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Old 03-24-2014, 03:28 AM
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?

49cc more likely will have 6mm head studs, 66 more likely 8mm head studs.
but this may not be a golden rule. there is a slight difference in head stud spacing also, the 66 has 45mm centre to centre head stud spacing, not sure of the 49, but it's less.
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