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  1. #1
    CARLRRE's Avatar
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    Number one cylinder smoked

    I have two neighbors that each have an MSX140. Both skis suffered the same failure. Number one cylinder is smoked... Niether one of them was going fast when it happened... These skis are fuel injected and I would expect them to lean out and burn a piston unless these injectors go bad... And one have any ideas?


  2. #2
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    Could be an air leak in the engine. Maybe a crank seal.

  3. #3
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    This happened at different times I'm guessing? Is it possible they were in weeds going slow and restricting flow. Any pictures of the pistons?

  4. #4
    CARLRRE's Avatar
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    Two different skis months apart.. No both were riding about 35 mph or so at the time on a lake without and weeds or crap in the water... No pictures yet. Neither one of the owners are mechanics...If I can get some pictures I'll do my best to post them. I know that the Seadoo rubber furl lines are a real problem with the 10 percent gasahol that all the stations around the area sell. Wondering about the type of rubber that Polaris used back then.. Strange that both skis suffered from the same failure..

  5. #5

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    check the fuel pressure

  6. #6
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    The MSX I think had the gray Tempo fuel line on the low pressure side. If they do,they need to be replaced. But since it's fueled thru high pressure I doubt it would affect just the front side. But the MSX does run a cooling cover on the front flywheel cover to help with heat in that cylinder.

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