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  1. #1

    Join Date
    Dec 2006
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    need help with wrist pin and bearing

    got a problem with # 3 wrist pin and bearing on gp1200r,installing new 1300 pistons and jugs,first two went on no problems but #3 bearing is tight in top of connecting rod!can i sand it a little to make it looser?tried a different bearing and wrist pin but the same!what can i do?ANY INFO WOULD BE GREAT


  2. #2

    Join Date
    Nov 2005
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    North East Mo
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    You and me both I am curious to see the replys on this one I had / have the same problem also on mine number two was snug I took four hundred gritt sand paper and wrapped it around the wrist pin untill it fit tightly and turned it by hand untill it ground enough out to float freely.
    I am NOT recomending you to do it just telling you what I have done I got about fifteen hour on it know and am planning to pull it apart before spring and checking it and if its not smooth and pretty its getting replaced
    With a oem Yamaha no more rebuilds for me

  3. #3

    Join Date
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    was that on a cylinder that had that leaned out on you?

  4. #4

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    no it was a rebuild unit and was tight from day one

  5. #5
    Moderator Insanediego Joe's Avatar
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    Are you using a rebuilt crank?

    I had this happen tome one time. Turned out the small end of the rod was oblong. We had to return the crank to crank works and get another crank.

  6. #6

    Join Date
    Dec 2006
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    i was hoping for a easy fix

  7. #7

    Join Date
    Dec 2006
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    johnstown pa
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    no, it is a oem crank,but that is the cylinder that leaned out on me.

  8. #8
    Flying Scotsman's Avatar
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    I'm prety shure that would be a lapped finish I would not sand it.
    You want a microfinish on it.

  9. #9
    TRIPLE PIPES ARE 2-STROKE TURBOS allcool's Avatar
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    Nov 2005
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    s fl
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    What exactly do you mean by the bearing being tight?
    Is it tight to insert into the rod or does it spin tight or both?

    If the bearing doesn't fit right or spin right you must figure out why.

    Check for any burrs in the small end bearing surface causing tightness or the bearing to hang up.
    small burrs can be polished out with very fine crocus cloth

    Measure the small end of the rod in 6 spots to check for out of round
    12, 2, 4, 6, 8, and 10 o'clock positions, all measurements should be within .0001" iirr

    check the other small ends to compare measurements
    if it is out of round then polishing will not correct this.

    allcool

  10. #10

    Join Date
    Nov 2005
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    North East Mo
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    yes mine was a rebuild

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