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Thread: 1450 motor ???

  1. #1

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    1450 motor ???

    Is anyone going to make a 1450 motor or is this a dead idea, i'm going to pick up an 03 MSX 140 with a bad motor next week . I also picked up a set of 96 1200 race pipes and polaris intake manifolds and a polaris msx head cover . i want to try and make the pipes work in the msx hull if not i'll use them in my pro 1200 . So my question is who can build this motor or even a 1350 ???


  2. #2
    ph2ocraft's Avatar
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    I think the cool stuff is locked down and hidden Bob.
    Kevin and I are thinking it's time to drop the 1350 into the SLTX with a single pipe and see what she has.

  3. #3
    rlharrison60's Avatar
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    Quote Originally Posted by ph2ocraft View Post
    I think the cool stuff is locked down and hidden Bob.
    Kevin and I are thinking it's time to drop the 1350 into the SLTX with a single pipe and see what she has.
    Is the 1350 a standard motor? I dont know alot about all the polaris engines.

  4. #4
    ph2ocraft's Avatar
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    The last standard 2 stroke engine Polaris produced was the MSX an almost true 1200 at 1196 cc's.

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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by ph2ocraft View Post
    The last standard 2 stroke engine Polaris produced was the MSX an almost true 1200 at 1196 cc's.
    Are the parts used to build the 'bigger than 1200' PWC motors standard Polaris parts (from the snowmobile engines?), or aftermarket/custom parts?

    Is it a stroker crank shaft and bigger cylinders+pistons?

  6. #6

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    i just wanna know what kinda sleeves they use and what pistons really ,

    i cant imagine that thing can be stroked any more than what it is

    where the gpr killer

  7. #7
    ph2ocraft's Avatar
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    There are of course many variables but if you go bigger than the standard 85mm, you looking for exotic stuff. I know PSI as well as others will make pistons specific to your needs.
    As you may have guessed, if you go larger than 85, you're also going to lose the Nikasil cylinders as most will bore and sleeve the cylinders to accept the larger pistons.
    Stock cranks can and do get stroked at that's just the beginning. The magic they can do with a crank is COOOOL, just open your check book. LOL

  8. #8
    We are making 250 to 300 hp out of 1200 CC watercraft cases with 800 Snow cylinders. We make trail motors out of these for sleds, but we have never tried to put on in a PWC. Pipes would be the biggest hurdle and cost, and then comes the pump and getting the Horsepower hooked up in the water

    Would be quite a ride for sure in a watercraft Hp range is around 8800 rpm


    Last edited by prochamp; 07-19-2008 at 02:27 AM.

  9. #9

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    Well maybe i'll just go the same way Dan is going i'll just send the cases ,cylinders and intakes out to be ported by Randy and use what pipe is the ???

  10. #10
    PolarisNut's Avatar
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    Quote Originally Posted by K447 View Post
    Are the parts used to build the 'bigger than 1200' PWC motors standard Polaris parts (from the snowmobile engines?), or aftermarket/custom parts?

    Is it a stroker crank shaft and bigger cylinders+pistons?
    A 1350 uses $200+ea. 89mm custom cast pistons made by PSI, re-Nikasil plated MSX cylinders bored to 89mm with custom porting, and a 1050 crankshaft stroked from 68mm to 72mm. The crank pin is pulled out, crank wheels are welded up, and the hole is drilled 2mm futher out from the center, for a 4mm gain in stroke. Very pricey due to the labor involved. The 1165 crank isn't stroked because it already has a balance issue.

    Quote Originally Posted by 97sltx1050 View Post
    i cant imagine that thing can be stroked any more than what it is
    Why not?
    Last edited by PolarisNut; 07-19-2008 at 10:53 AM.

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