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  1. #1

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    what the hell did i just buy

    well i feel kinda dumb that iv been stalking this auction all of last and this week , http://cgi.ebay.com/ebaymotors/ws/eB...m=270280224429

    now tell me whats missing in this picture , hope fully its a stock picture like he didnt have time to take a picture of it ,



    but did any body notice bearings missing on the top , in case it does come like this and it is the right crank how hard is it to get the last bearings on do they just slide on ? or do they need split again ,


    sorry i was trying to be cheap and am going for a completely new drivetrain for my ski to bring up the value


  2. #2
    ph2ocraft's Avatar
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    Full circle cranks are Saweeeet!!

  3. #3

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    whats the full circle about explain im a nube .

    why isnt there bearings on the front ?

  4. #4
    ph2ocraft's Avatar
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    Full circle cranks have completely circular webs as opposed to a pork chop looking web as in the photo below.
    Better balance= less vibration, safer high revs and longer life.


  5. #5

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    ok last and final question you are awesome al ,

    how much labor is it to install the front bearings , if ordered from polaris parts and sent it off to randy ,

    hopefully she comes ready to see 7000+ rpms

    is this gonna be a pia to time correctly ?


    al i dont even care if it shows up finish with your comments ill glady pay to have it finished up

  6. #6
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    My guess is you'll need a bearing on each end. But that's a hell of a snag. (I think they run about 1200+ rebuilt) You won't feel that normal vibration at about 2200 R's and you can wind it up way past 7000 R's.Maybe someone else can add,but I'll bet you take the bearings, put them in a oven at 180* for 1/2 hour and put the crank in a freezer for a couple of hours they will slide right on. Timing is no harder then any other time. It's all been covered here.

  7. #7

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    if thats what i have to do ill glady buy 20 $ bearings from polaris and do it ,

    i cant wait for randy to be back home ,

  8. #8
    Wow, nice find. I wish I would have been more on the ball with this one....

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Keddano View Post
    ...You won't feel that normal vibration at about 2200 R's and you can wind it up way past 7000 R's...
    Quote Originally Posted by ph2ocraft View Post
    Full circle cranks are Saweeeet!!
    For non-full circle 1165 crankshafts, what max RPM is reasonable?

    What engines came with full circle cranks from Polaris?
    Are these full circle cranks a Polaris special order part#, or aftermarket?

  10. #10
    Connecticut CrazyA's Avatar
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    It's really based on your "feet per minute of average piston speed". That's the "average feet per minute that your piston travels" as the name would imply. That would then be calculated to get your theoretical "safe rpm".

    It's a good idea to keep that number below 4,000 feet per minute, even less on a watercraft, as there are some variables that other 2 stroke motorsports vehicles don't have to contend with.

    If pushed beyond it's safe limit, things like broken cranks, broken rods, broken pistons, broken rings and disintegrating lower end bearings can happen.


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