Piston pin size 750
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  1. #1
    PWCToday Newbie
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    Piston pin size 750

    I recently purchased a js750 motor it seems to have very small piston pins I'm not sure what it means when everybody says small pin and big pin I have come across three different pin sizes in three different 750 if anybody else has had this problem I've ordered pistons for a small pin motor and the the Piston pins are still too big for the Piston pins I have for this motor the problem is I do not know what the motor is or what it came out of but the on the block it says js750
    Attached Images Attached Images

  2. #2
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    Re: Piston pin size 750

    One of the other motors cam from a ss sport

  3. #3
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Re: Piston pin size 750

    there are only two piston pin sizes.

    20mm (small pin), or 22mm (Big pin)

    The engine in your picture is a small pin 750. If you ordered small pin pistons, and they do not fit, you got the wrong ones.

    One other possibility, someone has hacked together a crank, with smaller pin rods from another application.
    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

  4. #4
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    Last edited by Raen; 09-20-2020 at 11:28 AM.

  5. #5
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    Re: Piston pin size 750

    I'm going to go get the correct tool to measure all three maybe somebody could help me out and thanks for the reply

  6. #6
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    Re: Piston pin size 750

    20200920_135304_HDR.jpg
    The smallet one is what i need

  7. #7
    PWCToday Newbie
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    Re: Piston pin size 750

    20200920_135304_HDR.jpg
    The smallet one is what i need

  8. #8
    PWCToday.com Is My Home Away From Home
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    Re: Piston pin size 750

    smaller one on the right or in the middle?
    use a ruler to measure.

  9. #9
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    Re: Piston pin size 750

    Looks like 18mm 20mm 22mm

  10. #10
    Attention ***** PWCToday.com Is My Home Away From Home JonnyX2's Avatar
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    Re: Piston pin size 750

    Frankencrank?
    Quote Originally Posted by Firebird A/C&Heating View Post
    OMG.....Rules for 550 vintage ski class...550 ski riders do not conform to any kind of rules. That is why you are riding a 550 ski in the first place. Rules suck....
    PS...the rule book will be in my 550 pump
    Quote Originally Posted by WB1994
    Listen , stop your cryin' , its only an X2.

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