Vintage Dirt Bike Q & A

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 Post subject: Suzuki RM125 1976 engine
PostPosted: Fri Jun 07, 2013 11:03 am 
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Joined: Wed May 11, 2011 8:33 am
Posts: 17
Hello , does anyne know if I could put a 1977 RM125 crankshaft, connecting rod and piston, with the 1977 cylinder and head onto a1 976 RM125 caee. I beleive the bottom ends were all the same from 1976-1978. The 1976 did use a different crank and cylinder compared to the 1977 and 1978 RM125.
Thanks, any deas??? john


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PostPosted: Sat Jun 08, 2013 12:47 pm 
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Joined: Fri Jul 14, 2006 8:12 am
Posts: 323
Location: Wuppertal/Germany
1976, Bore x stroke: 56.0 x 50.0 mm
1977 on, Bore x stroke: 54.0 x 54.0 mm
cause of the different stroke the cases might be not intercangeable.

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PostPosted: Tue Jul 09, 2013 6:00 pm 
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Joined: Fri Apr 04, 2003 11:34 pm
Posts: 43
Location: Daytona Beach, FL
I believe you could use the cases from a '76A and the crank, top end from a '77B. The '77 RM100B is basically a sleeved down '76A. B-joe is correct that the bore & stroke are different, but if you are using the '77B crank and top end, it should work.


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