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Old 01-04-2016, 12:06 PM
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biknut biknut is offline
Motorized Bicycle Elite Member
Join Date: Sep 2010
Location: Dallas
Posts: 6,280
Default Re: Engine won't go past 30MPH

A 50 mph china girl is going to have a very short lifespan. You need about 5 1/2 to 6 hp to do 50 mph.

After careful tuning and break in, most of my china girls would top out about 35 to 40 mph with a 36T on 26" wheels. They cruise at 30 mph pretty dependably, but riding at 35 vibration takes a toll in short time. 40 mph is a lot worse.

It's not a good idea to turn a bicycle into a motorcycle.
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