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1980 gs550e - fuel tap / tank noise

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    1980 gs550e - fuel tap / tank noise

    I have a bike as above and when ever it gets near to reserve a tapping sound is heard
    in the tank?

    It must be vacuum pulses from the petcock creating this sound amplified through an emptying tank ?
    (Even with the tank beside the bike with a long line the sound is still present so it is not
    engine / frame.

    The bike has a fuel line to petcock and a vacuum pipe to carb 3. Standard RES and On only (no prime)
    The internals are fine and it works perfectly.

    Does anyone else have this ?
    I wonder if it is doing damage when i let the petrol level get low.

    I attach a diagram of my petcock - the original.
    it has no prime and to fit on my bike due to access the fuel and vacuum pipe must point forward or to the right not backwards.
    (Anyone know where i can get a petcock with prime as above ?)

    Petcock my one diagram.jpg
    Last edited by ukjules; 06-18-2017, 06:04 AM.
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 Suzuki GS550ET
    1977 Yamaha RD 250D
    1982 Kawasaki GPZ 750 R1
    1980 Suzuki GSX 250E

    #2
    if you have a tank gauge then it could be the float hitting the inside of the tank when the level gets low
    Last edited by Agemax; 06-17-2017, 05:28 PM.
    1978 GS1085.

    Just remember, an opinion without 3.14 is just an onion!

    Comment


      #3
      No tank guage , standard.
      It is the petcock and vacuum pumping ...
      I just wondered why only my bike does it ?
      Always has ... Always will.

      I am convinced all other 1980 GS
      With only Res / on on petcock must ?
      UKJULES
      ---------------------------------
      Owner of following bikes:
      1980 Suzuki GS550ET
      1977 Yamaha RD 250D
      1982 Kawasaki GPZ 750 R1
      1980 Suzuki GSX 250E

      Comment


        #4
        Try putting the lever to prime position and blocking the vac pipe?
        sigpic

        Don't say can't, as anything is possible with time and effort, but, if you don't have time things get tougher and require more effort.

        Comment


          #5
          Aha .... Yes no prime on this tap as per diagram
          it is the standatd one.

          It makes a rattling sound as it gets near to Res.
          Switch to Res disappears.
          Disappears when full too.

          I am just readying the bike for a " tour "
          and would so like a tap with prime but
          The feeds must point forward or inwards.

          I'll go as is as not an issue just a noise ?
          I can't see how others with same tap do t get it .
          UKJULES
          ---------------------------------
          Owner of following bikes:
          1980 Suzuki GS550ET
          1977 Yamaha RD 250D
          1982 Kawasaki GPZ 750 R1
          1980 Suzuki GSX 250E

          Comment


            #6
            I would love a petcock that did that. Most of the other '80 models got a petcock without a lever with a little nylon screw slot that was run (horizontal) or prime (vertical), no reserve. My tanks were in terrible shape so I got a '80 NOS tank for my '78. Does your petcock have a 50mm bolt spread? Mine looks like this (https://www.z1enterprises.com/petcoc...t-spacing.html), it is a KL number but is identical to the stock petcock.
            Last edited by OldVet66; 06-18-2017, 07:28 PM.
            '78 GS1000E, Dyna-S ignition, Dyna Green Coils, K&N pods, Delkevic SS 4-1 exhaust, Dynojet Stage 3 jet kit, Russell SS Brake Lines, Progressive suspension, Compu-Fire series Regulator 55402 and Advmonster cree LED headlight conversion.

            Comment


              #7
              For the 1980 gs550et - the petcock plate bolts from end to end is 50mm.

              On my original as per diagram (earlier in thread) there is no prime. Vacuum only which makes it hard to start
              after being left for a while. Also makes the sound in question when nearing reserve.

              I attach a petcock that i used on my last Europe trip borrowed when mine disintegrated.
              It is off a suzuki but i dont know what.
              50mm outside to outside so fitted fine but the pipes point the wrong way thus i had pipes
              coming out around the outside of the bike.
              It is however the type i need - has all the logical elements anyone using as bike needs when out
              on the open road. Why oh why are there not more of these types being made ?

              I need one like this but the pipes pointing forwards or near as.

              Non standard petcock but fits - pipes point wrong way 1.jpg
              UKJULES
              ---------------------------------
              Owner of following bikes:
              1980 Suzuki GS550ET
              1977 Yamaha RD 250D
              1982 Kawasaki GPZ 750 R1
              1980 Suzuki GSX 250E

              Comment


                #8
                And just for info - my standard one - with just on/off (no prime)
                but pipes pointing in the right way for use on my bike.

                Note - I think center to center is 44mm using m6 bolts
                to attach to tank.

                Petcock my one diagram 1.jpg
                Last edited by ukjules; 06-19-2017, 07:40 AM.
                UKJULES
                ---------------------------------
                Owner of following bikes:
                1980 Suzuki GS550ET
                1977 Yamaha RD 250D
                1982 Kawasaki GPZ 750 R1
                1980 Suzuki GSX 250E

                Comment


                  #9
                  Originally posted by ukjules View Post
                  (...) Why oh why are there not more of these types being made ?

                  I need one like this but the pipes pointing forwards or near as.

                  [ATTACH=CONFIG]51583[/ATTACH]
                  '79 550 petcock might be what you're looking for; see this post of mine for a few pictures. Not sure about the bolt spacing though, didn't take any measurements when I was cleaning mine.
                  #1: 1979 GS 550 EC "Red" – Very first Bike / Overhaul thread        New here? ☛ Read the Top 10 Newbie mistakes thread
                  #2: 1978 GS 550 EC "Blue" – Can't make it a donor / "Rebuild" thread     Manuals (and much more): See Cliff's homepage here
                  #3: 2014 Moto Guzzi V7 II Racer – One needs a runner while wrenching
                  #4: 1980 Moto Guzzi V65C – Something to chill

                  Comment


                    #10
                    This one might be interesting to you then. I was hoping it would fit mine but my measuring method was off a bit the first time and mine was 50mm. https://www.z1enterprises.com/petcoc...0h-kz750h.html
                    '78 GS1000E, Dyna-S ignition, Dyna Green Coils, K&N pods, Delkevic SS 4-1 exhaust, Dynojet Stage 3 jet kit, Russell SS Brake Lines, Progressive suspension, Compu-Fire series Regulator 55402 and Advmonster cree LED headlight conversion.

                    Comment


                      #11
                      Thanks for info.
                      @oldvet
                      That one looks ideal IF the petrol line can be moved to point
                      forward. But to me that looks exactly what everyone wants
                      for peace of mind on a long journey ( the prime function )
                      I'll email them for exact details.

                      @roeme
                      I'll read but if spacing right , pipes point forwards
                      and there is a prime it will do.
                      I'll add 1979 ones to my search.

                      That new one does look ideal though if it fits.
                      I'll see how helpful they are when I email them ...
                      Will report .
                      UKJULES
                      ---------------------------------
                      Owner of following bikes:
                      1980 Suzuki GS550ET
                      1977 Yamaha RD 250D
                      1982 Kawasaki GPZ 750 R1
                      1980 Suzuki GSX 250E

                      Comment


                        #12
                        I have emailed Z!enterprises about that petock.

                        If it is 50mm outside of hole to outside of other hole
                        (44mm center to center near as damn it) and if the vacuum pipe can be turned to point forward.

                        If this is so - this looks good.

                        Do comment if anyone else know "the" place for petcocks , but petcocks with a prime function !
                        and pipes pointing forward or in.

                        I attach pic of said petcock non standard petcock .jpg
                        UKJULES
                        ---------------------------------
                        Owner of following bikes:
                        1980 Suzuki GS550ET
                        1977 Yamaha RD 250D
                        1982 Kawasaki GPZ 750 R1
                        1980 Suzuki GSX 250E

                        Comment


                          #13
                          I've not heard of taps causing noise and wonder if the diaphragm 'panting' back and forth wasn't the problem that started back on your last trip. Restricting down the vac hole orifice will control that, are the vac pipes in the right place on the carbs?
                          What about a Pingle? just a straight non vacuum tap?
                          Sorry, previously I didn't realise you didn't have 'prime' position.
                          These vac taps a serious nuisance when they get older plus they a pest when trying to restart when the bike's been standing. When I open mine next time I will look to see if I can modify the thing so that it's only on and offable, moins vac.
                          sigpic

                          Don't say can't, as anything is possible with time and effort, but, if you don't have time things get tougher and require more effort.

                          Comment


                            #14
                            You are right , that panting in the end broke the
                            petcock internals causing petrol to flood
                            into cylinder 2.i am sure of this.
                            I am concerned to start trip 2 with exactly the same issue
                            albeit being in its infancy.

                            It is definitely the tap, the panting vacuum.
                            I can put the tank 6ft from the bike with a long line
                            and the petcock rattles away echoed by the tank.
                            Clank clank clank ...

                            I have one that works fine but the pipes point the wrong way.
                            This is the one I got in Amsterdam with a prime.

                            Vacuum goes to cylinder 2.

                            Wonder if the vacuum pipe is sealed well enough ?
                            Shall I remove tank side and block off and try ?
                            Someone else must have had this clanking ?
                            UKJULES
                            ---------------------------------
                            Owner of following bikes:
                            1980 Suzuki GS550ET
                            1977 Yamaha RD 250D
                            1982 Kawasaki GPZ 750 R1
                            1980 Suzuki GSX 250E

                            Comment


                              #15
                              The diaphragm isn't designed to flap back and forth like that it will knacker out in no time. you must find out why you're losing vacuum in cycles.
                              sigpic

                              Don't say can't, as anything is possible with time and effort, but, if you don't have time things get tougher and require more effort.

                              Comment

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