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Piston Broke are only Motorcycle engineers nowt else
Steve Riley is the guys name if you have to phone and take it there to be done.He has a comp database with shed loads of info on it for bikes...

Give this guy a ring he has been around since the late 60's early 70's does classic and modern bikes he defo knows his stuff if any one can help you he should be able to ,he use to do all the rebores...