Announcement

Collapse
No announcement yet.

1979 gs850 noise

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    1979 gs850 noise

    Ok so here it goes, I got my carbs all straightened out and shes running good but I seem to have a problem. When shes at a hot idle I can hear a knocking sounds but it doesnt do it every revolution. So what could it be? It makes two knocks then stops for one second then two knocks and then stops for a second and it keeps doin that while its at idle. What could it be??
    Tags: None
    #2
    Cam Chain?

    Might be a tight spot in your cam chain, my old 750c made a noise like that it's whole life, I think now, later, affecting it's so-so power availability. Never let me down, tho-broke my heart when my son totalled it.
    sigpicSome of the totally committed probably should be.
    '58 + '63 Vespa 150's' (London, GB/RI, US)
    '67 X6 T20 ('67 Long Beach, Ca.- misty-eyed)
    '71 Kaw. A1-ugh ('71 SF, CA- worked @ Kaw dlr)
    '66 Yam. YL1('72 SF-commuter beater)
    '73 Kaw. S2A-2Xugh ('73 SF-still parts slave)
    '78 GS 750C ('77 SF-old faithful-killed by son)
    '81 KZ 750E ('81 SF-back to Kaw. dlr)
    '81 GS 650G ('08 back to NE&ME- (project)
    '82 GS '82 (2) GS650GZ, L, Middlebury, G current

    Comment

      #3
      maybe post a you tube video with sound and it will be clearer as to what you are hearing..
      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

        #4
        Clutch?

        Narrow down where it's coming from
        1978 GS 1000 (since new)
        1979 GS 1000 (The Fridge, superbike replica project)
        1978 GS 1000 (parts)
        1981 GS 850 (anyone want a project?)
        1981 GPZ 550 (backroad screamer)
        1970 450 Mk IIID (THUMP!)
        2007 DRz 400S
        1999 ATK 490ES
        1994 DR 350SES

        Comment

          #5
          Assuming the carbs are in sync, sounds like it may be a classic example of a knock caused by camshaft end float.

          It's fairly common on early 850s and 750s, and it's completely harmless.

          The fix is rather involved, and again, the noise is harmless, but here is it anyway.:
          http://bwringer.com/gs/cam_end_float_mod.pdf
          1983 GS850G, Cosmos Blue.
          2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
          2015 Yamaha FJ-09, Magma Red Power Corrupts...
          Eat more venison.

          Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.

          Celeriter equita, converteque saepe.

          SUPPORT THIS SITE! DONATE TODAY!

          Co-host of "The Riding Obsession" sport-touring motorcycling podcast at tro.bike!

          Comment

            #6
            Yep, goin' with bwringer on this one. If it goes away by the time you get the engine up to about 1500 rpm, it's likely cam end float.

            My wife's bike came with that 'feature' already installed, still runs well over 20,000 miles later. Nothing to worry about.

            .
            sigpic
            mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
            hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
            #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
            #2 son: 1980 GS1000G
            Family Portrait
            Siblings and Spouses
            Mom's first ride
            Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
            (Click on my username in the upper-left corner for e-mail info.)

            Comment

              #7
              i bet it's the clutch basket loose springs quandary that is so common
              not the cam end float

              Comment

                #8
                Does the noise go away with the clutch pulled in?
                http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                Life is too short to ride an L.

                Comment

                  #9
                  Mine does the same thing. Rpm's over 1500 and it goes away. I'm dealing with it considering what the fix would be.
                  1979 GS850G
                  2004 SV650N track bike
                  2005 TT-R125 pit bike
                  LRRS #246 / Northeast Cycles / Woodcraft / Armour Bodies / Hindle Exhaust / Central Mass Powersport

                  http://s327.photobucket.com/albums/k443/tas850g/

                  Comment

                    #10
                    I have no clue whats wrong with your bike so I'll just sip my beer and agree with bwringer and steve.

                    Comment

                      #11
                      Hi,

                      If it is cam end float, I've heard here that installing your half moons backwards might quiet down the engine at idle. Some like installing them backwards anyway just so they don't pop out and make a mess.


                      Thank you for your indulgence,

                      BassCliff

                      Comment

                      Previous template Next
                      Working...
                      X