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View Full Version : Need to know Stock Bore on 250R


250Rman
10-02-2002, 08:50 PM
I need to know the stock bore size of a 1985 250R. I am looking to rebuild one and want to bore it out, I will be using a micrometer

Thanks
Unregistered
10-03-2002, 06:03 AM
The stock bore on a 1985 250r is 66mm and the stroke is 72mm for 246cc's