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Will a RM 250 motor fit a 1982 RM125 frame?

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I have a 1982 RM 125 that I drove for years motor went out (lower end) but was a strong bike.I wanted to rebuild it or can the frame take a 250 motor,someone said the RM 125 and 250 had the same frame?Thanks for the help

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Nope ~ the frames are different, the 250 cases are bigger (longer). Although RM465 or 500 engine will fit into a 250 frame...

You could drop a PE175 engine into your 125's frame, and that would give you some real low end and mid range, plus the 175 is geared for more top end speed and it has a lighting coil if you wanted lights or even wanted to make it street legal.

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