Must have lost my mind, temporarily I hope!

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  • 1978GS750E
    Forum Sage
    Past Site Supporter
    Super Site Supporter
    • Apr 2016
    • 1244
    • Lexington, KY

    #1

    Must have lost my mind, temporarily I hope!

    Cannot believe that I just agreed to buy another old bike. This one is a 1980 Honda CB750K with 19K on the speedo. Runs rough but has a new rectifier and battery. Cosmetically it is in fair condition. I guess now I have a winter project! Will post pics when I get it home this weekend. At least it has all the major parts. Anything that these old Hondas need checked out that other brands do not?
    Ron
    '78 GS1000E, '79 GS850G, '82 GS1100E, 2022 Triumph Tiger 660 Sport
  • steve murdoch
    Forum Guru
    Past Site Supporter
    • May 2004
    • 8492
    • St. Catharines, On.

    #2
    http://www.cb750c.com/ is a good website for the DOHC Honda.
    A lot of crossover between the C, K and F models.

    Another great site for parts and info is https://www.motorcycleproject.com/

    A lot of those bikes had starter clutch issues.
    3 bolts under the left side cover that need re-tightening.
    Last edited by steve murdoch; 10-11-2018, 11:53 AM.
    2@ \'78 GS1000

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    • chuck hahn
      Forum LongTimer
      Past Site Supporter
      • May 2009
      • 25925
      • Norman, Oklahoma

      #3
      Charging issues ( if not due to R/R issues ) will most likely be the rotor windings which are under the right side cover. Check wear marks on the brushes too. If the rotor is the issue once you OHM it out get ahold of Custom Rewind in Birmingham Alabama. Kirk did one for me and it was back within a week.
      MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
      1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

      NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


      I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

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      • chuck hahn
        Forum LongTimer
        Past Site Supporter
        • May 2009
        • 25925
        • Norman, Oklahoma

        #4
        This page with its links may be of use to you...


        Found these a while back and the Admin over on CB750C.com gave me permision to share. They are broke down in chapters for easier downloading. Later model addendums and specific wiring diagrams are at the bottom. 1979 through 1982 Honda CB750K/C/F/SC Service Manual U.S. version. Chapter 1...
        MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
        1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

        NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


        I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

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        • 1978GS750E
          Forum Sage
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          • Apr 2016
          • 1244
          • Lexington, KY

          #5
          Thanks for the info! The bike is "supposed" to have a new rectifier and has a new battery.....we will see when I pick it up tomorrow. I know that the pods are coming off and the stock airbox is going back on. The PO said he recently added the pods but did not change anything in the carbs??? Needs some work on the header (paint) and has a valve cover gasket leak, which will be replaced when the valves are adjusted anyway. As with any old "new" bike, I've got a long list of things to check before even attempting to get it out for a test ride! At least the price was right. Hopefully I will get it home with enough light to take some pictures to post.

          Thanks again for the info!
          Ron
          '78 GS1000E, '79 GS850G, '82 GS1100E, 2022 Triumph Tiger 660 Sport

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          • 1978GS750E
            Forum Sage
            Past Site Supporter
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            • Apr 2016
            • 1244
            • Lexington, KY

            #6
            Finally got the winter project home. Here is a pic.IMG_0117.jpg

            Still cannot figure out why my pictures are always upside-down or sideways!!!!
            Ron
            '78 GS1000E, '79 GS850G, '82 GS1100E, 2022 Triumph Tiger 660 Sport

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            • Rich82GS750TZ
              Forum Guru
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              Super Site Supporter
              • Jun 2018
              • 5585
              • Mifflinburg, PA / Land of Tar & Chip

              #7
              Links

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              • LAB3
                Forum Sage
                Past Site Supporter
                • Mar 2018
                • 3496
                • No fixed address

                #8
                Looks like a good starting point, those are fetching good money these days.
                2001 Kawasaki Voyager XII (Current bike)
                1982 GS450txz (former bike)

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                • 1978GS750E
                  Forum Sage
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                  • Apr 2016
                  • 1244
                  • Lexington, KY

                  #9
                  Gotta de-rust the tank and then get her running good. The PO did not know anything about bikes and inherited it, so I got a deal...….I hope! Probably just gonna flip it, but who knows....4 bikes is not too many is it?
                  Last edited by 1978GS750E; 10-14-2018, 12:14 PM.
                  Ron
                  '78 GS1000E, '79 GS850G, '82 GS1100E, 2022 Triumph Tiger 660 Sport

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                  • 1978GS750E
                    Forum Sage
                    Past Site Supporter
                    Super Site Supporter
                    • Apr 2016
                    • 1244
                    • Lexington, KY

                    #10
                    Got the tank cleaned out today. Did a quick clean of the carbs, removing lots of rust! Cleaned the petcock. Put it all back together with an inline filter, just in case! Put the battery in it and...?.."IT''S ALIVE"! Started right up and idled a little high but so far it looks like a deal! What I thought was a valve cover leak looks to be a tach cable leak. Got a couple days off work so I'm hopeful that I can get some more done to it. Going to get some of the ugly off it tomorrow. Anybody need some rusted crash bars? What about rusted highway pegs?
                    Ron
                    '78 GS1000E, '79 GS850G, '82 GS1100E, 2022 Triumph Tiger 660 Sport

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                    • steve murdoch
                      Forum Guru
                      Past Site Supporter
                      • May 2004
                      • 8492
                      • St. Catharines, On.

                      #11
                      What exhaust is on it.
                      Same as the GS line, some of the DOHC aftermarket systems are worth some good coin.
                      2@ \'78 GS1000

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                      • 1978GS750E
                        Forum Sage
                        Past Site Supporter
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                        • Apr 2016
                        • 1244
                        • Lexington, KY

                        #12
                        It has a black Mac 4 into1 that needs some paint badly! My GS has the original exhaust so I will not be swapping those! Have to get the crash bar brackets(homemade) off, the airbox installed, and it needs a right rear turn signal bracket and a choke cable, then it will be back into almost stock form.
                        Ron
                        '78 GS1000E, '79 GS850G, '82 GS1100E, 2022 Triumph Tiger 660 Sport

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