Gear ratio for chainsaw bike

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kidgambit

New Member
May 2, 2012
58
0
0
washington
Someone told me gear ratio is important toward speed. Im using a 36cc chainsaw and the tire has a 18 tooth sprocket. What is the right number sprocket do I need on the chainsaw. Please help
 

Theon

New Member
Jan 20, 2014
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FNQ Australia
I don't think its possible with 18t on rear wheel.
China Girl is twice the displacement, has 1-4 on the clutch, then 1-4 on the final drive, giving 1-16.
So you would be looking for a single tooth front sprocket?
 

maniac57

Old, Fat, and still faster than you
Oct 8, 2011
4,484
22
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memphis Tn
No. You will need much lower gearing to run a direct drive chainsaw. 15tooth drive to 70 tooth wheel or more might get you in the ballpark.
Chainsaws need rpm to make power and all you will do right now is smoke clutches and make noise.
 

Theon

New Member
Jan 20, 2014
1,440
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FNQ Australia
Sorry Maniac, But I don't think that will even be close.
I was thinking my pocket bikes run a 6 or 7tt to 68t with an 11" OD wheel.
So if you were running a 20" wheel you'd want to go 6t to 150t? sprocket.
Or run a jackshaft, on my tadpole, I was going to run a 49cc pocket bike motor with a reduction box to a jackshaft to a final drive chain to a nexus 3 speed hub to get the right gearing for a 20" wheel.