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  1. #1
    XLTNoob
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    This was intended to be a piston wash thread, BUT... (PTO cyl damaged)

    #3 cyl replaced last year due to lean seizure. Replaced cylinder & piston with used OEM, plus opened all jets 1 turn. Ran fine for the rest of the season.

    Second short ride this season, Ski started and ran great for both runs, short of a slight miss at wide open RPMs.

    Busted the head off to look at piston wash, as I dont have one of those fancy scopes.

    At this point, I'm not even sure what that cylinder ate. Guess I have some work ahead of me.
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  2. #2
    krispaintballz's Avatar
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    Looks like a rod bearing. OUCH! Looks like something ung up on that transfer port too.

  3. #3
    XLTNoob
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    Sigh, I really hope not. I did a full rebuild including crank when I got the ski about 4 years ago. Not looking forward to spending that $750 again!

  4. #4
    krispaintballz's Avatar
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    Grab that coupler and move it back and fourth. Does the piston move as much as the other two or just sit there?

    Well, You got the head off already knock out those four bolts and take off the cyl. Let me know what you find.

  5. #5
    WATER WOODY's Avatar
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    Possible crank bearing...your engine is lean!

  6. #6
    BoostCrzy's Avatar
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    judging by the way that transfer port is hit.....I would say a ring rotated or somehow hung on the port and that is what chipped off and caused the damage to the piston/head/cylinder....pull that cylinder/piston so we can see...

  7. #7
    XLTNoob
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    Thumbs down

    It's already getting dark here in Texas, I did the best I could with my halogen.

    It doesnt appear to me like either of the rings have rotated. It does look like a peice of the piston chipped off and ate up the top of the piston as well as the head.

    Connecting rod to Crankshaft "in and out" play is virtually nil, and the wristpin bearings look virtually pristine!

    Thanks again Woody and Kris, for chiming in on this, I didnt even realize it was *still* lean!
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  8. #8
    XLTNoob
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    Here's the video of me moving the connecting rod.


  9. #9
    WATER WOODY's Avatar
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    Got any pics of the under side of the pistons.

  10. #10
    XLTNoob
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    All three or just the one I've removed so far?

    This one is the underside of the PTO.
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