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Discussion Starter · #1 ·
i purchased a 99 xc 500 with broken piston, when i took apart the ring gaps are toward the exhaust port. this is not correct is it? i do not have a manual for mach. the other piston is the same. this cyl is cast iron correct?
can this cyl be bored? thanks for any info
where can i download a manual on this sled?
 

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When I bought my ZR, one of the pistons was installed backwards as well. It had been rebuilt by a pro?
 

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The gap should be on the intake side. There should also be an arrow on the piston crown either pointing to the exhaust side or to the flywheel/recoil. If the ring gap is on the exhaust side, the piston was installed backward. The locating pin can fall out, which allows the rings to turn in the groove, and when the ring gap gets to the exhaust port, the end of the ring snags the port. That happens from time to time, but usually to only one ring.
 
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