?What bore diameter for Garelli 1st OS???

Charlie Christensen /

What is the bore diamenter for the 1st oversize piston ..... my new '1st OS piston' has 40.37 stamped on the top. Now I need the bore taken out .... only need help to what mm's.

Thank You

Charlie C

Re: ?What bore diameter for Garelli 1st OS???

John Joedicke /

Standard bore is 40mm. First oversize is 40.40mm ring size. Mopedjunkyard has rings and pistons, rings 6.95 each FG 2mm pattern. Good luck finding larger Gerelli rings, you may have to use another peds rings to get a larger size after a rebore. Your bike has had one already, you may not be able to do it again. Don't know how much material you have to work with.

Re: ?What bore diameter for Garelli 1st OS???

Charlie Christensen /

I have the rings and piston .... brand new off ebay only need to tell the machine shop guy how much to cut :)))))) So thnk you CC

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