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  1. #1
    baba850r's Avatar
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    msx 140.....making it faster???

    a mates just got himself a 2003 140 msx with 52 hrs on the clock.the ski is bone stock and hes after a bit more performance from it.
    what sees the best gains on thes skis?or will a grate,prop and intake be about its limit without spending poinless money on it?
    he uses his ski 50%lake 50%sea.


  2. #2

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    Polaris MSX 140 Hop Up

    Hi You asked about doing some work on your Stock MSX 140 because of the fuel injection there is not a bunch you can do I have been playing around with compression and some port timing. After 380 hours on the OEM engine I thought that its was time to rebuilt the engine over the winter last winter so I would have a fresh motor this year while I was in there mad some mods I have 49 hours on the engine with mods and fuel injection mods I picked up 100 rpm Im turning 6860 rpm in most water conditions I mainly ride the river in Laughlin and Im getting 61-62 on the meter and I'm a Big Boy 290lbs and ride the Sh_t out it. Its Running great and I will keep you posted.
    PS I LOVE AMSOIL DOMINATOR its good stuff


  3. #3

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    MSX 140 Bolt ons

    I should have started I ride an 2003 with the simple bolt on Stuff Like a 6 degree wedge and an 04 Ride plate Im still running the stock intake grate.

    I will keep you posted as I get more hours on the engine.

    I wont be doing much riding for a month Im trying to get me Matrix togther before summer ends I'm doing a Big Bore Stroker motor and Yes I will Post Porn as I Go.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    2003 MSX 140 performance upgrade options

    Quote Originally Posted by baba850r View Post
    a mates just got himself a 2003 140 msx with 52 hrs on the clock.the ski is bone stock and hes after a bit more performance from it.
    what sees the best gains on these skis?

    or will a grate,prop and intake be about its limit without spending pointless money on it?

    he uses his ski 50%lake 50%sea.
    First off - have all the Polaris Service Updates been done to the machine? There were several important updates that apply to the 2003 MSX 140 model.

    Also look here;
    Polaris Ficht Fuel Injected Engines

    Make sure this has been done;
    Ficht fuel injected engines; fuel hose abrasion at injectors, possible fuel leak
    How to repair, per Service Bulletin PWC-04-01, repair kit 2202878


    There are several things that can be done to improve performance on the MSX 140 model.

    Check the throttle cable slack, and make sure the throttle plates really are opening 100% when the throttle is fully squeezed.

    Loosen the TPS mounting bolts, twist the TPS body firmly against the bolts in the anti-clockwise direction (looking from the rear), then snug the TPS bolts. Do not over-tighten the bolts, to avoid cracking the TPS body.
    This ensures the TPS tells the EMM 100% when the throttle is fully open.

    Install a six degree pump wedge, which will lift the nose a little for more top speed.

    Install a 2004 ride plate;
    5631598-329 is the '2004' MSX ride plate

    Install an aftermarket intake grate. The best one apparently (especially for very rough water, and powered boosted engines) is a massaged Jet Dynamics grate, such as the one sold by Watcon.

    Next best is the R&D '650' intake grate. Both will improve rough water performance and jet pump hook-up.

    Install aftermarket sponsons - hard to find, very few sets were made. Improves cornering, handling.

    Install a second set of base gaskets under the cylinders. This raises the exhaust ports slightly, which provides a little more top end RPM.

    Alternative is to have the cylinders modified to improve port timing, but be careful regarding increased fuel flow requirements (see below).

    Compression can be increased by modifying/reshaping the stock heads. The stock Ficht engines will run on US 89 octane (RON+MON/2), so you can boost it to require premium gas pump fuel. If the cylinders have been raised with the installation of a second set of base gaskets, then the head can be shaved to regain the lost compression (or a bit more ).

    Be aware that Euro octane is marked differently on the pump than US gasoline. Subtract 4-5 points from Euro octane to find the approximate equivalent in US octane.

    The Ficht fuel injection system is open loop, and will NOT add more fuel if you improve engine breathing. These engines also run near the lean edge, so increased air flow will only make them more lean.

    You may get some power improvement by increasing cold air flow into the hull, especially in the region of the engine air intake. There is an air temp sensor in the flame arrestor base, so the EMM will know about cooler air and increase fuel flow to match.

    Mount heavy items, like the anchor, inside the hull at the rear. Make sure they are well strapped down, so nothing can get loose or tangle up the drive line.

    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.
    Last edited by K447; 06-01-2010 at 11:54 PM. Reason: More MSX speed tips

  5. #5
    baba850r's Avatar
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    ok thanks alot guys!yes please keep us updated.

    il have him check the skis history to see if these issues have been dealt with first off.

    i pressume for the little gains its hardly worth tuning this ski.when you could buy a charged kwak or seadoo with trading the ski in and the mod money and have a faster stock ski in first place?
    ps.im not knocking the ski at all!!!its just weve got faster skis and he wanted me to ask what mods he could do for not alot of money to get alittle more 00mph out of it.

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by baba850r View Post
    ...I presume for the little gains its hardly worth tuning this ski.

    when you could buy a charged kwak or seadoo with trading the ski in and the mod money and have a faster stock ski in first place?
    ...we've got faster skis and he wanted me to ask what mods he could do for not a lot of money to get a little more 00mph out of it.
    The throttle slack checking and TPS tweak cost nothing.

    Six degree pump wedge is modest cost, relative to a new ski. The ride plate is similar money. Both can be found used, or even new.

    R&D '650' intake grate is fairly cheap, and available used from a number of sources.

    Additional cold air intake is mostly time spent fitting it into the hull. Materials cost is modest.

    Shifting weight to the rear is also inexpensive.

    All together, these changes could add several mph to the machine.

    How much money would it actually cost to upgrade to a different, faster machine?

  7. #7
    baba850r's Avatar
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    Quote Originally Posted by K447 View Post
    The throttle slack checking and TPS tweak cost nothing.

    Six degree pump wedge is modest cost, relative to a new ski. The ride plate is similar money. Both can be found used, or even new.

    R&D '650' intake grate is fairly cheap, and available used from a number of sources.

    Additional cold air intake is mostly time spent fitting it into the hull. Materials cost is modest.

    Shifting weight to the rear is also inexpensive.

    All together, these changes could add several mph to the machine.

    How much money would it actually cost to upgrade to a different, faster machine?

    for an extra £1500 he could get a yr younger rxp.

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  9. #8
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    Is there any exhausts on the market?

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