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Old 01-02-2016, 09:03 PM
caoboy caoboy is offline
Motorized Bicycle Elite Member
Join Date: Sep 2015
Location: modesto
Posts: 108
Default Re: Engine won't go past 30MPH

I do 30mph (gps verified) and it's plenty fast enough for me. My bro goes a bit faster on the top end...I think about 35mph. These are on new engines, we haven't even fully broken them in yet.

My bike is completely stock with a Sporstman Flyer hub 40T and 29" wheels. I did change the plug wire, but that was because the other was a dud right out of the box. Also an NGK plug.

My bro's bike is stock with a 36T hub, banana pipe, rejetted, new CDI, SBP intake filter, and a bike berry tensioner.

Keef B, are you running a rag joint? One of the things we noticed the most is that going from a rag joint to a hub adapter and sprocket, we have less vibration, smoother acceleration.

Rejetting helps as well as getting the correct fuel mixture. The stock exhaust pipe is better for low/mid range, but I find my bike is lacking up top. My bro's banana pipe helps him pull more top end out of his bike. A proper expansion chamber would be even better.
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