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Mikuni VM Carb Interchange?

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    #1

    Mikuni VM Carb Interchange?

    A friend of mine asked me to take a look at his '77 Yamaha RD400. While it's a nice looking bike, it stalls at idle frequently.

    My question for y'all: Mr. Barr sells a nice kit of o-rings for the Mikuni VM carbs. Is there any reason to think his kit would work for the Yamaha installation?

    I'm sure reed valves and two stroke make for a host of different jetting configurations. However, It seems possible that the other parts may work.

    I already checked with Robert, unfortunately, he has never played with the Yamaha carb.

    Does anyone have any experience to share?

    Thanks, Alan
    '82 GS650G 27k
    '00 GZ250 5k "Pocket Hawg"
    ('98 GS500E 18k, new project - moved on to new home)
    '98 GSF1200 39k, new project, fixed the blown out spark plug, waiting on time
    '05 Moto Guzzi Nevada 750IE (the Pocket Hawg's days are numbered)
    Tags: None
    #2
    It would be a 76 actually. Wasnt built in 77. Anyway, heres the parts fiches. You may get parts faster by copy and pasting part numbers in the Ebay search box.

    1976 Yamaha RD400C OEM Parts, PartsFish.com
    https://www.partsfish.com/oemparts/l/yam/500419bbf8700209bc785573/1976-rd400c-parts
    Shop our large selection of 1976 Yamaha RD400C OEM Parts, original equipment manufacturer parts and more online or call at 800-964-1882
    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
      The RD400 was built from '76-'79

      There were very few O-rings for those carbs. I'd take them apart and then take inventory of what you need.
      Last edited by Nessism; 02-02-2018, 08:34 PM.
      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

        #4
        Doesnt show up on fiches for 77.......DT400 is there.
        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

          #5
          Shows it on the 78 model year though. Maybe i made my assumption based on it not being listed for 77...which may be an error on Partsfish.
          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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