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Old 03-25-2014, 11:15 AM
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mapbike mapbike is offline
Motorized Bicycle Elite Member
Join Date: Mar 2010
Location: Central Texas
Posts: 5,379
Default Re: How to tell the difference between 49 and 66cc?

I have an old 2009 model 66cc engine that has 6mm studs 47mm bore and also has a smaller bolt pattern for jug/head, it also has a flat top piston and a straight plug head that has a much smaller combustion chamber, it was a Boygofast motor that was labeled as a Red Bat Engine, probably not to many of those still out there but it is an odd ball compared to the 66cc engine we have now, it has been an excellent engine as far as longevity, but it will vibrate your socks off at higher

Measure the bore and you'll know 100% what you have but most likely if it has 6mm studs it is likely to be a 49cc and 8mm being most likelya 66c, qgain measuring the bore is the best way to be certain.

I dont always ride WOT, but when I do..I do my best to keep the rubber side down..Ride safely my friends!

Last edited by mapbike; 03-25-2014 at 11:18 AM.
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