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Old 03-24-2014, 04:43 PM
Theon Theon is offline
Motorized Bicycle Elite Member
Join Date: Jan 2014
Location: FNQ Australia
Posts: 1,440
Default Re: How to tell the difference between 49 and 66cc?

66cc will have a 47mm piston/bore, 49cc is a 40mm piston.
there is also a 45mm piston, but quite rare.
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