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Old 08-30-2015, 11:17 AM
crassius crassius is offline
Motorized Bicycle Elite Member
Join Date: Sep 2012
Location: USA
Posts: 2,783
Default Re: 80cc bike really slow

many sellers are offering cheap kits now that may be older than the most recent kits

some have un-balanced cranks and some have polished cylinders

these motors may take between 60 and 100 miles to run in enough to develop full power - often, the carbs on these are very rich also, so that dropping the needle to a leaner position can help a little on hills
Sometimes I sets and thinks, sometimes I jes sets.
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