New 750 small pin crankshaft. Flywheel doesn’t fit.
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  1. #1
    PWCToday Regular rc-hx's Avatar
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    New 750 small pin crankshaft. Flywheel doesn’t fit.

    750 small pin from a 1995 SSXI in a 550 :
    My crank blew a bearing and destroyed my motor. I had a shop fully rebuild it and he used a crankshaft from off the shelf that he rebuilt instead of my original crank. Only difference was that the coupler end was 18mm and mine was 20mm which is fine , I’m aware of the different coupler ends.
    However, my flywheel does not go on all the way on, it bottoms out before seating in the taper.
    I thought all 750 small pin cranks have the same flywheel end.
    Any help would be appreciated. Thanks.


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  2. #2
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: New 750 small pin crankshaft. Flywheel doesn’t fit.

    There is a different taper for '92 ONLY........so I've heard. I don't know that for a fact. You can use any 750 or 650 flywheel. The difference is a beveled area just behind the snout taper. Sometimes you have to grind a matching bevel into the backside of the flywheel so it can fully seat. I put a 650 ignition on a 750 once and DID NOT have to grind the flywheel but I know others have had to. Word of mouth is that there is the '92 only 750 crank.......then early small pin with 18mm coupler.....late 750 small pin with 20mm coupler....and then the big pin......so, 4 different versions!!
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  3. #3
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Re: New 750 small pin crankshaft. Flywheel doesn’t fit.

    Correct, early 750 cranks have a "shoulder" and different taper than later. They also had 18mm coupler thrreads.
    RCJS also doing business as WATCON
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  4. #4
    PWCToday Regular rc-hx's Avatar
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    Re: New 750 small pin crankshaft. Flywheel doesn’t fit.

    Thanks guys !
    Great info.
    This is the extra shoulder you’re talking about?
    Yep, the flywheel hits it before it can seat.



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  5. #5
    PWCToday Regular rc-hx's Avatar
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    Re: New 750 small pin crankshaft. Flywheel doesn’t fit.

    Quote Originally Posted by john zigler View Post
    Correct, early 750 cranks have a "shoulder" and different taper than later. They also had 18mm coupler thrreads.
    So John,
    Even if I ground a bevel into the flywheel so it could sit fully on the tapered section of the crank it wouldn’t work because the tapers are different?


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  6. #6
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    Re: New 750 small pin crankshaft. Flywheel doesn’t fit.

    received_449360462956419.jpeg

    That's the 92 flywheel backside. Unfortunate I need this one! But maybe ebay has one

    I don't think it would be unreasonable to ask the mechanic to make it right by either building up your og crank or buying a flywheel for you...
    Last edited by SkiMan104; 05-30-2022 at 12:34 PM.

  7. #7
    PWCToday Regular rc-hx's Avatar
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    Re: New 750 small pin crankshaft. Flywheel doesn’t fit.

    Quote Originally Posted by SkiMan104 View Post
    received_449360462956419.jpeg

    That's the 92 flywheel backside. Unfortunate I need this one! But maybe ebay has one

    I don't think it would be unreasonable to ask the mechanic to make it right by either building up your og crank or buying a flywheel for you...
    I see. Thanks for the pic.

    Yeah, it was he who swapped the cranks so I don’t think it will be a problem. First time I used him and he seems like a nice guy.


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  8. #8
    PWCToday.com Is My Home Away From Home Bruce in SB's Avatar
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    Re: New 750 small pin crankshaft. Flywheel doesn’t fit.

    I have machined out the “bevel” before and the main taper was the same
    Worked for me…
    "Thanks" to Chris Newmiller @ Newmiller Machine

  9. #9
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: New 750 small pin crankshaft. Flywheel doesn’t fit.

    Quote Originally Posted by Bruce in SB View Post
    I have machined out the “bevel” before and the main taper was the same
    Worked for me…
    That's what I was saying earlier. I know guys that have used a grinder to make that bevel.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  10. #10
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Re: New 750 small pin crankshaft. Flywheel doesn’t fit.

    Quote Originally Posted by rc-hx View Post
    So John,
    Even if I ground a bevel into the flywheel so it could sit fully on the tapered section of the crank it wouldn’t work because the tapers are different?


    Sent from my iPhone using Tapatalk
    I have not personally done this and do not know, but it looks as if others say they have.....
    RCJS also doing business as WATCON
    608-743-1305 9am to 5pm CST m-f
    email watcon@watcon.com

    Please visit our web site

    new parts / products / services www.watcon.com
    thank you

    Please check out and like WATCON on Facebook

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