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06kfx440

86 kx80 displacement

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So I know how to use a micrometer but a good one is so expensive. So now I have this issue. I bought the bike as a project. Before it would take 30 plus kicks to get it to run. And it did. But no back pressure. So I took the head off and I could move the piston side to side which tells me the piston is to small. So I bought the piston that belongs to that motor. Same issue. It just wiggles in the jug. The question. Without taking the jug to a shop, how do I know which one to buy without buying 5 pistons.

 

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Without getting an accurate measurement of the cylinder, it's just guess work as to what piston to buy.

I'd take the cylinder to a bike shop or machine shop and have them measure the cylinder.

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I agree with @wanrep on having a machine shop size it up and or bore it out with the appropriate piston dimensions of need be. However now re jetting the carb will come into play as well as a few other things like power bands etc. Maybe look on eBay for a oem used head ? 

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