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Carbie Jetting after Rebore

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    #1

    Carbie Jetting after Rebore

    Gooday

    Approx 4 months ago I fitted the V&H street megaphone to my 1982 GS 1100ez. I followed the V&H jetting recommendations of 122.5 for the mains and 47.5 for the pilots and removed air filter lid. I live in West Australia so mainly ride at sea level with a warm climate, the bike ran great with no problems. I really love the pipes and very happy with the purchase.

    I've just had to do a top engine rebuild (2mm oversize) and the bike is now 1133cc , so it's basically the size of the GS 1150 engine. I referred to the V&H Jetting recommendations for the GS 1150 and swapped over to the larger main jets of 125.0 for 1 & 4 and 127.5 for 2 and 3. The V&H jetting recommendations didn't mention anything about changing the pilot jets so i left the 47.5's in from the 1100 jetting. The bike runs nice from about 3,000rpm up but can cough and splutter a bit when taking off and down low. My question is should i be using the stock 1150 pilot jets which are smaller then the 47.5's or should i be using a different size altogether. It seemed funny that V&H recommend a chang in the pilot jets for the 1100 but not the 1150, was this a mistake? The bike is completely stock in every other way. Any help you could give would be appreciated.

    Thanks

    Richard
    Tags: None
    #2
    Which needle jets are you using? Stock, Suzuki used different pilot jets depending on which needle jet along with different jet needles.
    I personally would just drop down to the 45 pilot jets and see if that cures most of the ills to begin with. Others will have some other options/ideas perhaps.

    Comment

      #3
      yes i'm using stock needle jets

      Comment

        #4
        Originally posted by carvan40 View Post
        Gooday

        Approx 4 months ago I fitted the V&H street megaphone to my 1982 GS 1100ez. I followed the V&H jetting recommendations of 122.5 for the mains and 47.5 for the pilots and removed air filter lid. I live in West Australia so mainly ride at sea level with a warm climate, the bike ran great with no problems. I really love the pipes and very happy with the purchase.
        That's interesting (to me) because I bought my 1100EZ with V&H Street Megaphone with stock airbox with no lid. I thought it was just lost and planned on replacing it but went with APE pods instead (and rejetting). Runs great.
        1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

        2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

        Comment

          #5
          Come on guy's surely there's more people out there that can offer up suggestions.

          Comment

            #6
            They'll chime in, mate, give 'em a bit more time.
            1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

            2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

            Comment

              #7
              Do a plug chop when it is stumbling and see what you get, your lean I bet down low.

              V
              Gustov
              80 GS 1100 LT, 83 1100 G "Scruffy"
              81 GS 1000 G
              79 GS 850 G
              81 GS 850 L
              83 GS 550 ES, 85 GS 550 ES
              80 GS 550 L
              86 450 Rebel, 70CL 70, Yamaha TTR125
              2002 Honda 919
              2004 Ural Gear up

              Comment

                #8
                Have the carbs been synched yet ? If not do that first. Then Id try a 1/2 turn in on the mixture screws & see what it does and if its the same go a half out & see what it does. There are far smarter guys then me on here but that's what Id do. One of them will jump in soon with probably better advise. I don't think youre running on the main jets at that RPM

                Comment

                  #9
                  thanks i'll give that a try

                  Comment

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