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  1. #1

    cause for rave valve plastic to roast - any Mech. seen this

    96 gtx and the rear rave cover and plastic piston roasted.
    I can only guess that the valve(blade) was not sliding and it stayed in close to the hot gases and transfered the heat up the stem and melted the valve. Does this sound right. Or is this thing have a lean problem or something else?


  2. #2
    Faster Than a Snail on a Log mongorunner's Avatar
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    yours is the rear mine is the front




  3. #3
    Faster Than a Snail on a Log mongorunner's Avatar
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    issues with cooling possibly ?


    did you check your plugs? mine didn't have signs of lean issues or any over heating tho...

  4. #4
    Hydrotoys's Avatar
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    Yup. Seen it quite often. Lots of blowby on that shaft for some reason??

  5. #5
    Faster Than a Snail on a Log mongorunner's Avatar
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    Quote Originally Posted by Hydrotoys View Post
    Yup. Seen it quite often. Lots of blowby on that shaft for some reason??

    haven't really checked it for blowby, actually i didn't even consider that a factor...bad valve? oring? shotty gasket? crappy valve housing or all of the above?

  6. #6
    GTXX's Avatar
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    usually worn out parts cause it.

  7. #7
    Faster Than a Snail on a Log mongorunner's Avatar
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    Quote Originally Posted by GTXX View Post
    usually worn out parts cause it.

    rotted oring


    i went ahead and changed out the orings on both raves while i was doing it... lets hope that fixes the problem... but im going to have to wait to get a new upper bellow( maybe i should order extras?)


    hope this can help you crashem

  8. #8
    My o-rings were hard as a rock, but still intact. The bellows looked as if it was leaking as well. From what I can tell is that the small port opening fills the bellows with air pressure as the it revs and slides the blade(valve) up creating a larger exhaust opening. If it does not slide. I THINK it sits there in the heat and gets a lot hotter then it should. Causing the plastic to melt. I think I will start checking the o-rings once a year. The front one was leaking oil around gasket. I just got this ski about a month ago. first one I have had. I have been reading this forum almost everyday since I found it 3 weeks ago. I have yet to find anything on this. Anyone else out there know what the cause is.
    If the seal is leaking a guess it would lose crankcase pressure and there by not have enough to actuate the bellows is this correct or I'm I in totally off?

    Mongorunner Mine looked just like that........

  9. #9
    Mine did that and I found that the rave housings were worn and allowing to much hot air in the diaphram. Blowby, like someone else said. I got a used set of RAVE housing and the problem is solved.

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