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  1. #1
    retro's Avatar
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    Best way to check for air leaks

    What's the best way to check for air leaks? My pro 1200 all of a suden will rev to 3700 rpms as soon as I start it. I pulled the carbs and checked over everything and replaced the intake and carb gaskets. I must still be getting an air leak from somewhere.


  2. #2
    Moderator beerdart's Avatar
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    Pressure test the engine.

  3. #3
    thester71's Avatar
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    Quote Originally Posted by retro View Post
    What's the best way to check for air leaks? My pro 1200 all of a suden will rev to 3700 rpms as soon as I start it. I pulled the carbs and checked over everything and replaced the intake and carb gaskets. I must still be getting an air leak from somewhere.
    In the water or on the hose?

  4. #4
    retro's Avatar
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    On the hose

  5. #5
    thester71's Avatar
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    My ski idles at over 3G when out of the water, being in the water creates resistance on the motor, therefore bringing the idol down.
    I am not saying you shouldn't check for leaks, just saying that it's normal to have a high idol when on the hose.

  6. #6
    bowsniper's Avatar
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    Put the ski in the water first. Then start it and see what the rpm's are. then spray WD-40 at the case seams and see if the rpm's change.

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by bowsniper View Post
    ...spray WD-40 at the case seams and see if the rpm's change.
    Does WD-40 still work for this?

    I wonder if it even burns anymore, with all the formula changes over the years

    Ether based starting fluid would work, but I don't like using that inside a hull

  8. #8
    Moderator beerdart's Avatar
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    Quote Originally Posted by K447 View Post
    Does WD-40 still work for this?

    I wonder if it even burns anymore, with all the formula changes over the years

    Ether based starting fluid would work, but I don't like using that inside a hull

    I know the new WD-40 does not work anymore for Potato cannons. I think it has more to do with the propellant then the actual WD stuff.

  9. #9
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    Has anyone ever tried to do a leakdown test with the pipe on? It seems like the coupler can be taken off and the pipe can be blocked with a raquetball,then you would only need to remove the carbs.

  10. #10
    Moderator beerdart's Avatar
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    Quote Originally Posted by thester71 View Post
    Has anyone ever tried to do a leakdown test with the pipe on? It seems like the coupler can be taken off and the pipe can be blocked with a raquetball,then you would only need to remove the carbs.

    The pipe is water injected so the water feed would also need to be blocked off.

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