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#2 carb not pulling a whole lot of vacuum

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    #1

    #2 carb not pulling a whole lot of vacuum

    I just got in from synching my carbs and 1, 3 and 4 are pulling a great vacuum at idle but #2 just cant get up there - it's like 8-10 inches under the other cylinders. No vacuum leaks and the bike idles great so I'm not really sure where to go next. Any ideas?
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    #2
    Sounds exactly like the vacuum line to the petcock isn't plugged.
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    Comment

      #3
      Originally posted by bwringer View Post
      Sounds exactly like the vacuum line to the petcock isn't plugged.
      It's plugged, I even bought new vacuum plugs today...

      Comment

        #4
        did you try turning the screw so the butterfly valve closes all the way?

        Comment

          #5
          Originally posted by catbed View Post
          did you try turning the screw so the butterfly valve closes all the way?
          Yep, bike dies.

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            #6
            vacuum go up at all? whens the last time you adjusted your valves?

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              #7
              Originally posted by catbed View Post
              vacuum go up at all? whens the last time you adjusted your valves?
              I personally have never done it, the PO said it was done about 5000 miles ago, and to be honest I'm not exactly sure how to or I would...

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                #8
                check out BikeCliff's Website. he has a tutorial for 16v and 8v engines. i dont know if the valves would affect it that much though. wait till others drop by.

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                  #9
                  Originally posted by catbed View Post
                  check out BikeCliff's Website. he has a tutorial for 16v and 8v engines. i dont know if the valves would affect it that much though. wait till others drop by.
                  How much of a PITA is a valve adjustment? 2-4 hour job or longer?

                  Comment

                    #10
                    i can do it in 30-45 minutes but ive done it before so id say first time would take 1-1/2 to 2 hours. pretty easy once you do it though.

                    Comment

                      #11
                      Is your bike an 8-valve or 16-valve? If it's an 8-valve engine, send me an e-mail, I will reply with my spreadsheet that helps you keep track of your adjustments and shim sizes.

                      .
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                      Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
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                      Comment

                        #12
                        Originally posted by Steve View Post
                        Is your bike an 8-valve or 16-valve? If it's an 8-valve engine, send me an e-mail, I will reply with my spreadsheet that helps you keep track of your adjustments and shim sizes.

                        .
                        It's a 16 valve, so no shims but twice the hassle haha.

                        Comment

                          #13
                          only thing i can think of that would lower vacuum would be intake valves messed, and that may be from a warped rocker arm maybe?

                          Comment

                            #14
                            Originally posted by catbed View Post
                            only thing i can think of that would lower vacuum would be intake valves messed, and that may be from a warped rocker arm maybe?
                            I ordered a valve cover gasket and new pilots (they are too small - I'm out like 3.5 turns) so I am going to adjust valves Wednesday and report back!

                            Thanks for the suggestions!

                            Comment

                              #15
                              Also check the vaccum dia on the slide assembly make sure it is correctly seated in the carb

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