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Old 03-02-2008, 10:37 AM
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Pablo Pablo is offline
Master Bike Builder & Forum Sponsor
Join Date: Dec 2007
Location: Duvall, WA PNW
Posts: 3,649
Default Re: Motorized Bike Lurching a Bit

These engines are not exactly torque monsters, so when not at the top of high rpm torque curve they will buck a bit. Always happens when breaking them in, but will get better with time.

It's also a matter of plug selection (NGK B5HS and do the wire upgrade), fuel control, fuel oil mixture (IE tuning)

Not sure what part of the country you are from, but when cold the problem is exacerbated. Mine takes farting forever to get warm when ambient is at 50F or below.
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