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  1. #1

    Pic of OEM Polaris 750 Piston Top?

    I just bought a tote of cool 785 parts off a former racer, and it included a few new pistons, but they dont have the same markings as my '98 785 pistons do, and the skirt length looks a little shorter (almost 100% sure they are OEM 750 pistons). Does anyone have a picture of a clean OEM 750 piston top to compare? Otherwise I can take a pic myself of what I have. Thanks!


  2. #2

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    sure sounds like a 750 piston whats the casting # on the top ?

  3. #3
    ripcuda's Avatar
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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by 785 lugs View Post
    sure sounds like a 750 piston whats the casting # on the top ?
    What he said ^^^^^^

    W7A would be a 750 piston.

    A piston with a "Z" in the cast # would be for a PRO

  5. #5
    Thanks Xlint89...they read W7A on the tops.

    Thanks!

  6. #6
    So I have read multiple posts on this, but I need to confirm. Can I run a stock 750 piston in my 785 without rebore-renick? Can I use 750 rings on 785 pistons? I was told that the 750 rings are actually BETTER than the 785 rings...is this true?

    I am faced with a dillemma regarding piston supply right now for my '98 Pro 785. I have 2 785 pistons with 9 hours each that look good, 2 785 pistons with 58 hours that also look good. As you know the 785 pistons are discontinued. I have 2 brand-new 750 pistons, and 5 piston rings for the 750. I can still buy 750 pistons and rings, and still buy 785 rings.

    Given this, what would you all put in a 785?

  7. #7
    Canadian Beaver Inspector jkindt's Avatar
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    Quote Originally Posted by bigred70 View Post
    Can I run a stock 750 piston in my 785 without rebore-renick? Can I use 750 rings on 785 pistons? I was told that the 750 rings are actually BETTER than the 785 rings...is this true?
    The 750 pistons require the 750 rings due to the shape of them. I think the only way to use the 750 pistons is to have the 785 cylinder sleeved. I am sure it can and has been done, but I am not the expert on this and I have been known to be wrong lately.

  8. #8

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    you can use 750 or 785 rings on either piston the 750 rings are better and will last longer .I would get another 750 piston and rings with 750 wrist pins they are lighter also and no you do not have to have the cylinders redone that is just a myth someone on here posted it's totally untrue racers have been running this setup for years .

  9. #9
    Thank you all!!

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