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  1. #1
    jeepsrdreaming's Avatar
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    800r engine problems

    Hi all,
    I am hoping to get a diagnosis from someone with more experience.
    I brought a xl800 with engine problems.
    the compression was good on the front cylinder, but the rear read 60psi.
    and i could hear the piston hitting the head when i crank it over.
    my fear was a burn piston, damaged head, and cylinder.

    when i took off the head, here is what i found:
    the rear cylinder head area is noticeably darker, but the good news is that all seem to be fine with the piston and the cylinder, except you can see the impact marks of the piston hitting the head.. there are fine shavings of metal on the head at the impact areas.
    another thing i noticed was that when i first pushed down on the bad cylinder's piston, the piston give about 1/4 inch before it engaged the crank.
    anyone know what went wrong?
    thanks in advance


  2. #2
    Mike xsockguyx's Avatar
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    How many hours on the engine? what was the compression of the other cylinders? Do you have pictures of the damage? Then we can assess your situation. You are going to need to do a rebuild that for sure.

  3. #3
    jeepsrdreaming's Avatar
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    i don't have pics yet, i forgot to do that.
    i was wondering if it's something simple enough that i can take a shot at myself.

  4. #4
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Your crank went out take out the cylinder and you will see the damage.

  5. #5
    I have a new OEM crank T/W for sale for the 800... I live on the Island as well

  6. #6
    jeepsrdreaming's Avatar
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    well... that definitely throws a wrench into my plans.

  7. #7
    If your not doing something, its hard to screw up. stlouisramsfan's Avatar
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    literally and financially

  8. #8
    Quote Originally Posted by xsockguyx View Post
    How many hours on the engine? what was the compression of the other cylinders? Do you have pictures of the damage? Then "I" can assess your situation. You are going to need to do a rebuild that for sure.
    hahahahha, Mike do you even know where the spark plugs go!
    I see your part time job is now an internet jet ski repair parts connoiseur!



    hahahahahaha just messin with ya...
    Hey where`s that prop you were going to send me prick???

  9. #9
    Sounds like you Lost a lower rod bearing that took out the piston and cylinder.

  10. #10
    jeepsrdreaming's Avatar
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    stop pulling my crank
    haha
    put seriously.. i think it's time to part it out, and focus on my gpr build.
    pulling the engine and the computer this weekend, anyone want parts off of the rest of a 2001 xl800.. (except for the 3 degree pump nozzle) let me know!

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