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.