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    Choke problem

    Hi
    I have a GS750 1977
    Every time I start with choke from cold it only revs to about 2500 only briefly I need to give it some throttle to keep it going
    I put my mates carbs on it and it revved up to 4000 which is normal
    Carbs have recently been thoroughly cleaned etc
    Any Ideas?
    thanks

    #2
    You need to be sure that the choke circuit is perfectly clear. There is a long brass tube at the base of the carb which sits in a long recess in the float bowl itself. This is the choke fuel supply. There are tiny holes in the brass tube which block up and there is a tiny orifice at the bottom of the recess in the float bowl which blocks up as well.
    1978 GS1085.

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

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      #3
      [QUOTE=Mafie
      Carbs have recently been thoroughly cleaned etc
      Any Ideas?
      thanks[/QUOTE]

      Sorry, bit they're not clean. Did you follow the tutorial, or just spray some carb cleaner here and there?
      If they were clean, you wouldn't have this issue
      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

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        #4
        As already mentioned.
        The problem wouldn't be present if the carbs were properly cleaned.
        VM carbs are quite simple in operation so it shouldn't be difficult to ensure all the passages are clear.
        Close attention needs to be made to the choke fuel pick-ups and also the pilot circuit.
        Mikuni Viton Choke Plunger Seat Renewal.
        VITON Choke plunger seals .KAWASAKI Z1,Z900,Z650,Z1000,Z1R,SUZUKI GS1000,GSXR,RF | eBay

        Air Corrector Jets for Mikuni VM 24, 26 and 28mm carbs .
        https://www.ebay.co.uk/itm/254380193...84.m1555.l2649



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          #5
          Go to Bikecliffs website for tutorials.

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            #6
            Link to BikeCliffs is n my signature. You want the VM Carburetor Rebuild Guide down along the right margin.
            Rich
            1982 GS 750TZ
            2015 Triumph Tiger 1200

            BikeCliff's / Charging System Sorted / Posting Pics
            Destroy-Rebuild 750T/ Destroy-Rebuild part deux

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              #7
              Originally posted by zed1015 View Post
              As already mentioned.
              The problem wouldn't be present if the carbs were properly cleaned.
              VM carbs are quite simple in operation so it shouldn't be difficult to ensure all the passages are clear.
              Close attention needs to be made to the choke fuel pick-ups and also the pilot circuit.
              Just to add to the mix I had the choke plunger seals replaced and the difference is night and day, if the carbs are 40 plus years old the seals will be shot. I totally recommend getting the seals replaced as they will leak by and make setting the carbs up more or less impossible.
              Jeff

              Living the dream...

              1980 GS1000 that has been modestly modified.

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