How do I identify what cylinder head i have

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  • GTXS1100
    XStremely XSive
    • Jun 2010
    • 224
    • Columbia MO

    #1

    How do I identify what cylinder head i have

    I have a burnt valve in my engine and i found an extra cylinder head in my shop but Im not sure what motor it came off of. I know that the older heads had bigger valves. I have a motor off of a 78-79 on my bike now and want to keep it the same but I have to do what I have to do to get my bike going. Just wondering if anyone knows off the top of their heads how to tell the difference. Any advice will be greatly appreciated. Thanks
    80 XS1100G Black Betty (Daily Driver)
    79 XS1100SF (Buddys Project)
    82 XJ750 Maxim (Fathers Bike)
    81 CB750F SS (Buddys Project)
    06 GSX600F Sold! (Was Mine)
    81 XS1100 Failed Bobber Project (Mine)
    81 XS1100 Parts (Mine)

    Grip it, Rip it, and Stick it!!!
  • jetmechmarty
    Master of XSology
    • Nov 2003
    • 7763
    • Coldwater, Mississippi

    #2
    Bigger valves came on the '80 & '81. FSM has the specs. That and a caliper should get you to the answer.
    Marty (in Mississippi)
    XS1100SG
    XS650SK
    XS650SH
    XS650G
    XS6502F
    XS650E

    Comment

    • GTXS1100
      XStremely XSive
      • Jun 2010
      • 224
      • Columbia MO

      #3
      So would it be better to put an 80-81 head on a 78-79?
      80 XS1100G Black Betty (Daily Driver)
      79 XS1100SF (Buddys Project)
      82 XJ750 Maxim (Fathers Bike)
      81 CB750F SS (Buddys Project)
      06 GSX600F Sold! (Was Mine)
      81 XS1100 Failed Bobber Project (Mine)
      81 XS1100 Parts (Mine)

      Grip it, Rip it, and Stick it!!!

      Comment

      • jetmechmarty
        Master of XSology
        • Nov 2003
        • 7763
        • Coldwater, Mississippi

        #4
        Originally posted by GTXS1100
        So would it be better to put an 80-81 head on a 78-79?
        No, it would not. With the 78/79 cam, I'm not sure the pistons won't hit the valves. Ignition is set up for a different cam profile. Find the correct cylinder head or replace your valve.
        Marty (in Mississippi)
        XS1100SG
        XS650SK
        XS650SH
        XS650G
        XS6502F
        XS650E

        Comment

        • GTXS1100
          XStremely XSive
          • Jun 2010
          • 224
          • Columbia MO

          #5
          I think im just going to swap the motor with a 78 i have.
          80 XS1100G Black Betty (Daily Driver)
          79 XS1100SF (Buddys Project)
          82 XJ750 Maxim (Fathers Bike)
          81 CB750F SS (Buddys Project)
          06 GSX600F Sold! (Was Mine)
          81 XS1100 Failed Bobber Project (Mine)
          81 XS1100 Parts (Mine)

          Grip it, Rip it, and Stick it!!!

          Comment

          • GTXS1100
            XStremely XSive
            • Jun 2010
            • 224
            • Columbia MO

            #6
            This is want I was talking about. Does anyone on here watch Andys motorcycle obsesion XS1100 Basket Case? He talks about using an 81 head with big valves and using the 78-79 cams? Anyone have an opinion on this?

            80 XS1100G Black Betty (Daily Driver)
            79 XS1100SF (Buddys Project)
            82 XJ750 Maxim (Fathers Bike)
            81 CB750F SS (Buddys Project)
            06 GSX600F Sold! (Was Mine)
            81 XS1100 Failed Bobber Project (Mine)
            81 XS1100 Parts (Mine)

            Grip it, Rip it, and Stick it!!!

            Comment

            • jetmechmarty
              Master of XSology
              • Nov 2003
              • 7763
              • Coldwater, Mississippi

              #7
              Andy is pretty much up on this. Where he has gone, you may follow. He's on FB XS1100 Nation.
              Marty (in Mississippi)
              XS1100SG
              XS650SK
              XS650SH
              XS650G
              XS6502F
              XS650E

              Comment

              • 3Phase
                XS-XJ Super Guru
                • May 2008
                • 5529
                • Simi Valley, CA

                #8
                Originally posted by GTXS1100
                So would it be better to put an 80-81 head on a 78-79?
                GT, the '80/'81 heads have larger combustion chambers along with the larger valves so the pistons have higher crowns to maintain the compression ratio.

                You can use an '80/'81 head with flatter '78/'79 pistons but the compression won't be right and it won't be much fun to ride.

                The cams won't make any difference. With the late-model head and early-model pistons, the valves can't even come close to touching the pistons.

                Going the other way and using the later pistons with the early head works too but there's almost no room for error with the piston-to-valve clearance.
                -- Scott
                _____
                ♬
                2004 ST1300A: No name... yet
                1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
                1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
                1979 XS1100SF: "Bush" W.I.P.
                1979 XS1100F: parts
                2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk" It's DEAD, it's not just resting. It is an EX cycle.
                ♬

                Comment

                • GTXS1100
                  XStremely XSive
                  • Jun 2010
                  • 224
                  • Columbia MO

                  #9
                  The heads i have that are good are all small valves. I checked them earlier tonight. I did order the big bore kit from ebay this morning. So the motor thats on my bike will get completely redone someday. For now im planning on swapping out a stock 78 i knew ran a few years ago. Thanks for all the help guys. Ill keep you updated on the bike.
                  80 XS1100G Black Betty (Daily Driver)
                  79 XS1100SF (Buddys Project)
                  82 XJ750 Maxim (Fathers Bike)
                  81 CB750F SS (Buddys Project)
                  06 GSX600F Sold! (Was Mine)
                  81 XS1100 Failed Bobber Project (Mine)
                  81 XS1100 Parts (Mine)

                  Grip it, Rip it, and Stick it!!!

                  Comment

                  • GTXS1100
                    XStremely XSive
                    • Jun 2010
                    • 224
                    • Columbia MO

                    #10
                    Update on my bike

                    Heres a short video i shot today on my bike progress. Got the motor all put in and painted and new exhaust. Hope you all like it.

                    80 XS1100G Black Betty (Daily Driver)
                    79 XS1100SF (Buddys Project)
                    82 XJ750 Maxim (Fathers Bike)
                    81 CB750F SS (Buddys Project)
                    06 GSX600F Sold! (Was Mine)
                    81 XS1100 Failed Bobber Project (Mine)
                    81 XS1100 Parts (Mine)

                    Grip it, Rip it, and Stick it!!!

                    Comment

                    • Schming
                      XS-XJ Guru
                      • Jul 2009
                      • 2070
                      • Pittsburgh,PA

                      #11
                      Lookin' & Sounds Good !!!

                      Good Job !!!
                      1980 XS1100G "Dolly G" Full Dresser (with a coat of many colors )
                      1979 XS1100SF (stock-euro mods planned)
                      1984 XV700L Virago (to be hot-modded)
                      1983 XJ750MK Midnight Maxim (semi-restored DD)
                      1977 XS650D ( patiently awaiting resto)

                      Sometimes it takes a whole tank of gas before you can think straight.

                      Comment

                      • GTXS1100
                        XStremely XSive
                        • Jun 2010
                        • 224
                        • Columbia MO

                        #12
                        Anyone know where to find the Schrader valve for the top of the forks on an 80G i think the part number is 3H5-23190-00-00. Mine is broken and makes it hard to get air in it. Ive looked all over ebay and can find the caps but no air valve.
                        80 XS1100G Black Betty (Daily Driver)
                        79 XS1100SF (Buddys Project)
                        82 XJ750 Maxim (Fathers Bike)
                        81 CB750F SS (Buddys Project)
                        06 GSX600F Sold! (Was Mine)
                        81 XS1100 Failed Bobber Project (Mine)
                        81 XS1100 Parts (Mine)

                        Grip it, Rip it, and Stick it!!!

                        Comment

                        • Schming
                          XS-XJ Guru
                          • Jul 2009
                          • 2070
                          • Pittsburgh,PA

                          #13
                          Originally posted by GTXS1100
                          Anyone know where to find the Schrader valve for the top of the forks on an 80G i think the part number is 3H5-23190-00-00. Mine is broken and makes it hard to get air in it. Ive looked all over ebay and can find the caps but no air valve.
                          I may have an extra one.

                          I'll check and let ya know asap.
                          1980 XS1100G "Dolly G" Full Dresser (with a coat of many colors )
                          1979 XS1100SF (stock-euro mods planned)
                          1984 XV700L Virago (to be hot-modded)
                          1983 XJ750MK Midnight Maxim (semi-restored DD)
                          1977 XS650D ( patiently awaiting resto)

                          Sometimes it takes a whole tank of gas before you can think straight.

                          Comment

                          • Schming
                            XS-XJ Guru
                            • Jul 2009
                            • 2070
                            • Pittsburgh,PA

                            #14
                            Yep got one.

                            PM me your address and I'll get it to ya
                            1980 XS1100G "Dolly G" Full Dresser (with a coat of many colors )
                            1979 XS1100SF (stock-euro mods planned)
                            1984 XV700L Virago (to be hot-modded)
                            1983 XJ750MK Midnight Maxim (semi-restored DD)
                            1977 XS650D ( patiently awaiting resto)

                            Sometimes it takes a whole tank of gas before you can think straight.

                            Comment

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