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Thread: msx 140

  1. #1

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    msx 140

    looking for info on 03 msx 140.engine will not spin faster than 6600 rpm.when machine was new it spun 6850.i just replaced engine and followed break in rules.i had the same issue before it blew and figured engine was just tired.274 hrs.any suggestions would be appr.thanks


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Any other issues?
    Rough running at any RPM?
    Mid-range throttle response is good?

    Any missing or roughness at WOT?

    Do you have another Ficht machine to compare with?

    Any servicing just prior to the RPM change with the old engine?

    What was replaced?
    Just the engine itself?

    Is the replacement a genuine Polaris engine?
    The OEM MSX 140 cylinders are nicasil plated.
    What break-in procedure did you use?

    Has the actual top speed changed from when you had 6850RPM available?

    Any damage to impeller or stator blades?

  3. #3

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    msx

    original engine rebuild.still has nicasil cyl.no damage to impeller or stator..011 clearance.speed is down 3-4 mph on speedo.break was 1/2 throttle on & off for 20 min & let cool down.1/2 to 3/4 about 40 min & let cool down.1/2 - 3/4 throttle 2-3 hrs.next day 1/2 -3/4 pinned a couple of times for the first hr then on the bar lots.no service before lost rpm

  4. #4

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    The emm is programmed to kick in a limiter at 6700+/-100 RPMs pulls back ignition timing to keep the ski from over reving. Not sure why it was running at 6850. put at that point it should have been starting on the rpm limiter. Are you sure while you are riding the ski before you did not have your weight more to the back of the ski? Or standing on the plat form?

  5. #5

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    msx

    standing on rear platform it runs 6650.what does anyone think about shiming the impeller out for more rpm

  6. #6
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    Quote Originally Posted by 4stroker View Post
    The emm is programmed to kick in a limiter at 6700+/-100 RPMs pulls back ignition timing to keep the ski from over reving. Not sure why it was running at 6850...
    Without checking the manual, I think the Ficht EMM limits at 7200RPM, and the carb'ed CDI limit is lower, around 6700RPM.

  7. #7

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    Do a compression check. Mine is the same way. 2 of the 3 cylinders are down to 90 psi. I think I know why, but until I re-fresh them, I am unable to verify.

    Ran it all summer this way and have not done another comp. test. It starts real hard and pukes gas out, then starts and runs on 2. Then after warm-up is runs on 3 and spins to 6450. Going to tear it down this fall.

  8. #8

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    msx

    thanks for all the replies.i shimmed a 17/22 skattrat .80 and now runs6700-6750.the rebuilder uses wsm pistons which are .008 shorter than stock so i will cut the heads.my squish is.085.i was running .066.i had them cut to that when machine was new.

  9. #9

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    WSM Pistons for the MSX 140

    On your MSX 140 WSM only makes pistons for the older Polaris 1200 with an 84mm bore so they run the 1.00mm = 85mm they work but yes you will drop compression I have check the volume of the stock Polaris MSX 140 piston and the WSM piston there is a 1.8cc differnace in the amount of valume this will lower the compression 15-20 PSI.

    I'm a Big seller of WSM pistons & Parts and love them but if you want a aftermarket piston that is the same as stock Polaris MSX 140 there is a piston on the market called SPI brand there made for a Polaris Snowmobile RMK 800 the machine is the same as a MSX 140 85mm bore and 70 stroke

    I did some work looking up spec's and part numbers on the Polaris RMK 800 years from 99-2004 have the same Factory Polaris part number as a stock MSX 140 there the same pistons from polaris so I have been using these SPI brand in my own MSX 140's and all of MSX's that I work on in the shop.
    I get them from the guy that Rebuilds my Crankshafts and does the machine work for my shop.
    I looked on his site but did not find them I know there always working on the site but your can call them if you need them.
    www.ShortBlocksRus.com

  10. #10
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    Quote Originally Posted by lovehavenfun View Post
    ... if you want a aftermarket piston that is the same as stock Polaris MSX 140 there is a piston on the market called SPI brand there made for a Polaris Snowmobile RMK 800 ...

    I did some work looking up spec's and part numbers on the Polaris RMK 800 years from 1999-2004 have the same Factory Polaris part number as a stock MSX 140 there the same pistons from Polaris so I have been using these SPI brand in my own MSX 140's and all of MSX's that I work on in the shop.

    I get them from the guy that Rebuilds my Crankshafts and does the machine work for my shop.
    I looked on his site but did not find them ...
    SPI (Sports Parts Inc.) seems to be a tad mysterious. All I can find are resellers of SPI parts, but nothing about SPI the company.

    Is there a web site somewhere for SPI themselves?

    What is the SPI part number for the MSX 140 equivalent piston?
    Is there an online reference chart for SPI pistons?

    For reference, the Polaris OEM part number for the MSX 140 piston (85mm) is 2202337
    2202337 cross references to the 2003-2005 RMK 800 snowmobile, and some others models.

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