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GS850GT - Not Running Right, Possibly Wrong Carb??

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    #1

    GS850GT - Not Running Right, Possibly Wrong Carb??

    Hi All

    I am posting this on behalf of my brother who has a Custom trike which has an GS850GT engine fitted..

    Its having terrible running problems, he had some one come and look at the bike and the boots were leaking so he ordered new boots based on the engine number and when they came the inlet was too big for the carbs, he has since ordered other boots and they fit much better so he is starting to wonder if it has the wrong carbs on it (would carbs from a different GS still work?). He has had it running fine on tick over but he took it out today and it was terrible, it sounds like its over fueling or too much air rather than not enough (its spluttering rather than cutting out).

    I have posted a few pics below and i have a video which i will try and get on here of it ticking over.






















    Any help would be appreciated, because its driving him nuts

    Thanks
    Tags: None
    #2
    Click picture for video



    Thanks

    Comment

      #3
      Somebody has adapted Kawasaki slide carbs to the bike

      Is there a pumper hanging down on the #2 carb float bowl?

      I've never heard of ordering by engine number
      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

        #4
        That is an 80' engine and should have CV Carbs. Ditch the VM's, they ain't ever gonna' fit right ever (unless you change the head to a 79', which I have if you need one)

        Comment

          #5
          Did the bike run well before?

          What has been done other than new carbs boots?
          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

            #6
            Hi all thanks for comments so far!

            No the bike has Never run right i can get it to tick over nicely and move off lovely but wind her up and she splutters, but if you give her full throtle she goes like stink!! So its just mid range she doesnt like?!?

            All the carbs have been cleaned and look in good condition only thing i havent done is new jets and test the is a vacuum pipe on carb 2 any ideas????

            Many thanks guys

            (Posted by Chris's brother, Mark)
            Last edited by Guest; 06-16-2013, 05:02 PM.

            Comment

              #7
              There is a code on the Carb which is 47020, can this help ID the carb, i have looked all over on the internet and i cant find it, i found a spreadsheet with all the GS carbs on there and there was none listed as 47020, if its of another bike can you help idetify it please?

              Thanks

              Comment

                #8
                My brother has now managed to find the correct carb for the engine in a local breakers yard so fingerst crossed the problem will go away

                Comment

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