Since a bad reed valve can be the cause of a variety of problems, knowing if
you even have these can be useful - not all 2 stroke engines use reed valves.
|NotTaR of small Gasoline Engines and Rotary Lawn Mowers : Does your 2 stroke engine use reed valve..
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(From: John Barry (firstname.lastname@example.org).)
One easy way to tell is to note where port is behind carburetor. If it just
"dumps" into crankcase, like diametrically opposite cylinder, most likely it's
got a reed-valve. If the passage from the carb connects to the cylinder at a
point closer to the crank center-line than the exhaust port, perpendicular to
cylinder axis and perpendicular to crank, it's mostlikely piston-ported. If
the carb passage is parallel to the crank eventually (starts out perpendicular
on Rotax engines), most likely you have a rotary-valve engine; this is usually
the case for serious specific-output.