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Old 06-10-2007, 09:49 PM
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Default 1978 RM250 and 78 1/2 RM 250 differance

     

I just got a 1978 RM250 with a blowen top end and started to reasearch for parts I have found that ther was a 1978 and a 78 1/2 RM 250 does anyone know the differance?
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Old 06-10-2007, 10:09 PM
Florida 393's Avatar
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Usflag Re: 1978 RM250 and 78 1/2 RM 250 differance

The 78 was an RM 250C the 78-1/2 was the RM250C2, the tank was plastic on the C2 and the fenders were changed to a ribbed style to prevent breakage when mud loaded up on them. The C2 front forks were air/oil sprung and the steel swing arm on the C was replaced with an aluminum unit. The front hub of the C2 was changed to the conical unit form the RM125B/C from the full width unit the C had. To the best on my knowledge the bore/stroke were identical. I seem to remember that the port timing was changed from the C to the C2 (I only owned a C2.) The C2 was a really great bike to ride and race. Check the parts numbers at Wiesco to see of the bore is the same. The B model was the big change to a long stroke engine from the square configuration of the A.

Bill

Last edited by Florida 393; 06-11-2007 at 06:43 AM.
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Old 06-10-2007, 10:11 PM
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Default Re: 1978 RM250 and 78 1/2 RM 250 differance

so as far as engine parts go the 78 and 78 1/2 should be the same then eh
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