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RM 500 has a 92.5mm piston ??????

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Just pulled down this RM500 engine, the stock cylinder has been bored for a 92.5mm piston, no name on the piston, its a sigle ring cast item, the small end is quite small about 17mm? & the little end of the rod has a solid bronze bush.

So any ideas what the piston is from? thanks

Edited by pxr5

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