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Thread: Is this lean ?

  1. #1

    Join Date
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    Is this lean ?

    i've just taken the head off my 98 xpl ltd.

    It's not been apart for two seasons and has been running the last year on flame arrestors and bigger jets. Probably done at least 60 hours

    The thing is everything is spotless - the cylinders crowns have a tiny bit of carbon in the middle but most of the crown is spotless. Same with the head - light tan staining but practically no carbon. Tried to post a photo but couldn't do it. Bores are near perfect - still see the honing marks of the rebore.

    Most motors I've stripped are black as.

    Has this motor been running lean ? or has something else caused the ultra clean running ?


  2. #2
    Actually reads like it is running and jetted perfect.. And your using a good oil...

  3. #3

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    Yeah - that possibility had crossed my mind. Just never seen a motor so clean after so much running. I use pretty good oil

    I thought if it was lean it would have blown by now

  4. #4

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    Click image for larger version. 

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  5. #5
    Never seen one that clean before - almost like it has been washed clean from excessive fuel..

  6. #6

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    That photo is straight after the head came off.

    I wondered if the head gasket was blowing water and it was getting steam cleaned maybe ? Bores look good though

    The ski was going really really well and something happened - felt like a wee hiccup - and instantly mid run it lost a bit of oomph.

    It goes ok now but not like it used to and it seems to be getting progressively worse. That's why I'm stripping it - looking for the hiccup !

    Not sure on a two stroke what can fail to give instant power loss - felt same as a stick through the pump but pump is not damaged so not that

  7. #7

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    An excessively rich mixture will wash off your piston like that. Maybe one of your reeds broke or a pop off in the carburetor. Also looks like you have a lot of buildup in your coolant passages, do you run in saltwater?

  8. #8
    Joe Stang's Avatar
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    Check the stud on the exhaust manifold that holds the head pipe to it.

  9. #9

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    Yeah 95% salt water.

    Pulled the jugs last night. Reeds look good and exhaust manifold bolts look ok. Pistons and rings look good too. no probs with crank bearings. looked inside mag cover and that seemed fine.

    i've not stripped the carbs yet.

    so looks like a carb issue or water ingress somewhere - head gasket or exhaust area.

  10. #10
    surferd15's Avatar
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    Looks really rich to me, or water washing the tops.

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