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  1. #1
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    Seeking a Leakdown test Kit for 951

    I got my engine put together, and ready to be put on the ski, I'm seeking a leakdown test kit, that I can use for a 951 carb model.

    any other ideas.?

    thanks all.


  2. #2
    Kidd800XP's Avatar
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    Build one. Take all your gaskets to someone who has a cnc machince and have the make them from aluminum plate. Bring them home and drill them. Take one and tap it for a fitting.

  3. #3
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    i might get some plexi and cut it with a band saw.

  4. #4
    96XPSS's Avatar
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  5. #5
    retro jet's Avatar
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    Got any old bike tubes? Cut them up to the rough size as the gaskets and cut or punch holes needed for mounting. Use the smooth inner side of the tube as the sealing surface. Bolt your tube gasket under the exhast and intake manifolds. Leave the valve stem in one of the tube gaskets and mount so it is sticking out one of the black plastic intakes, hook your pump to that. A decent tire pressure gauge can give you a reading.

    What should it hold, 6-9 psi for 3 minutes? Can you pressure check with Raves installed or should they be removed and blocked?
    Last edited by retro jet; 02-04-2010 at 10:16 PM. Reason: cleared things up

  6. #6
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    hey guys I started cutting some out off a cutting board, I will try the tube part, with the valve stem to save me on money.

    My father has a band saw thats out of wack, it took me longer to adjust it cause it kept dropping the blade, I'm cutting them now,

    Tomorrow I have to go out and steal some little kid's bike for its inner tube, bahahahah

  7. #7
    Mark22's Avatar
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    I made the block off plates from some cheap aluminum and I can't get it to hold air. When I tighten the plates down, they flex and let air leak out. I even got some 1/8" rubber gasket material and I still can't get my motor to hold air. I'm working on an 800 and I think the air is leaking around the inside of the blockoff plate at the exhaust header and going through the water jacket. I'm going to try bolting the top part of the tuned pipe on with the rubber in between and see if that helps. A good idea from Retro! O'Reilly's will have the fittings you need pretty cheap. Get an air tank fill fitting, it's like a valve stem with threads on the other end.

  8. #8
    Mark22's Avatar
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    BTW, what psi should a motor hold and for how long? There should be no leak down over how long? Mine was leaking about 2 psi in 15 minutes. I still think that was coming from the blockoff plates though.

  9. #9
    SURFnTURF's Avatar
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    Quote Originally Posted by Mark22 View Post
    BTW, what psi should a motor hold and for how long? There should be no leak down over how long? Mine was leaking about 2 psi in 15 minutes. I still think that was coming from the blockoff plates though.
    This is from the manual as below.

    Activate pump and pressurize engine to 34 kPa
    (5 PSI).
    CAUTION:
    Do not exceed this pressure.

    Wait 3 minutes and check if pressure drops; if so,
    verify all testing components.

  10. #10
    96XPSS's Avatar
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    Find some flat smooth rubber material about 3/16" thick. That's what watcon used to sell with their pressure test kits.

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