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Thread: correct rpms?

  1. #1

    correct rpms?

    i bought an 03 msx 140 last year with 60 hrs. same compression all three cylinders 130psi i was farting around looking at other posts and i came across a few that said they were running 7200rpms at wot i havent seen anything greater than 6800 i weigh 180lbs so im not a big guy or anything also my buddy has a 01 gtx951 carb he takes me out of the hole by a long shot i eventually catch up but it takes a while is this normal or is there something i should check out any input would be great thanks


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    6800RPM at wide open throttle is completely normal for the MSX 140 engine. My own MSX 140 runs around 6900RPM, give or take.

    The RPM limiter red-line is 7200RPM, but you would only see that if the engine was running with the jet pump out of the water.

    BTW, have you checked whether all the important Service Bulletins for the 2003 MSX 140 have been done on yours?

    If you want to improve the hole shot and/or rough water hookup, an 8 or 12 vane stator would help. A different impeller might help too.

    Also consider an adjustable diameter jet pump exit nozzle, or boring out the stock nozzle. An AAT (Adjust A Thrust) from Wetwolf can also help, especially when combined with a larger diameter exit nozzle.

    There are some other performance modifications you can look into.

    Polaris Ficht Fuel Injected Engines

    Polaris PWC with fuel injected engines

    2003 MSX 140 performance upgrade options

    There are two different ride plates for the MSX 140 hull
    MSX 03 Rideplate - 5631257-329
    MSX 04 Rideplate - 5631598-329


    Flame arrestor cover cuts into air temperature sensor
    Trim plastic web to clear sensor



  3. #3
    thanks for all the input i have like six service tags on the intake cover so i imagine those were the things that needed to be fixed except one thing i took the intake cover off to see if the plastic had been shaved to clear the air temp senor and it hadnt when i took the cover off i noticed the top of the sensor had been ripped from the cover so i shaved the peice on the cover but do i now need a new temp sensor or just put some silicone on it?

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by buckhoule View Post
    thanks for all the input i have like six service tags on the intake cover so i imagine those were the things that needed to be fixed except one thing i took the intake cover off to see if the plastic had been shaved to clear the air temp senor and it hadn't when i took the cover off i noticed the top of the sensor had been ripped from the cover so i shaved the piece on the cover but do i now need a new temp sensor or just put some silicone on it?
    Clean any oil off, then seal it with a small dab of silicone

    Post a clear photo of those service tags, so others can see what a properly serviced 2003 MSX 140 looks like

  5. #5
    k that should be set i cleaned it put a dab of silicone on it i assume if anyone did need to see what the tags look like here they are
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  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by buckhoule View Post
    ...see what the tags look like here they are
    Um, those are a tad fuzzy and hard to read

  7. #7
    these ones are better i couldnt find my camera at the time haha phone pics suck
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  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by buckhoule View Post
    these ones are better...
    Service Bulletins completed on your 2003 MSX 140;

    Completed 06-05-2006
    PWC-03-02 or 03-12 ?
    PWC-04-01

    Completed 05-10-2004
    PWC-03-09
    PWC-03-10A
    PWC-03-11

  9. #9
    [QUOTE=K447;1449752]Service Bulletins completed on your 2003 MSX 140;

    Completed 06-05-2006
    PWC-03-02 or 03-12 ?



    im not sure they were completed before i bought the machine ive been searching all over to find out what # bulletins were out there but i cant find a list of them anywhere

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