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Rough idle with choke on

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  • Rough idle with choke on

    hello all, looking for some help. 2003 roadstar 1600

    I couple months ago i rebuilt and cleaned my carb. It has stock jets in it and stock airbox and plain vance and hines Longshot. I am now having an issue with rough idle with the choke on when starting it up in the morning and I am having to keep the choke on for a good 4-5 minutes before being able to turn the choke off and ride. Once warmed up the bike runs like a dream. I checked for any vacuum leaks and couldn't find anything. The manifold is new. And the air filter is clean. I have tried adjusting the PMS screw from 2 1/2 turns out to 3 out and 3 1/2 out to see if it helps and it doesn't. I pulled the float bowl off last night and replaced the needle valve incase that was leaking. Anyone got any other ideas? I use to only have to keep the choke on for less than 1 minute and she'd be good to go.

  • #2
    When it starts to run a little rough push it in a bit until it smooths out. It sounds like it is running exactly like every other roadstar built. including how long you have to leave the choke on.

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    • #3
      Ok cool, ill give that a try. Was worried because the amount of time needed for the choke has been prolonged. But if its normal.. then oh well!

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      • #4
        My bike spits and coughs when cold if I push the choke in before it's ready, which depends on the ambient temperature. Doesn't sound like you have anything to worry about.

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        • #5
          The choke or more accurately enricher is not to be used just full on or full off. It needs to be used throughout its full range to not only start the bike, but to smooth out the idle as the engine warms up.

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          • #6
            Well said Shores it simply isnt an on / off switch. I use it too in all its range. Slowly over time from full to off and all outside temp dependent. Colder temps longer enricher used. JC

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            • #7
              My choke likes to stick in the on position - and I gotta pull fairly hard on it.

              That said, since the bike's a paint-shaker, the choke always manages to free itself at just about the right time.. can't ask for more than that!

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              • #8
                Originally posted by SuperG View Post
                My choke likes to stick in the on position - and I gotta pull fairly hard on it.

                That said, since the bike's a paint-shaker, the choke always manages to free itself at just about the right time.. can't ask for more than that!
                It’s adjustable using the plastic nut on the back side.

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                • #9
                  Originally posted by Shores View Post

                  It’s adjustable using the plastic nut on the back side.
                  Good to know. Thks!

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                  • #10
                    It's not the nut that puts tension on the shaft, that just keeps it in place tightly on the mount. There is however a round disc nut that adjusts the tension.

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                    • #11
                      Originally posted by roadiemort View Post
                      It's not the nut that puts tension on the shaft, that just keeps it in place tightly on the mount. There is however a round disc nut that adjusts the tension.
                      As always, just scrolling thru and I’ve found another minor adjustment I’m gonna make to my bike. So much great information on this site. Thanks.

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                      • roadiemort
                        roadiemort commented
                        Editing a comment
                        Your welcome.

                    • #12
                      Originally posted by Father Pobasturd View Post
                      My bike spits and coughs when cold if I push the choke in before it's ready, which depends on the ambient temperature. Doesn't sound like you have anything to worry about.
                      This is EXACTLY how I broke my left shoulder @ two years ago. I was visiting a close friend whose house was on a hillside. He has a circular drive, and I had parked my R* on it while we went to dinner. Upon returning, I set the enrichener and started the bike, while duck-walking backwards to attempt a 90 degree turn to downhill. It was a new moon night so visibility was zero. Achieving the position desired for departure, I turned the enrichener off and put the bike in gear, Letting off the clutch, the engine immediately died. The bike then fell to the downhill side. Instinctively, I put out my left arm to arrest my fall. It felt like something indescribable! In pain, I retreated to my friend's house, where, after a handflull of generic ALEVE, I felt well enough to remount my bike and head home ( a 75 mile trip). After a long series of 'medical treatment (x-rays and p/t, they had me undergo a MRI, where they found that I had : dislocated my left shoulder, and torn three of the four tendons of my rotator cuff. It took almost a year to the date of my injury to get the surgery I needed to repair the damage. Now, instead of a ball-and - socket, like most people, my left shoulder joint consists of a ball where the socket used to be, and a plate where the ball used to be. I estimate that I am at @ 80 % of what I used to be able to do with my left arm. Moral?: if you are falling with the bike, let go of the bike, and try to fal away from it, and 2.) don't turn off your enrichener too early, regardless of the ambient temperature (it was early June in Texas, if that's a guide!)

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                      • #13
                        The enrichment knob is not an on-off switch.

                        As the bike warms up one should push it back in, in increments.

                        There’s two or three phases owners need to go through until the engine will respond to throttle without sputtering as it’s reaching operating temp.

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