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Thread: 1990 polaris sprint fix up

  1. #1
    Super Moderator Maim's Avatar
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    Default 1990 polaris sprint fix up

    gf bought a 1990 polaris sprint for her god daughter for $250.00 that ran and drove. i got volunetold to help fix it up for the kid. stock skid and track are scrap other than some wheels that i can save. as it already has 2.52 pitch drivers on it, i am putting a decent 1" take off track from a 2009 phazer with a 1992 ish phazer II 121" skid. already know i need to make some 1/4" plates to mount the skid as the phazer tunnel is 17" and the sprint tunnel is 17-1/2". what i need to know is if there are any tricks having to mount the skid in the tunnel to retain ski pressure on older leaf spring sleds.
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    500cc mutant margarita mixer (09 phazer rtx/x)
    1000cc of yamaha excellence (apex xtx)

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  2. #2
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    Center of drive axle back and top of tunnel down measurements from the Phazer II (unless driver diameter is different than Phazer) is what you need to mount the skid in order to keep tunnel clearance and track tension adjustability.

    Ski pressure will be a skid adjustment issue.

    opsled
    I reserve the right to change my mind if someone can prove to me it needs replacing.

  3. #3
    Super Moderator Maim's Avatar
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    the phazer drivers are larger than the sprint ones by almost 3/4".
    sleds
    410cc reliable power (enticerII) rx tunnel braces
    500cc mutant margarita mixer (09 phazer rtx/x)
    1000cc of yamaha excellence (apex xtx)

    motorcycle's
    00 xt350 mod
    08 wr250x

    atv
    2005 big bear pro

  4. #4
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    If the Phazer drivers are larger you would want to move the mount holes a little further to the rear. Measure the difference in diameter and divide that number by 2. That's how much further back over stock Phazer measurements.

    opsled
    I reserve the right to change my mind if someone can prove to me it needs replacing.

  5. #5
    Super Moderator Maim's Avatar
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    Well the phazer has 8 tooth stock and the Sprint has 6 tooth. Drive axle is 9mm to centre from top of tunnel on sprint. The phazer is 14.5 mm. Looking like I only need to map mount plate pattern as there does not look to be a need for drop brackets on the sprint.
    sleds
    410cc reliable power (enticerII) rx tunnel braces
    500cc mutant margarita mixer (09 phazer rtx/x)
    1000cc of yamaha excellence (apex xtx)

    motorcycle's
    00 xt350 mod
    08 wr250x

    atv
    2005 big bear pro

  6. #6
    Super Moderator Maim's Avatar
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    well just got the dang thing together and now i need to tear it apart. polaris told me drivers on it where 2.52 pitch and they are not. they are 2 pitch. getting a set of 7 tooth drivers that i will get machined down some to try and make it so that i do not need to mod the front of the tunnel. also even with compensating for driver size and adding, skid still needs to go farther back but with the driver size change i might get away with it.
    sleds
    410cc reliable power (enticerII) rx tunnel braces
    500cc mutant margarita mixer (09 phazer rtx/x)
    1000cc of yamaha excellence (apex xtx)

    motorcycle's
    00 xt350 mod
    08 wr250x

    atv
    2005 big bear pro

  7. #7
    VIP Member A couple of bucks's Avatar
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    Quote Originally Posted by Maim View Post
    Polaris told me drivers on it where 2.52 pitch and they are not. they are 2 pitch.
    That really bites!!! A 2" pitch is ........ different.
    Dannyboy

  8. #8
    Super Moderator Maim's Avatar
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    yup and the guy who has been doing polaris parts for at least 20 years, who still didn't know, that the pitch was different. heck he is the one that told me it was 2.52 pitch.
    sleds
    410cc reliable power (enticerII) rx tunnel braces
    500cc mutant margarita mixer (09 phazer rtx/x)
    1000cc of yamaha excellence (apex xtx)

    motorcycle's
    00 xt350 mod
    08 wr250x

    atv
    2005 big bear pro

  9. #9
    Super Moderator Maim's Avatar
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    well time for an update on this bugger. got the 7 tooth drivers installed on the shaft and turned down 1/4" smaller. then discovered that the top of the tunnel needed to be raised at least 1/2" to get them in with the track in the right spot. put the phazer II skid in and discovered a bunch of rivits and the steel bulk head needed a tweak to make me happy with it turning it over by hand. now i need to close the front up and fab a tunnel extension and new rear bumper. going to use a gytr 09 phazer rear bumper i have because it fits inside of the tunnel and is set up for a tunnel extension. i can see the finished product. a lot of damn work let me tell you.
    sleds
    410cc reliable power (enticerII) rx tunnel braces
    500cc mutant margarita mixer (09 phazer rtx/x)
    1000cc of yamaha excellence (apex xtx)

    motorcycle's
    00 xt350 mod
    08 wr250x

    atv
    2005 big bear pro

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