22/40 gearing to 20/40 gearing with 70 link chain?

tonesmoke

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the subject says it all.Can I run 20/40 gearing with my stock 70p chain?I see people changing from 20 top to an 18 top and 68p is the smallest chain from Yamaha.Im only hitting 8450 in our sad excuse for powder here in Maine.Thanks.
 
68 tooth for 20-40 and lower.

I've got a spare 20 tooth gear and 68 chain if you can get me to actually ship it
 
I guess I dont understand the differance between going down two teeth
with a 68p or a 70p.If I needed a new chain to go to a 20 from a 22 why dont you need a new chain to go to an 18 from a 20??I think it is the same differance or am I missing something?
 


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