10-18-2013, 11:45 AM #1
- Join Date
- Oct 2013
Rebuilding a 97' gp1200 piston matching
I'm new and this is my first jet-ski project. It had a bad #3 piston and i ordered a wsm rebuild kit. The question is do i need to match these to the stock weight pistons. The .5 over wsm's are 15 grams heavier and that's too much to remove from the new piston's. Does this 3 cyl. need bob weights on the crank to balance it. Will the heavy pistons cause problems? thanks MKing
10-18-2013, 06:19 PM #2
Its best to use 3 pistons that are the same size and from the same manufacturer and that's what I would do. But you can get away with mismatching to a certain extent. I think you can get away with using 2 std bore OEM pistons and one .5 over WSM without much issue. But that about the max I would be "comfortable" with.
15 grams does seem like a lot to remove to balance out the piston weights. I'd probably just leave it alone and run it.
10-19-2013, 07:02 AM #3
- Join Date
- Jun 2010
- Milwaukee WI
Can you get a .5 over OEM piston? The weights might more closely match. The wiseco pistons are also considerably lighter.
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