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Discussion Starter · #1 ·
im rebiulding a xlt its piped but not sure what kind of pipes there all sepprit no collecter on the pto pipe the end of the pipe was smashed almost closed would it it be posslble that it could melt the piston on the exhaust side? lacking power last year than only 50pto 120c 120mag compression does any buddy know the jetting on a 95 xcr 600 for pipes im rebuild it for a friend and its a mess.

thanks
 

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The pipes could have been part of the problem, but I would bet the Pto crank bearing went bad, taking out the crank seal. This will cause a lean condition because air will get sucked in through the seal. The lean condition will cause a piston meltdown. This is a common problem on certain year Polaris monoblock 600 triples.
 

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the tailpipe end makes all the difference in your pipes.. if its closed up too much it will reflect too much heat back into the cylinder and yeah.. meltdown.
 

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Discussion Starter · #4 ·
the pto seal is fine im betting on the smashed end of the pipe it sticks out aleast 3 in. out of the chassis when i took the motor apart the good pistons had good carbon deposists minamal blow by im going to bore the bad cyc and honed the others dump rings in and a over sized piston 20 over
 

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The later'95 XCR's had a defect in the case.The PTO side oil oils is smaller than the others. A rebuild needs to be done correctly so it won't grenade again. You should find out if this motor is in fact one of them.

Read about it here:

http://www.geocities.com/schmidt92/polaris_faq.html
 
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