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  1. #1

    what size piston are these?

    Hi I have a seized 98 gp1200 and Im trying to find out what size the pistons are. The only thing thats written on the pistons are "65u" on one side then the letter "F" on the other . Thanks, david


  2. #2
    krispaintballz's Avatar
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    Quote Originally Posted by rxtnewbe View Post
    Hi I have a seized 98 gp1200 and Im trying to find out what size the pistons are. The only thing thats written on the pistons are "65u" on one side then the letter "F" on the other . Thanks, david

    they are 84.0mm. You are going to want to jump to next size if the the walls are scorn. Um i would go 84.25mm. That would be the next step. I would either do pro-x pistons, oem, or wiseco. If doing wisecos give a little more clearance. And Always bring your pistons in with you when getting them bored so they can match up the pistons to the cylinders.
    thanks

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