What is this?

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  • Hap Call
    • Feb 2026

    #1

    What is this?

    Anybody know what this is? Is it for the 8 valve motor?



    Hap
  • robinjo

    #2
    Re: What is this?

    Originally posted by Hap Call
    On Dennis Kirk the part # is superceded by this:

    Part Number: 09263-25008
    Description: RN 25X31X20 BRG
    Price: $11.79

    It seems it's a roller needle bearing

    or did you already know that?

    Comment

    • brs127s

      #3
      Hap,

      I can't think of anywhere in the top end for a bearing such as that, unless it goes in the con-rod for the wristpin. My 850 has no such bearings. I do remember such a bearing when I rebuilt my TS125 dirt bike for the con-rod. I looked on bike bandit and couldn't find anything that size. I did notice that the RN in front of the size may siginify where it is located. In all the 1100 diagrams, the crank end of the con-rods all had bearings that began with RN. Maybe it doesn't actually fit an 1100.

      Comment

      • gtsg01

        #4
        Hap

        I believe that this is the bearing that goes between the crankshaft and the gear on the starter clutch.

        There were originally two bearings about half as wide installed. When I replaced the starter clutch and rotor on my GK, the parts fiche listed the wide bearing as superceding the two narrow ones.

        I have had that bearing in my motor for about four years without any problems.

        The number Robinjo listed is the same as listed on Bike Bandit for the GK. I am beginning to think that the rotating assembly, starter, starter clutch, clutch and ignition rotor are the same whether shafted or chained.

        Comment

        • SqDancerLynn1

          #5
          No! It's the muffler bearing

          Comment

          • Anonymous

            #6
            Originally posted by SqDancerLynn1
            No! It's the muffler bearing
            I already knew that 8) 8)

            Comment

            • gtsg01

              #7
              The muffler bearing is much larger and comes with different Left and Right side part numbers!

              Sheeesh!

              Comment

              • saaz

                #8
                It is the starter clutch bearing, 2 are listed on bikebandit. Probably a common part for a few of the motors as I looked up a GS1100ET.

                Comment

                • Clone

                  #9
                  2 questions:
                  WHY would anyone buy a simple rollerbearing for 10 bucks off ebay?
                  WHAT the h##l does "NOS" stand for? I see it all over parts on ebay. :?

                  Comment

                  • jimcor

                    #10
                    The later roller muffler bearing replaced the framis bushing that was tested on some pre-production types.

                    Clone, NOS= New Old Stock (or $hit) It's the stuff that has been (so they say... :roll: ) 'lovingly preserved through the years' for later generations. Which is marketing for 'Thank God we can unload this crap and recoup some of our investment.'

                    Comment

                    • SqDancerLynn1

                      #11
                      NOS====== New Old Stock
                      NOS= slang= Nitrous

                      Comment

                      • Clone

                        #12
                        I'm familiar with the nitrous oxide=NOS one, but not the other. Thanks

                        Comment

                        • Hoomgar

                          #13
                          NOS ain't always bad, some of those parts have saved my butt when they are no longer available anywhere but junk yards. You just have to make sure you get a good look at what your buying before you commit.

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