Ghost racer 7g huasheng 49cc 4 stroke transmission- gearing help

Dylan Lee

New Member
Jul 10, 2019
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20190807_154133.jpg I get 24 mph on flat ground, no pedal assist, full throttle.

i want to keep my power, and go faster. Should i replace the 10 tooth trans gear for a 12 tooth?

I have the centrifugal clutch (belt drive) going to a 109 tooth rear trans gear, directed to a 10 tooth gear that pulls the stock 44 tooth rear sprocket.

How can I change some gear sizes to go faster while keeping my power?

I'm planning on getting a 41 tooth rear sprocket soon.
 

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Dylan Lee

New Member
Jul 10, 2019
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I thought about it more, changing the 10 tooth to a 12t would slightly reduce power, but give me roughly extra 3mph top end.
I'm gonna get a better exhaust or make one. And a better carb.
Those two should cover the power loss.
But I dont know enough about 4 stroke carburetors, and what to get.

Dylan lee
 

Venice Motor Bikes

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I thought about it more, changing the 10 tooth to a 12t would slightly reduce power, but give me roughly extra 3mph top end.
I'm gonna get a better exhaust or make one. And a better carb.
Those two should cover the power loss.
But I dont know enough about 4 stroke carburetors, and what to get.

Dylan lee

Actually, reducing the rear sprocket by three teeth will give you about three more MPH.

Gasbike sells a 2-stroke carb & manifold kit for your engine, & you can also modify a 2-stroke exhaust to fit your engine.
 
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