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Thanks in advance

I have two questions here is the first 

im gonna use a xr75 cylinder bore out up to 57mm on crf80 

Im gonna have to cut the timing chain the ratio 2 -1 will change ?? 

 

And im building a xr100 im gonna put 54mm stroke crankshaft with 58mm piston im going use longer timing chain  and im going use 9mm spacer on the cylinder.  The ratio 2-1 will change also ?? 

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No matter the length of the cam chain or number of links,

it's the number of teeth on the crank gear and cam sprocket that determines the ratio.

 

The cam sprocket always having double the number of teeth than the crank gear.

Edited by mlatour
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