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Old 03-24-2014, 05:12 PM
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MotorBicycleRacing MotorBicycleRacing is offline
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Join Date: Jul 2010
Location: SoCal, Orange County.
Posts: 5,356

Originally Posted by fischer550 View Post
OK, so I have just decided to make sure so I took the head off, so now what do I measure to determine the displacement?
You do not need to remove the head to tell the engine size.
Does your motor have 6mm or 8 mm head studs?
If they are 8mm it is a 66cc
48cc have flat top pistons while 66cc are domed.
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