shimming carb question

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  • tlepac
    #1

    shimming carb question

    Is this something you do only with CV carbs or does it relate also to VM Carbs? I am having a hesitation between 4 and 5000 rpm on the bike and am wondering if this may relate to my problem. I am also changing out all of the vacuum tubing with new to see if this makes a difference. (As far as I can tell the vacuum tubing to my petcock and the breather hose is original with the bike so I am changing that out for new just on general principles) My problem does seem to be getting a bit better as I ride it more but the bike is still very cold blooded and I havent been able to get the idle down to 1100 to 1250 yet on my 79 GS 750L in addition to the above problems. It has new O rings, valve shims done and new petcock from Z1---Old one was shot.

    I have not done recent plug chops but the plugs when I pull them are tannish to slightly white.

    Thanks for any thoughts
    Tags: None
    • Guest
      #2
      VMs should have notches in the needle for adjustmenst so no need to shim.

        Comment

        • Detroit Diesel Man
          #3
          Originally posted by chef1366
          VMs should have notches in the needle for adjustmenst so no need to shim.
          True that VM's have notches for the needle but with mine I went one notch down to richen it and wasnt quite enough and a whole notch seemed a bit much...so I used feeler gauge material and made 4 "shims" and used those under the needle clip to get between the 2 notches..


          DDM

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            • Guest
              #4
              I use washers for 1/2 notches.

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                • tlepac
                  #5
                  Do you guys think this will help the cold bloodedness as well? I have to run the bike with the choke on at 3/4 to 1/2 for about five minutes before the throttle will work. Prior to that it bogs down and wants to die if I try to throttle at all. But once the throttle works then I am able to get going and within 10 minutes it acts more normal, although I dont seem to be getting the acceleration that I think I should be getting.

                  Thanks

                    Comment

                    • Steve
                      GS Whisperer
                      • Jun 2005
                      • 35924
                      • southwest oHIo
                      #6
                      Adjusting your needles will help with operation on the road.

                      To help with your "cold-bloodedness", turn the pilot fuel screw (the one on the bottom of the carb) out about 1/8 turn. You will have to also re-adjust the air screw on the side of the carb for proper mixture, but adding a bit of fuel to the pilot will help considerably.

                      .
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                        Comment

                        • tlepac
                          #7
                          Thanks Steve

                          I will try that and see what I get

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