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Old 02-20-2015, 07:48 PM
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Greg58 Greg58 is offline
Motorized Bicycle Elite Member
Join Date: May 2011
Location: Newnan,Georgia U.S.A.
Posts: 2,620
Default Re: Curious about the engine, :question:

You need to measure the height from bottom of the skirt to the top of piston pin, 15/16 is a type A , 1 1/16 is a B. Just stand the piston on a flat surface and use a ruller or tape measure, if it less than one inch its an A piston, over its a B.
Your results may not be the same,Greg
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