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Discussion Starter · #1 ·
My friend has a 91 440 fan cooled polaris indy sport and we were drivng down the groomed trail today he missed a turn so he stoped turned it around and it started to die then shut off we clould not get it going well we clould get it going but it didn't sound right and stalled so we towed it homw and took a compression test one cylinder had 120psi the other ha nothen at all!. Now will the piston and sleve and head off a 488 fan all fit onto the 440 crank. He needs help.
 
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