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Thread: Cylinder Heat

  1. #1
    Cliffy's Avatar
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    Cylinder Heat

    Im still testing my ski before taking it down to a launch point

    Today I run the ski up for 4mins and found that one of the cylinders felt hotter than the other to, the clyinder at the rear of the ski felt hotter. I could still touch it etc

    Is this normal? Should I be considering a compression test?? If so anyone got a how to guide for the test??

    thanks
    Neil


  2. #2
    Flying Scotsman's Avatar
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    Well the first thing I was wondering is,was the ski siting level or with the nose down.
    Try it again with the ski siting level on the trailer.
    If it ran for 4 min it must have been on the water hose right.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Is the drive shaft in place?

    If so, then 4 minutes is way too long on the hose. Keep it under 2 minutes, otherwise you risk melting the lips on the drive shaft through-hull and impeller seals.

    Are you reverse flushing the engine, or is the garden hose connected to the main water inlet from the jet pump?

    Reverse flushing will not give the engine even cooling, especially if the thermostat system is not all there. Often, the MAG/front cylinder will run hot ont he hose.

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    It's normal for the MAG (front) cyl to run hotter than the other 2 when using the flush fitting on the cooling bar. Not normal for the rear.

    As mentioned above ^^^^^ should only run for a few minutes on the hose if the driveshaft is installed.

    I'd suggest adapting the garden hose to the intake hose (3/4") at the rear of the ski. Then see how the cyl temps feel.

    This will mimic the ski running on the water as far as the cooling system is concerned.


    FYI: Always turn the engine on before the water. Then turn the water off before the engine. This will prevent any chance of water filling up the engine case.

  5. #5
    Cliffy's Avatar
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    Spot on Flyingscottsman, the ski was on a hill nose facing downwards

    Yep it was on a hose K477, I wont run it for that long again without the prop disconnect, any info on how to do this??

    Xlint, when you say adapt the hose any pics of what you mean and where im putting the hose into??

    Cheers guys for your help i think im getting there with it, I am grateful.

    Neil

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Cliffy View Post
    ...I wont run it for that long again without the prop disconnect, any info on how to do this?...
    You remove the jet pump, then the drive shaft just slides out.

    Once you know how it is done, it takes about 10 minutes to remove a jet pump

  7. #7
    Flying Scotsman's Avatar
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    Quote Originally Posted by Cliffy View Post
    Spot on Flyingscottsman, the ski was on a hill nose facing downwards

    Yep it was on a hose K477, I wont run it for that long again without the prop disconnect, any info on how to do this??

    Xlint, when you say adapt the hose any pics of what you mean and where im putting the hose into??

    Cheers guys for your help i think im getting there with it, I am grateful.

    Neil

  8. #8
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Quote Originally Posted by Cliffy View Post
    Spot, when you say adapt the hose any pics of what you mean and where im putting the hose into??


    The arrow in the pic is pointing to the hose you can adapt a connection to feed water the way it would while running in the water.
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  9. #9
    Cliffy's Avatar
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    Quote Originally Posted by K447 View Post
    You remove the jet pump, then the drive shaft just slides out.

    Once you know how it is done, it takes about 10 minutes to remove a jet pump
    I'll do a search on it and see what i can find, sounds god to me though

    Quote Originally Posted by starflight View Post


    The arrow in the pic is pointing to the hose you can adapt a connection to feed water the way it would while running in the water.
    Wicked stuff cheers for the pic ill have ago at this over the weekend, would i still need to disconnect the Pump???

  10. #10
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Quote Originally Posted by Cliffy View Post
    would i still need to disconnect the Pump???
    Only if you plan on running on the hose for more than a couple of minutes at a time.

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