RPMs suddenly out of whack

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  • chuck hahn
    Forum LongTimer
    Past Site Supporter
    • May 2009
    • 25917
    • Norman, Oklahoma
    #1

    RPMs suddenly out of whack

    Was on the way home from work on the 77 750. Was at the light and nothing for the next mile or so ahead of me, so I wanted to play a little. Got going and was screaming it at the higher end of the power band thru all gears..shifting at around 7500 or so.

    So when i cam to the corner light, the RPMs were now settling at around 3000 where they were idling at 1000 before hand. all the pipes were super hot at 1000 before my little "run" and seemed to be running very well. Had to readjust the idle back down and its running exactly the same as it was before hand..puzzling.

    No hanging idle or nothing else out of the ordinary. Best I can think is that maybe a small bit of whatever may have been sucked thru the carbs??? What do you guys think went down here???
    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.
    Tags: None
    • Steve
      GS Whisperer
      • Jun 2005
      • 35924
      • southwest oHIo
      #2
      Maybe you FINALLY worked all the little air bubbles out of the pilot circuit?

      .
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      #2 son: 1980 GS1000G
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        Comment

        • chuck hahn
          Forum LongTimer
          Past Site Supporter
          • May 2009
          • 25917
          • Norman, Oklahoma
          #3
          Well if the last 5 or 6 tanks of gas didnt purge them then I suspect your wrong...LOL
          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.

            Comment

            • Nessism
              Forum LongTimer
              GSResource Superstar
              Past Site Supporter
              Super Site Supporter
              • Mar 2006
              • 35783
              • Torrance, CA
              #4
              Intake system leak?
              Ed

              To measure is to know.

              Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

              Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

              Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

              KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

                Comment

                • GregT
                  Forum Sage
                  • Jul 2009
                  • 3541
                  • New Zealand
                  #5
                  What's the ignition trigger ? If it's a centrifugal advancer, I've seen similar symptoms when it's a bit sticky ie doesn't retard right back to the stop.

                    Comment

                    • chuck hahn
                      Forum LongTimer
                      Past Site Supporter
                      • May 2009
                      • 25917
                      • Norman, Oklahoma
                      #6
                      Yeah it has the mechanical advance governor behind the timing plate...so that will be looked at...thanks.
                      Last edited by chuck hahn; 09-06-2014, 12:29 PM.
                      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.

                        Comment

                        • 850 Combat
                          Forum Guru
                          Past Site Supporter
                          • Sep 2006
                          • 6018
                          • Spokane, WA, and Hampden, ME
                          #7
                          I was also going to suggest the mechanical advancer. I haven't had a Suzuki one give a problem, but I have had them wear on other brands, and develop a place on the slot where the pins on the weights can hang up.
                          sigpic Too old, too many bikes, too many cars, too many things

                            Comment

                            • Guest
                              #8
                              So, what's the deal? Any updates, Chuck?

                                Comment

                                • chuck hahn
                                  Forum LongTimer
                                  Past Site Supporter
                                  • May 2009
                                  • 25917
                                  • Norman, Oklahoma
                                  #9
                                  Didnt find anything out of sorts. Weights werent sticking and arent rusty. One of those odd things that I havent ever had happen before!! Hasnt repeated itself either. Still idling right at 1,000 from when i turned the idle down before. Very wierd.

                                  I am without any explanations. Plugs caps are good, good wire to cap connections, petcock flowing a good thick stream from the fuel nipple. no fuel line kinks...dont know.
                                  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.

                                    Comment

                                    • Guest
                                      #10
                                      Fugetaboutit and ride the h3ll out of it.

                                        Comment

                                        • chuck hahn
                                          Forum LongTimer
                                          Past Site Supporter
                                          • May 2009
                                          • 25917
                                          • Norman, Oklahoma
                                          #11
                                          Thats exactly what I am doing!!! I even took it on an out of the way road and ragged the helll out of it again and nothing..ran like it should and never repeated.........I will just call this an "incidental tune up" LOL
                                          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.

                                            Comment

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