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  1. #1

    msx150 won`t rev past 3400rpm

    hi guys iam new to skis and this forum i have just purchased msx150 ski and it has travelled half way across the country(australia)and it does not rev past 3400rpm in reverse or forward
    the ski has had a new turbo,motor,wiring loom fitted and only around 2 hrs on these parts
    i need some help the handbook recommends that it a fautly reverse switch but disconnecting this makes no difference
    can somebody help me
    john


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Welcome to the Hulk!

    Click here for the Polaris Service manuals, including the 2004 MSX 150.

    Are you near Melbourne? We have a few other members from Oz.

    Update your Profile so it is easier for us to keep track of who has what, and where.

    Are you seeing any messages or red light on the NGI digital display?
    When you put it in reverse, does the display say reverse?

    What is the service history of this machine?
    Was it sunk?

    Has it ever worked properly since the motor was replaced?

    Has compression been checked?

    What is the oil level reading on the dip stick?
    These engines are easily over filled, as the dip stick markings are incorrect. Full level when cold, means over full when hot.

    'Too full' oil level can cause some oil to get pushed into the intake tract, where it can contaminate sensors and plug up the intercooler. You might want to look inside there for signs of oil.

  3. #3
    hi sorry iam from melbourne
    the ski has not been sunk
    the previous owner says it run correctly but i have doubts now
    there is no R showing on the display when in reverse mode
    a red light flashes on the display for only a few seconds when started then goes out
    i will have to check if the oil has been overfilled
    i will also check the comp
    anything else i should look at
    thanks
    john

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by hotx19 View Post
    ...anything else i should look at...
    Work through the diagnostics outlined in the Service Manual.

    Something may jump out as being worth checking into more thoroughly.

    Why was the engine replaced?

    Can you talk to the shop that did the work, even if they are far away? They might be able to tell you more about the machine, or suggest what to look for.

    Also, check that the wastegate shaft is not binding. It shouldn't be with a new engine, but worth checking.

    Read through other threads in the MSX section, as we have a few other MSX 110 and MSX 150 owners that have contributed their experiences and knowledge.

    FYI, the MSX 140 and Matrix have completely different engines, not the Weber 4-stroke type you have.

  5. #5
    Rocky_Road's Avatar
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    The E.S.P. (Enhanced Steering Performance) system, and the wiring harness connections need to be checked.

    The ESP system check is detailed on page 2.8 in the service manual.

    A fault in the ESP system will limit you to 3400 +/- 50, and NO Check Engine light.

    P.S. The 'blinking' red light on startup is normal...the ECU is sweeping the various sensors, and looking for any problems. It goes off within 10 seconds (approximate) on my ski.

  6. #6
    thanks for the replies guys
    i have had the ski at a repair centre over easter and this week
    well they have come back to me saying that there are no codes in the computer to show any faults
    he is now telling the the turbo has most likely failed causing this problem
    is this most likely my problem or not
    to me it feels like a rev cut from the ecu not a mechinical problem
    i don`t want give this bloke the go ahead unless i am 125% sure, its going to cost $4500 to fix
    john

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by hotx19 View Post
    ...I am new to skis
    ...just purchased msx150 ski and it has travelled half way across the country (Australia) and

    it does not rev past 3400rpm in reverse or forward
    the ski has had a new turbo, motor, wiring loom fitted and only around 2 hrs on these parts
    i need some help the handbook recommends that it a faulty reverse switch but disconnecting this makes no difference...
    Quote Originally Posted by hotx19 View Post
    ...the previous owner says it run correctly but i have doubts now
    there is no R showing on the display when in reverse mode ...
    Quote Originally Posted by hotx19 View Post
    ...had the ski at a repair centre over Easter and this week
    well they have come back to me saying that there are no codes in the computer to show any faults
    he is now telling me the turbo has most likely failed causing this problem...
    Something doesn't add up.

    The ski has a new wiring harness, new engine, new turbo, and it doesn't run properly.

    Reverse doesn't indicate on the NGI display.

    If it ever ran properly after the engine replacement, it doesn't now.

    Who ever does the diagnostics, needs to not assume anything is correct, and check every possible connection and installation detail. It really needs someone who is very familiar with the Weber engine, if not also the MSX 150 Polaris.

    It sounds to me like something was installed incorrectly, or a connection has opened up somewhere.

    Do you know if the service shop that has it now does much work with Weber engines, like actual R&R, or even rebuilding them?

  8. #8
    he says he knows the ski well but also said that he was not intrested in doing the turbo work if it needed to be done
    just does not add up he tells me whats wrong and gives me a cost but does not want the job!
    john

  9. #9
    Watcon's Avatar
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    I have some used turbos in stock, and offer rebuilding also. http://www.watcon.com/Catalog_Pages/Turbo_Repair.htm

    Thanks,
    Randy

  10. #10
    Kosh's Avatar
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    This diagnosis does not sound right, tell me out of the water when you pin the throttle what does it sound like? If it is sensing reverse mode the engine will hunt on the rev limiter, it is a hard limit not soft.

    I would imagine a shorted wire in the reverse circuit to the ECM you may have to check continuity back to the ECM plug. Use a pin very carefully to act as the contact probe to the ECM plug. Whatever you do dont peirce any wiring. If this is a 'new' harness there is no garantee it is right.

    It may take some time but will be worth it once it is right

    Cheers

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