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  1. #1

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    is this ski overheating??

    I have a 96 sl 650, I used a lazer temp gun,,,and after warming up, the rear cyl gets 150deg, the center gets 120 and the mag cyl gets up to 180-190deg, is this temp diff normal?
    what temp do these machines overheat? The light/buzzer does not go off.

    I was worried about it running lean so I just went threw all the carbs and replaced the fuel lines,, all is good there,,

    any ideas?


  2. #2
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    What ski do you have? They didn't make a 650 in 96.
    The 650s temp sender closes at 180F.

    Are you running it on the hose? If so, the temps will be uneven, and the mag will run hotter than the others using the reverse flush fitting.

  3. #3

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    sorry, i ment 750,,

    i am running it on the hose, but I read somewhere that if the cyl is too hot to touch then it may be overheating,

    do you think it is safe to water test?

    how will I know if i am melting the top end?

  4. #4
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    650-750 Has the same temerature trip point, but they stopped making those skis in 1995. The sensor will not trip on the hose, as the water enters right where the sender is when flushing.
    Have you checked the t'stat to see if it will open? Set it in a pan of hot water, and it should open at 140F. Alot of people delete the t'stat to keep from having troubles with it.
    Sure, test it in the water while strapped to the trailer. Make sure the bow of the ski is strapped down to the frame of the trailer so it can't kick up while under power.

  5. #5
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Quote Originally Posted by schlik83 View Post

    how will I know if i am melting the top end?
    In the water after it has time to warm up, you should be able to put your hands on the heads for a few seconds without getting burned. Take the temp gun with ya, and check it out.

  6. #6

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    ok great thanks, Ill let you know what happens,

    and, i dont know where the thermostat is, ill research it a little..

  7. #7
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Item #23.


  8. #8
    johnsonmtz's Avatar
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    Quote Originally Posted by schlik83 View Post
    sorry, i ment 750,,

    i am running it on the hose, but I read somewhere that if the cyl is too hot to touch then it may be overheating,

    do you think it is safe to water test?

    how will I know if i am melting the top end?
    running on the hose for any extended time will cause odd cylinder temps. You just cant get enough water flow to keep them at a regulated operating temperature. Also, the pump bearings will get warm as well.

    You could take the ski to the lake along with your IR temp sensor. Ride it for a bit then beach it and shoot the temps of each cylinder. You should get a warning light if the temps get too high and it trips the temp sending unit.

    KJ

  9. #9

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    Talking

    this ski is a 95! I only just figured it out,, bought it thinking it was a 96, the guy said it was a 96,,,

    oh well,,

    I took it out today and it ran great!! felt super fast and was a ton of fun!

    I forgot to bring the dang temp gun so i couldnt see the temps but I rode for an hour with no temp warning or anything, so hopefully it is ok,, I will bring the gun next time, prob tomorrow

    thanks for the help!

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Arrow Checking engine temperatures using your hand

    Quote Originally Posted by schlik83 View Post
    ... I forgot to bring the dang temp gun so i couldnt see the temps but I rode for an hour with no temp warning or anything...
    You have a temperature sensor on the end of your arm

    Engine should be quite warm, but not so hot you cannot hold your hand on it for a few seconds. 140F means roughly this;
    Put your hand on engine head, cylinder, or exhaust manifold (engine off, after running).
    If you can hold your hand there for 1, 2, 3, time-to-let-go! Then the engine temp is probably within range.

    If water drops sizzle when the touch the engine, or you cannot touch it without pain and/or burning skin, then it is too hot.

    If you can hold your hand on it all day, then it is running very cool.

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