Cam lobe delamination

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  • Bartman
    XStremely XSive
    • May 2012
    • 200
    • Jefferson, Georgia

    #1

    Cam lobe delamination

    I checked my valve clearances tonight and I found that my #2 intake lobe looks to be delaminated.

    Check this picture out and tell me if this will be a problem?

    79 XS11
  • jetmechmarty
    Master of XSology
    • Nov 2003
    • 7765
    • Coldwater, Mississippi

    #2
    Pull it and measure it. There is a spec in the service manual. Picture is unclear. Not looking too good.
    Marty (in Mississippi)
    XS1100SG
    XS650SK
    XS650SH
    XS650G
    XS6502F
    XS650E

    Comment

    • crazy steve
      XS-XJ Guru MODERATOR
      • Jan 2009
      • 7932
      • Beautiful outer Yelm, WA

      #3
      Yep, that's a problem..... you need another cam.

      Yamaha doesn't say what the cams are made of; most are cast-iron then 'flame hardened' to a certain depth to resist wear. These may be plated with something compatible with the shim metal. In any case, if this surface is coming off, replace the cam. I'd throw away the shim too...
      Fast, Cheap, Reliable... Pick any two

      '78E original owner - resto project
      '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
      '82 XJ rebuild project
      '80SG restified, red SOLD
      '79F parts...
      '81H more parts...

      Other current bikes:
      '93 XL1200 Anniversary Sportster 85RWHP
      '86 XL883/1200 Chopper
      '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
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      Yep, can't leave nuthin' alone...

      Comment

      • Bikes
        Truly XSive
        • Oct 2014
        • 174
        • Coastal Maine

        #4
        I agree with Steve, no good, not to mention those little pieces went somewhere..
        Could have been because the bike sat for a long time..used to see it alot on cars that were only used in the summer.......
        Mark
        1980 xs1100g 3H5.......
        1992 Ducati 907ie
        2001 Moto Guzzi Jackal

        Comment

        • MPittma100
          XS-XJ Guru
          • Aug 2011
          • 2359
          • Atlanta, GA.

          #5
          Cam

          It will only get worse. Time for a replacement. May want to use assembly lube when putting back together. Check lobes and shims on other cam, chain, adjuster, etc. May want to consider a different brand of oil.

          When checking lobes on cam, use a micrometer or digital caliper. All lobes should be the same on each cam being measured.
          Last edited by MPittma100; 02-19-2015, 09:40 PM.
          1981 XS1100H Venturer
          K&N Air Filter
          ACCT
          Custom Paint by Deitz
          Geezer Rectifier/Regulator
          Chacal Stainless Steel Braided Brake Lines
          Chrome Front Rotor & Caliper Covers
          Stebel Nautilus Horn
          EBC Front Rotors
          Limie Accent Moves On In 2015

          Mike

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          • mrhammer2u
            XStremely XSive
            • Aug 2014
            • 472
            • Northern, NJ

            #6
            I'm selling mine on ebay. Will save you the $5 shipping of you buy through here.

            Rob - 79 SF

            Comment

            • Bartman
              XStremely XSive
              • May 2012
              • 200
              • Jefferson, Georgia

              #7
              I agree that the chrome is coming off and concerns me as far as metal bits floating around in the motor.....

              I have 3 other motors to pull from. So do I pull other cam and it's 4 shims??? then tighten and measure and then remove again to get the shim size needed, or is there a way to measure outside and get an educated guess as to what shim that I will need before putting back together?

              Way back when I did the first valve checking and shim replacement, I didn't realize that you can't rotate the crank without a shim in the bucket. This is the lobe that bumped the bucket back then. Back then I only used the shim tool. This time I am going to pull the cam and see all at one time.
              79 XS11

              Comment

              • bikerphil
                Master of XSology
                • Jan 2008
                • 8634
                • South Flori-DUH

                #8
                Originally posted by Bartman
                I agree that the chrome is coming off and concerns me as far as metal bits floating around in the motor
                Oil filter should catch them.
                2H7 (79) owned since '89
                3H3 owned since '06

                "If it ain't broke, modify it"

                Comment

                • DiverRay
                  Moderator
                  • Nov 2004
                  • 7603
                  • Star, IDAHO

                  #9
                  Bartman:
                  I have 3 other motors to pull from. So do I pull other cam and it's 4 shims??? then tighten and measure and then remove again to get the shim size needed, or is there a way to measure outside and get an educated guess as to what shim that I will need before putting back together?
                  No, use the shims that are in the bike. The cams should be very close, and the shims are for the valve lash. You will want to change the bucket and shim on the one valve, with one from the other head, though. DO NOT force the bucket into the head, if it will not go, try another bucket.
                  Ray Matteis
                  KE6NHG
                  XS1100 E '78 (winter project)
                  XS1100 SF Bob Jones worked on it!

                  Comment

                  • Bartman
                    XStremely XSive
                    • May 2012
                    • 200
                    • Jefferson, Georgia

                    #10
                    I pulled the extra cam tonight. I was already thinking about swapping any damaged buckets that I find on the intake side.

                    I Am a little nervous about getting it out of time. But I have read and reread the how to and maybe I can take apart and get it back together. Sure would hate to mess it up when it is running so good.
                    79 XS11

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                    • Bartman
                      XStremely XSive
                      • May 2012
                      • 200
                      • Jefferson, Georgia

                      #11
                      I know to torque all bolts, but do you put lock tight on the sprocket bolts? They don't have locking washers.
                      79 XS11

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                      • bikerphil
                        Master of XSology
                        • Jan 2008
                        • 8634
                        • South Flori-DUH

                        #12
                        Use blue Locktite if any, it can't hurt. I never use any and haven't had one come loose yet. <knock>
                        2H7 (79) owned since '89
                        3H3 owned since '06

                        "If it ain't broke, modify it"

                        Comment

                        • Bartman
                          XStremely XSive
                          • May 2012
                          • 200
                          • Jefferson, Georgia

                          #13
                          I got the new cam in tonight and after 4~5 rotations I checked the clearances and as I figured, I will have to change out some shims! So Saturday I'll run over to Gainesville motor sports and see if I get lucky.
                          79 XS11

                          Comment

                          • jetmechmarty
                            Master of XSology
                            • Nov 2003
                            • 7765
                            • Coldwater, Mississippi

                            #14
                            Originally posted by Bartman
                            I got the new cam in tonight and after 4~5 rotations I checked the clearances and as I figured, I will have to change out some shims! So Saturday I'll run over to Gainesville motor sports and see if I get lucky.
                            I went there last time. One of their mechanics traded with me, no charge.
                            Marty (in Mississippi)
                            XS1100SG
                            XS650SK
                            XS650SH
                            XS650G
                            XS6502F
                            XS650E

                            Comment

                            • Bartman
                              XStremely XSive
                              • May 2012
                              • 200
                              • Jefferson, Georgia

                              #15
                              Yep, last time they were very helpful.
                              I might take my "run lean" motor and see what it has in it. Tonight I took all of the shims out of the motor that has a hole in the block and none of them are what I need.
                              79 XS11

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