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  1. #1

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    MSX 150 wonít rev past 4200 rpm!

    Please help! Ready to part it out! Ski has 88 hrs, bought knowing it had this problem hoping itís just a sensor.starts instantly and red light till warmed up then wonít rev past 4200 with no service light.replaced map sensors, checked butter fly on throttle body opens and closes with handlebar throttle, no oil in intake tract , new plugs gapped correctly,good gas and new fuel filter,ran sea foam thru it,compression 125- front 130 -rear, oil checked at bottom of dipstick not screwed in! Iíve ridden it around for hours hoping it would clear out.

  2. #2

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    Msx 150 -2004

    Friggin auto correct!

  3. #3

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    Also the turbo boost is 3bars on the gauge and waste gate lever is not stuck

  4. #4
    Moderator HiPeRcO's Avatar
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    Welcome to Greenhulk!

    The boost gauge is merely an estimate, controlled by the ECU. I'd start by checking to see if your turbo is seized, or not spinning freely.

  5. #5

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    Does the turbo come apart enough to check in the boat or does it need to be removed?have had a few skis but never turbo! Real nervous about messin around with it . walk me thru it please!

  6. #6
    ripcuda's Avatar
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    To check on the turbo... you have to get your fingers in the compressor inlet opening. To do that, you have to first unbolt (2 bolts) the intercooler (IC) and loosen/remove the 2 intake hoses to the IC... this will allow you to push the IC forward and onto top of fuel tank out of the way... sorta... it doesn't like to stay there. After you have pushed the IC forward, you will expose a single bolt that secures the "airbox" to the front (compressor side) of the turbo. Remove airbox bolt and slide airbox forward out of the way. Now stick your fingers into the front of the turbo and spin the turbo shaft. Does it spin freely? Is it all wobbly (off axis)? Can it wobble and contact the housing?

    Cheers!

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  8. #7

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    I will dig into it on my day off probably Monday or Tuesday! Thanks, if it is frozen or wobbly can it be rebuilt with new bearings or do I need to look for a doner turbo? I’ll keep you posted
    Last edited by Gonzzo; 07-12-2019 at 05:56 PM. Reason: miss spell

  9. #8

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    I took out the 2 bolts you mentioned and 2 big hoses on the inter cooler and it will not break loose, it wiggles but not enough to move it. Do the sea water hoses need to come off too?

  10. #9
    Moderator HiPeRcO's Avatar
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    Quote Originally Posted by Gonzzo View Post
    I took out the 2 bolts you mentioned and 2 big hoses on the inter cooler and it will not break loose, it wiggles but not enough to move it. Do the sea water hoses need to come off too?
    Pull harder

  11. #10
    Ye Ol Salty Dog's Avatar
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    What HiPerCo said... pull harder


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