550sx pro series crank rod questions
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  1. #1
    Resident Guru 87kawi650sx's Avatar
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    550sx pro series crank rod questions

    Hey guys. Been a while since I've been on here. Years ago I got new 550 crank that's been welded, and has pro series rods. Finally got around to building a motor I'd like to use it in. Went to put the pistons on today, the end of the rods that accept the wrist pin/bearing had slop when I installed the piston. I took it apart to measure. The ID of the pro series rods measure 21mm, vs a stock crank which measures 20mm. I emailed IMS, but does anyone know if they made a heavy duty crank rod, that might have taken a beefier wrist pin bearing? Or have any other ideas?
    93' blaster- BONE stock, looking for parts


    91' js440 hull- PJS T3, PJS head (190 psi), Pjs exhuast mani, PJS intake mani, dual cdk taper bored 40's, 440 blue printed/honed pump, ocean pro nozzle, 18* prop, all the bolt-ons besides ignition.




  2. #2
    Resident Guru 87kawi650sx's Avatar
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    Re: 550sx pro series crank rod questions

    93' blaster- BONE stock, looking for parts


    91' js440 hull- PJS T3, PJS head (190 psi), Pjs exhuast mani, PJS intake mani, dual cdk taper bored 40's, 440 blue printed/honed pump, ocean pro nozzle, 18* prop, all the bolt-ons besides ignition.




  3. #3
    Resident Guru 87kawi650sx's Avatar
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    Re: 550sx pro series crank rod questions

    93' blaster- BONE stock, looking for parts


    91' js440 hull- PJS T3, PJS head (190 psi), Pjs exhuast mani, PJS intake mani, dual cdk taper bored 40's, 440 blue printed/honed pump, ocean pro nozzle, 18* prop, all the bolt-ons besides ignition.




  4. #4
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: 550sx pro series crank rod questions

    Doubtful as it would require special made pistons, but here is another idea maybe it takes a thicker bearing. Seadoo for instance makes two different 657 crankshafts, either one takes the same pistons and pins but the bearing sizes are different. You would probably come a lot closer to finding a bearing to make that work than a piston...............

    Like this one ; https://www.amazon.com/B1005-16X21X2.../dp/B005KLQJ6S
    Last edited by WFO Speedracer; 11-30-2022 at 04:39 PM.
    Y'all know me, still the same O.G. but I been low-key
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    Re: 550sx pro series crank rod questions

    My Guess is you purchased someones custom crankshaft.

    I call stuff like this "Shelf Parts". The parts that don't work
    end up on a shelf. Then someone that doesn't know why
    the parts were on the shelf decides to sell the parts.


    Bill M.
    Horsepower == Speed, RPM != Speed



  6. #6
    Resident Guru 87kawi650sx's Avatar
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    Re: 550sx pro series crank rod questions

    Looked around for some bearing yesterday. Found these, same ID and legnth and factory 550 bearings, but 21mm OD instead of 20mm. Hopefully they work. And hopefully this is a stock stroke crank

    Screenshot_20221202-091425.pngScreenshot_20221202-091418.png
    93' blaster- BONE stock, looking for parts


    91' js440 hull- PJS T3, PJS head (190 psi), Pjs exhuast mani, PJS intake mani, dual cdk taper bored 40's, 440 blue printed/honed pump, ocean pro nozzle, 18* prop, all the bolt-ons besides ignition.




  7. #7
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: 550sx pro series crank rod questions

    You know I posted you that link about two days ago right ?
    Last edited by WFO Speedracer; 12-02-2022 at 02:08 PM.
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    WWSRD , What would Speed Racer do ?

  8. #8
    PWCToday.com Is My Home Away From Home Bionic racing's Avatar
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    Re: 550sx pro series crank rod questions

    Is that a T type crank? Or full circle ?

  9. #9
    Resident Guru 87kawi650sx's Avatar
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    Re: 550sx pro series crank rod questions

    Quote Originally Posted by WFO Speedracer View Post
    You know I posted you that link about two days ago right ?
    Sorry, didn't see that! Appreciate it. They fit great.
    93' blaster- BONE stock, looking for parts


    91' js440 hull- PJS T3, PJS head (190 psi), Pjs exhuast mani, PJS intake mani, dual cdk taper bored 40's, 440 blue printed/honed pump, ocean pro nozzle, 18* prop, all the bolt-ons besides ignition.




  10. #10
    Resident Guru 87kawi650sx's Avatar
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    Re: 550sx pro series crank rod questions

    T style crank
    93' blaster- BONE stock, looking for parts


    91' js440 hull- PJS T3, PJS head (190 psi), Pjs exhuast mani, PJS intake mani, dual cdk taper bored 40's, 440 blue printed/honed pump, ocean pro nozzle, 18* prop, all the bolt-ons besides ignition.




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