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Smoking carbs??

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    Smoking carbs??

    Well I finished rebuilding the VM29 smoothbores and installed them in the bike. I could not take it for a ride, as the front calipers are off the bike and being rebuilt. It runs a whole better than it did. It idles pretty smoothly at 1200 rpms. Boy is this motor noisy, is this normal. Revving it up, I didn't hit the flat spot in the middle like it did when I first brought the bike home. There is smoke coming up off the air cleaners! I did re-oil them after cleaning them, so maybe this is why??? What do the carb gurus think, normal or not. I guess I will have a better idea after riding the bike. But I am going to smell everytime I come back from a ride. Maybe this bike is going to me more of a project than what I anticipated.
    Last edited by Guest; 05-28-2009, 10:48 PM.

    #2
    I started the bike up after about a 1/2 hour of it being off. I don't see smoke anymore, and it seems like it is running good. So I will just have to wait and see how she runs out on the road. The cleaning did wonders. I benched synced the carbs, and turned the air screws out a full turn. It idles good.

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      #3
      Do you know what the sizes of the jets are you are using in the carbs?

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        #4
        Originally posted by Rock View Post
        Do you know what the sizes of the jets are you are using in the carbs?
        Main - 112.5
        Pilot - 25
        Needle clip - Second position from the top
        Last edited by Guest; 05-29-2009, 01:16 PM.

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          #5
          When I purchase the bike a fews back, it was running rich, plugs were sooty. And it really stumbled in the midrange. The carbs were filthy, so I started there. After reading some things in the garage section, I think I am going to check the voltage at the coils to see if there is proper voltage there. I guess the rich condiion could have also been caused by a weak spark.

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            #6
            one thing i did notice on my 1k when running stock coils and 29's was there would be a little bit of roughness on idle. After installing some accel coils it cleared everything up and started faster. I think the 29's deliver a little richer fuel charge in general and the hotter spark helps burn it up.
            78 GS1000 Yosh replica racer project
            82 Kat 1000
            10 990 ADV-R The big dirt bike​
            Some dirt bikes

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              #7
              Originally posted by first timer View Post
              one thing i did notice on my 1k when running stock coils and 29's was there would be a little bit of roughness on idle. After installing some accel coils it cleared everything up and started faster. I think the 29's deliver a little richer fuel charge in general and the hotter spark helps burn it up.

              Well I checked the voltage to the coil, measured 8VDC, and there was 12VDC at the battery. Guess I am going to have to do the coil relay mod. I also have a low output stator. It produces 60VAC at around 5k rpms. Should I get a new stator??? I do notice that the headlight is dim. Well there goes another $100.
              Last edited by Guest; 05-29-2009, 06:56 PM.

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                #8
                The joy of old bikes.

                At least yours looks good
                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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