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Need help asap
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Author:  55stone [ Thu Aug 19, 2010 10:44 pm ]
Post subject:  Need help asap
Hey guysim restoreing a 1979 rm 80 but the crank is bad... Been looking for one if anyone has one let me know... But my question is I found one on eBay but the guy says it fits 78 and 79 rm80 but also fits 79-81 rm 60? Is that possible?they have to be different size and weight and stroke length aren't they?? Let me know asap plz
thanks guys... Stone
Author:  Axceler8r [ Tue Aug 24, 2010 1:02 pm ]
Post subject:  Re: Need help asap
Stone,

It is possible that the crank will work in the '79-'81 RM60 as well as the RM80. The bore will definitely be different and the stroke may be as well. The difference will be in the connecting rod. The bore will not matter, but the stroke will. Look up the Bore x Stroke specs for both models. Ypu may be able to use the RM60 crank with a new RM80 rod. I have several RM's and the cranks on some models will work in others, with the correct rod ('77 RM125B and '77 RM100B share the same bottom end). :)
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