke excessively like it will on a 4-stroke engine.
A 4-stroke engine has an oil sump underneath the piston which is where the excessive oil would come from.
A 2-stroke engine does not have this design. All the oil it gets is from the oil you mix with the gas. That said, if the carburetor is tuned rich or has some sort of failure in it that is causing a rich condition when you are at wider throttle positions ( loose fuel jet?)
then you may notice excessive smoke.
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