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  1. #1
    urugol's Avatar
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    The Pro Arrived!! Pics Inside.

    Looks like the SL has a cousin. The tandem trailer looks a whole lot better now

    The hull seems to be in pretty good shape, a couple of chips here and there nothing major. I performed my own compression test as soon as I brought it home, just to be sure. The guy that did it told me 100-85-100 so I started with the MAG and got 120 I'm thinking ok that's 2 to go, this could be good. Unfortunately my next readings were 105, 90(PTO). Ok looks like the rebuild will continue!

    I removed the head as I wanted to make sure nothing major, piston hole or otherwise and it looks ok-ish from that perspective.

    The MAG piston has a part number 4577J on it, the other 2 are 787B stamped. Just wondering, if this is all stock or has the MAG piston been changed to something else? This is testing well so I'm interested to hear from the wrenchers.

    Overall I'm pretty happy, I'll be the only dude out there with a 785. The guy I purchased it from who ran the biggest dealership in Australia tells me there are only a dozen or so examples in the country.

    It has a few extras as well, oil converted to premix (not sure if that's stock, my first pro), worx sponsons and intake grate, umi steering, finger throttle, tau cetis look new.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #2
    ujustlost's Avatar
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    NICE! The Polaris Underworld Strikes Again!

  3. #3

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    Very nice
    The front cylinder has a Wiseco piston in it and the other 2 are factory Polaris you will want to make all three the same as the Wiseco is lighter .
    They came stock with oil injection

  4. #4
    urugol's Avatar
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    I think I will go with forged pistons for this build, I would like reliability I don't want to do this every year! Is there any point getting 2 and maybe re-ring the wiseco (and clean it up) or go all 3 kits? pwcengine.com do the forged Wiseco kit for $119 a piece. I would also like to know of a good vendor I can pickup Mikuni rebuild kits from. I probably won't start for a few weeks yet, will need to strip things down and get a full shopping list together.

  5. #5

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    Quote Originally Posted by urugol View Post
    I think I will go with forged pistons for this build, I would like reliability I don't want to do this every year! Is there any point getting 2 and maybe re-ring the wiseco (and clean it up) or go all 3 kits? pwcengine.com do the forged Wiseco kit for $119 a piece. I would also like to know of a good vendor I can pickup Mikuni rebuild kits from. I probably won't start for a few weeks yet, will need to strip things down and get a full shopping list together.
    The only Problem with the Wiseco's is you Really should have the Cylinders replated to match the clearance for them they use 6-7 thousenths clearance compared to 3-4 thousenths clearence on a stock piston
    I'll Pm you some GOOD info for pistons

  6. #6
    thester71's Avatar
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    Interesting..... I wonder if they adjusted the clearance and replated for the wiseco? Will the wiseco make good comp# in a stock bore? Also, I have never seen one of those plates bolted around the steering, looks like they did some wave jumping, or at least set it up for jumping.
    Good luck with the rebuild, hope everything goes well.

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Nice.....

    I can't believe a dealership/race team would install only 1 Wiseco piston. That's just dumb!!!!!

  8. #8
    urugol's Avatar
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    Quote Originally Posted by xlint89 View Post
    Nice.....

    I can't believe a dealership/race team would install only 1 Wiseco piston. That's just dumb!!!!!
    I was thinking the same thing. I'm told it raced 4 or 5 times in 00/01 so it may have been rebuilt when no longer racing. It was built as a "gift" to the dealer on the premise they would enter races and raise the profile of Polaris in Australia.

  9. #9
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Your #'s make sense,the mag was real rich the other 2 were real lean. Looks like you will have a ski that everyone over there will be saying WTF was that????

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by xlint89 View Post
    ...I can't believe a dealership/race team would install only 1 Wiseco piston...
    Looks like they burned down the MAG piston, then replaced it.

    Looking at the piston wash patterns, they then set the MAG carb for really rich, just to make sure it didn't burn down again.

    Be sure to check the carb settings before you rebuild them, and check the carb jet sizes.

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