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  1. #1

    piston meltdown pto and mag

    i just rebuilt my top end used it a couple days went out on the lake yesterday and died dead in the water. took home this is what i found

    one on left is the mag and right is pto

    Click image for larger version. 

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  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Did you also rebuild the carburetors and replace the fuel hoses?

    Carburetor settings correct?

  3. #3
    Had the carbs done by someone else checked them for possible clogged filters and they were all good. fuel system upgraded to triple outlet fuel pump, updated fuel lines, restrictor fitting installed on return line, have a feelings carbs were not set correctly they were out of spec when i checked them i set them to as follows

    Low Speed – 1/2
    High Speed – 1m, 1/2c, 3/4p

    Let me know if that is not correct and if theres anything else i should do. the center cylinder carb was set correctly and had no piston meltdown. Is there anything else i should check and i am also using 8 ngk heat range plugs

  4. #4
    need some suggestions i am going to be replacing the pistons, replacing reed valves do to them having some small chips, replacing gasket kit, going to perform a leak down test with 9 psi but what really concerns me is the carb adjustment

  5. #5
    BlueFishCrisis's Avatar
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    What year and model?

  6. #6
    95 sl 750 standard bore

  7. #7
    Connecticut CrazyA's Avatar
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    What was the original reason the top end was done? Just tired? Meltdown?

    I wonder if you should take a look at the fuel selector valve while you're at it?

  8. #8
    BlueFishCrisis's Avatar
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    Quote Originally Posted by 95gtx205 View Post
    Had the carbs done by someone else checked them for possible clogged filters and they were all good. fuel system upgraded to triple outlet fuel pump, updated fuel lines, restrictor fitting installed on return line, have a feelings carbs were not set correctly they were out of spec when i checked them i set them to as follows

    Low Speed – 1/2
    High Speed – 1m, 1/2c, 3/4p

    Let me know if that is not correct and if theres anything else i should do. the center cylinder carb was set correctly and had no piston meltdown. Is there anything else i should check and i am also using 8 ngk heat range plugs
    Those are correct.

  9. #9
    It was tired, had single output fuel pump, wen i disassembled it had lit meltdown in piston nothing near comparale to this and the middle piston was still good As this 1 still is

  10. #10
    think this is meltdown is a lean condition to carbs? or is there no way to tell

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