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  1. #1
    RiverRat19405, im a rat in the water RiverRat19405's Avatar
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    center cyl down to 100 psi

    the other 2 are 150 if i broke a reed would that cause my low commpression motor only has 51 hrs on an was done bye richie at sharps or should i take the head off first an check piston


  2. #2
    Pain is fear leaving your body.... rlovebk's Avatar
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    Taking head off easier first check imo. If no probs there go to reeds. What ski?

  3. #3
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Even if the reeds were not installed, it wouldn't change compression that much.

  4. #4
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Quote Originally Posted by starflight View Post
    Even if the reeds were not installed, it wouldn't change compression that much.
    What he said.

  5. #5
    Just say NO to "Stock" TechSLX's Avatar
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    Quote Originally Posted by rlovebk View Post
    Taking head off easier first check imo. If no probs there go to reeds. What ski?
    I agree as well, seems to maybe be just a "chunk" possibly out of the top of the dome piston, or a bad ring, etc, could be due to lean setting damage? Check wash, pull head and chances are the answer will present itself immediately.

    Also believe Rat runs a 96-97 SL780 if I remember correctly, right Rat?!?!?

  6. #6
    RiverRat19405, im a rat in the water RiverRat19405's Avatar
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    96 sl780

    i took the ceter head off an this is what i found no scoring of cyl walls no pits on head-----can any one tell me if they are std pistons or over sixed ? thanks for all your help ski only has 51 hrs on think carb did this every thing was replaced fuel hoses rebuild carbs id like to get it running for the weekend
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by RiverRat19405; 07-03-2009 at 06:46 AM. Reason: added stuff

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    That's a standard size piston.

    YOU"RE ABOUT TO LOSE THAT PISTON!!!!!!

    Notice the pitting/crater in the center?

    That cyl is WAY too lean. You've barely got a TINY bit of wash formed near the arrow.

  8. #8
    RiverRat19405, im a rat in the water RiverRat19405's Avatar
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    anybody have a std 780 piston for sale with rings an ckips let mw know

  9. #9
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    I have one I can spare. $24.72 shipped?

  10. #10
    RiverRat19405, im a rat in the water RiverRat19405's Avatar
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    ill take it ill send pay pal after work does it have pin an clip too?

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