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  1. #1

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    1200 engines.... genesis / txi / virage / msx the same?

    I have a 2003 Polaris MSX 140 HO

    I am just wondering which motors will fit in? Is a 99 Genesis or 2002 Virage motor the same?

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  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    All Polaris 1200 motors can be mounted in the MSX 140 hull.

    The MSX exhaust pipe configuration is slightly different from the Virage/Genesis versions, so the mechanical fit into the MSX hull needs to be verified.

    The MSX black cylinders provide 1192cc displacement and different porting than the 1165cc red engines. MSX cylinders are Nikasil plated.

    There are minor mechanical internal differences between the 1999 engine and the later version. The configuration of crank shaft seals and locating circlips is one difference.

  3. #3

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    So the MSX is closer to an actual 1200 CC. it is the MSX 140 "HO" edition,
    so what would my other machine options be for a direct swap (other than the obvious MSX 140)

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by vwmikey99 View Post
    So the MSX is closer to an actual 1200 CC. it is the MSX 140 "HO" edition,
    so what would my other machine options be for a direct swap (other than the obvious MSX 140)
    Don't get too excited by that HO decal, all MSX 140 engines carried that marketing label.

    The 1192cc MSX engine does have slightly more displacement, but the stock internal cylinder porting wasn't tuned for maximum power so overall the 1165cc red engine is on the same level, power wise. Both are a little under 140HP, maybe 125HP or thereabouts, depending on who you ask.

    There are ways to boost the power output of either the red engine or the MSX engine, despite the limitations of the Ficht injection system. Compression can be boosted slightly, and I think modest cylinder porting is possible. Cold air supply into the hull can be improved.

    The MSX has two different ride plates, and the '2004' version is the better choice.

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    By far the coolest engine swap is to install a SeaDoo 4-Tec engine. Lots of power, good fuel economy, reliable and well understood by service shops everywhere.

    There are a few GH members with MSX 4-Tec conversion projects. Some are in progress while others are on the water. Member GGG has his running over 80mph.

    Not a drop-in type project, of course. But effective, and delivers results.

  6. #6

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    but in terms of getting my machine back up and running sooner than later, I could install any bottom end (likely a red one) because they are easier to find, and put my cylinders on that?

  7. #7

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    A motor that I could get readily available parts for sounds fantastic, but that was a very ambitious project for me at the moment.. I think is it is.. I'm on a bit of a quest finding a reasonably priced crankcase/crankshaft

    Quote Originally Posted by K447 View Post
    By far the coolest engine swap is to install a SeaDoo 4-Tec engine. Lots of power, good fuel economy, reliable and well understood by service shops everywhere.

    There are a few GH members with MSX 4-Tec conversion projects. Some are in progress while others are on the water. Member GGG has his running over 80mph.

    Not a drop-in type project, of course. But effective, and delivers results.

  8. #8

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    your MSX cylinders will not directly bolt on a standard 1200 motor the MSX cylinders are thicker on the base and require longer studs . You would need to split the cases on both motors and change all the studs to make it work .

  9. #9

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    msx 140 carbureted

    I have a 03 msx 140, I put a 99 genesis engine in it, like it was said, the msx cylinders will not fit. the genesis engine came with 135 hp. the cylinders for the msx are nikasil plated and have 2 additional exhaust ports in the cylinder wall.

    I took my genesis engine and bored it 1.5 over. I was lucky, the engine i got was a sbt rebuild, so the crank was welded. I milled the heads to bump the compression, and ran the delta 2 reeds, jetted the carbs. the wiring is not fun to do, but it will have more power than a stock msx 140 and should go high 60's on the water

  10. #10

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    Quote Originally Posted by 785 lugs View Post
    your MSX cylinders will not directly bolt on a standard 1200 motor the MSX cylinders are thicker on the base and require longer studs . You would need to split the cases on both motors and change all the studs to make it work .
    And bore out the top case to MSX's 95mm, the standard 1200 case is 94mm where the cylinder skirt slides down into.

    and do the studs and add a front oiler hole.

    You can run the crank seal and E-clip set UPI from a standard 1200 No Problem.

    Other then that your Golden.

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