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  1. #1

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    Mag cylinder running hot

    I have a 96 slx 780 and the mag cylinder is running at over 210 F while the other two are in the 130 to 150 range. I have one of those point and shoot temp gauges. Is this too hot. and if so what could be causing it.
    I have water from the hose on it. and seams to be running free out the rear.
    If the thermostat was sticking won't all the cylinders be hot.
    rich


  2. #2
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    On the hose the mag will run hotter than the others. Those temps are a little bit higher than I had before the triple pipes. I'm thinking 115-125 on the pto and center, and 150-160 on mag. Is the mag burning ok? Check the wash? If it's lean it will be hotter. I'd be inclined to pull the head to check the gasket and water passages. You run in salt water?

  3. #3
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    I had the water flow restricted a bit as we have alot of pressure and volume of flow. You have plenty of water supply? Does your ski have the t'stat still?

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Starflight is correct. The MAG will run hotter on the garden hose because it's the last to get water, plus has the added heat of the elec stator charging.

    Was the MAG piston or rings replaced recently? That will also add more heat.

  5. #5
    casey67's Avatar
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    Are you using a flush fitting attached to the water rail?

  6. #6

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    Thanks for quick response,

    The cylinders had been reworked. and the thermastat is still in .....soon to be removed. I increased flow to the low speed and the high speed needles.
    I changed the system to premix and i'm running32 to 1 for break in purposes.
    If this doesn't get it i'm pulling the head to see whats up.
    thanks
    rich

  7. #7
    xplayer2885's Avatar
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    Quote Originally Posted by desertmariner View Post
    Thanks for quick response,

    The cylinders had been reworked. and the thermastat is still in .....soon to be removed. I increased flow to the low speed and the high speed needles.
    I changed the system to premix and i'm running32 to 1 for break in purposes.
    If this doesn't get it i'm pulling the head to see whats up.
    thanks
    rich
    Desert:
    Did you happin to go through your carbs? My ski did the same thing to me a couple seasons ago. It would run insanily hot, turns out i was oozing gas outta the atmospheric vent, causeing the ski to run lean. If the carb adjustments/checking piston wash arent working. I would work through the carbs.

  8. #8

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    Update on ski,
    I did rebuild the carbs and set the pop off 20 -23 psi. I also went to premix.
    I removed the thermostat today and ran it. The mag cylinder was hovering around 210 degrees F and it sounded o.k.. This was on a hose.
    Going to try to take it out tomorrow or Sunday, weather permitting . It's been real windy here lately.
    Rich

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Add a little more fuel on the high speed (1/4 turn OUT) screw to account for the oil in the gas.

    You can also try this if you're worried about that cylinder:

    Remove the 3/4" hose from the jet pump on the inside of the hull. (coolant intake)
    Connect your garden hose to it, and run it like that. (following the normal out of water precautions)

    This will act as on the water. MAG temps should come down to normal.

  10. #10

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    So following xlint advice she's a running cooler. Today i get to take er for a spin and see if she can get up to speed and not get hot under the mag collar. Could of been breaking in or more likely the water delivery process. Hopefully Neptune is smiling on this ski's maiden voyage (with me).
    Rich

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