Qmb139 stroker motor  By  doublec (Read 58 times)

I just did a build on a ice bear 2010 50cc trike. I can't get it over 45. It was quicker with just 50mm big bore kit.

Ssp-g 44m crankshaft
Naraku 52.4 big bore kit
Ssp-g 50mm head
Naraku super transmission
Kevlar belt
17/41 gearing
24mm nibbi carburetor
Nibbi quick throttle
Oil cooler
A9-cam

Can anyone help