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Mikuni VM Accelerator Pump Applications

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    Mikuni VM Accelerator Pump Applications

    Our GSs equipped Mikuni VM series carbs were never equipped with accelerator pumps but Mikuni did manufacture VM series accelerator pumps back in the 70s. IIRC Kawasaki KZ650's & KZ1000's VM28s were equipped with Mikuni OEM accelerator pumps and I have VM29 Smoothbore literature stating this item existed. I believe the kit included 4 new Float bowls with #1 & 2 connected & #3 & 4 connected with fuel line. The accelerator pump was attached to the #3 float bowl and attached to the throttle linkage with an adjustable shaft. The one I have seen was equipped with the telltale S/B 17mm nut on the bottom of the float bowl. Sorry I don't have a picture handy

    My question is about VM Accelerator Pump kit application:

    1) Did Mikuni produce one VM accelerator pump kit which was interchangeable betwenn VM26, VM28 & VM 29 Smoothbores

    2) Any idea what this item cost brand new? How about today?

    TIA
    Steve
    Last edited by srsupertrap; 11-19-2012, 10:50 AM.
    1979 GS1000E (44 Yrs), 1981 GPz550
    Departed: 1970 Yamaha R5A, 1971 R5B, 1975 Honda XL250, 1983 Suzuki PE175, 1983 CB1100F, 1983 BMW R100RS, 1992 ST1100

    #2
    I have had the Kaw set ( pumpers ) in my hands and as I remember things, the bowls and all are the same from the 26 and 29s are concerned..so that would tell me that they are interchangable.


    EDIT...I should mention the bike was my buddy back in Detroit..was a 76 kawasaki KZ900 I do believe.
    Last edited by chuck hahn; 11-19-2012, 11:58 AM.
    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


      #3
      Nothing found on Ebay with any KZ900 pumpers..but then again maybe my buddies were converted at some past point. I didnt have any luck finding any kits either.
      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
        I would doubt there was ever a kit available to the public to convert the VM's. I've seen and worked on the pump equipped Kawasaki version and it's not just the bowls you'd need, the operating mechanism for the pump has to be added to the cross shaft too.
        I'm not a Z expert but I have the impression they were maybe a one year only thing on the Z's.

        Comment


          #5
          Originally posted by chuck hahn View Post
          I have had the Kaw set ( pumpers ) in my hands and as I remember things, the bowls and all are the same from the 26 and 29s are concerned..so that would tell me that they are interchangable.


          EDIT...I should mention the bike was my buddy back in Detroit..was a 76 kawasaki KZ900 I do believe.
          Chuck,
          Do you recall whether the Kaw set ( pumpers ) had the 17mm drain nut on the bottom of the float bowl?
          1979 GS1000E (44 Yrs), 1981 GPz550
          Departed: 1970 Yamaha R5A, 1971 R5B, 1975 Honda XL250, 1983 Suzuki PE175, 1983 CB1100F, 1983 BMW R100RS, 1992 ST1100

          Comment


            #6
            The big nut was a 29 smooth bore only iitem

            Comment


              #7
              Mikuni sold an add-on accelerator pump kit back in the day - it allowed you to install this on a variety of carbs.

              Kawasaki KZ650 and KZ1000 models came with accelerator pumps in 79/80 on USA bikes ONLY. This (together with the reed value ports on the head) allowed Kawasaki to meet emissions standards although in reality they worked around the standards.

              A handful of VM29's were sold with accelerator pumps installed by the factory. I'm only aware of a handful of these ever being sold.

              Comment


                #8
                Its been a few years since i saw the bike but I could call James and ask him...Its in his basement right now.
                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


                  #9
                  VM29 float bowls are not interchangeable with VM26 or VM28 carbs.

                  THe carbs on the KZ1000's don't have the 17mm head head. These were only on the VM29's and very early Z1 VM28's (a different style carb).

                  Comment


                    #10
                    One of the z1r,r I recently purchased is equipped with 29 smoothbores with acc pump and the other one has 29s with no pump. I can take some pics if anyone wants.

                    Comment


                      #11
                      Originally posted by amxsteve View Post
                      One of the z1r,r I recently purchased is equipped with 29 smoothbores with acc pump and the other one has 29s with no pump. I can take some pics if anyone wants.

                      I would like to see pics of 29 smoothbores with acc pump
                      1979 GS1000E (44 Yrs), 1981 GPz550
                      Departed: 1970 Yamaha R5A, 1971 R5B, 1975 Honda XL250, 1983 Suzuki PE175, 1983 CB1100F, 1983 BMW R100RS, 1992 ST1100

                      Comment


                        #12
                        here ya go

                        Comment


                          #13


                          They are missing the rubber hose between the float bowls in the above picture...

                          Comment


                            #14
                            Originally posted by jeff.saunders View Post


                            They are missing the rubber hose between the float bowls in the above picture...

                            Much better pics. Are they worth much as I like my rs mikunis

                            Comment


                              #15
                              VM29's can fetch $600-$700 without the accelerator pump. I think a mint set in good working order would fetch more than a new set of RS34's...

                              Comment

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