Vintage Dirt Bike Q & A

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PostPosted: Mon Oct 19, 2009 9:03 am 
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Joined: Fri Dec 14, 2007 12:04 pm
Posts: 16
I have a 1980 RM100 that needed new cases, the bearing pockets were shot on the old ones. I picked up a mint set of cases from a 1979 rm125, everything was going together great until I got to the crankshaft. The journals on the old crank (diameter) are too big for the new cases.The cases and crank on the RM100 and 125 were the same for '79 and '80, EXCEPT for the fact there was a model "N" and a model "T" version for both models. Does anyone know how to determine which one had the bigger crank?
Thanks,

_________________
1974 CR250m
1975 MT125,CR125
1978 CR125
1980 CR125
1982 CR250
1979 RM400
1979 IT175
1973 XR75


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