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Adjusting idle speed on a 2005 Road Star Silverado

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  • Adjusting idle speed on a 2005 Road Star Silverado

    Hello and hope you all ate too much as well.

    It’s been a long time since I’ve been on a bike and I’ve been spending the last couple of weeks in parking lots practising the little things.


    The bike’s idling at 1400 and I know that’s quite high (900 RPM seems to be the target on a warm engine). I’m no mechanic and am strictly a recreational rider so I’d be grateful if you could give me specific, novice-proof details on A) how to find the idle adjust; B) Exactgly what to do once I’m there.

    Thanks very much. This is a great forum.

  • #2
    There is a black knob under the air filter in a mount on the engine. (you can't miss it) turn it clockwise to turn up idle and obviously counter clockwise to lower the idle. Make sure the engine is completely warmed up and the choke is off before making the adjustment.

    Comment


    • JourneyMan
      JourneyMan commented
      Editing a comment
      Thanks, davej; so we’re talking the right side of the bike?

  • #3
    yep right side just look under the air filter you can see it and get to it to adjust without removing anything.

    Comment


    • JourneyMan
      JourneyMan commented
      Editing a comment
      Perfect. Thanks again.

  • #4
    Davej, I have a couple of related questions if you don’t mind.
    I’m including a couple of photos of what must be thee idle-adjustment knob but, when I turned it counter-clockwise with my fingers, the entire exterior cable rotated but not anything internal , with the result that there was no adjustment possible via that method since it resulted only ii the cable beginning to wrap around itself as I turned.

    Is a screwdriver in the slot of the round dial required? I didn’t see how that would change things but I realize I could be wrong.

    Finally, when I start the bike and get it warm, it’s running at around 980 RPM but, after riding it round at slow speeds for a while, the idle rises to 1400 RPM at times, and a minimum of arouond 1100. Would you know what might be causing that RPM elevation?

    Thanks very much



    Comment


    • #5
      If you're saying turning the knob does not affect the idle, it could be corroded on the carburetor and frozen. If so, try turning it counterclockwise until it comes free. If that doesn't work, you may have to squirt some penetrating oil on the threads, on the carb.

      As for the difference in idle speed at different temperatures, I'm assuming you're using the enricher at start up, and then you're pushing it in when the motor is hot. If this is the case, get the idle adjuster turning first, then you can address the variable idle issue. The problem may resolve itself when you fix the idle adjuster.

      Comment


      • #6
        Thanks, Doc.

        Comment


        • #7
          Usually starts low then rises. It is critical that engine is at operating temp before any adjustment can be done. From what you are saying above it will need to be lowered.

          Comment


          • #8
            I’ll apply a little extra finger torque and see if the issue might be corrosion. When you say it starts low and then rises, are you saying it’s in the range of 850 or so at the beginning and up to 950 after some running around?

            Comment


            • #9
              Actually it can go higher. Personally I like to keep the idle around 1000 RPMs with the bike fully hot. 850 is minimum. If the RPMs are too low the top end of the motor can be starved of oil. But as the bike is warming up, with the enricher knob pulled out, it can climb up to 1200 RPMs until the motor is fully hot and you push it all the way in. If the idle is too high for your liking while warning up the motor you can push it in a little until you find the sweet spot. You may have to adjust it a couple times until the motor is fully hot.
              Last edited by Doc_V; 01-01-2019, 11:06 PM.

              Comment


              • #10
                Doc, I’m travelling at the moment but, when I get back to the bike, is there any risk of my damaging the idler-control knob when I do put some effort into that counterclockwise turn to try to loosen any possible corrosion? Is there a way to describe how much force I should put into that turning to avoid any damage?

                Comment


                • #11
                  If you are twisting the cable and no movement of the adjustment on the carb you are putting too much force. It should turn free with almost no resistance and adjust the idle speed, if it don't then you will need to work on freeing it up at the carb end.

                  Comment


                  • #12
                    Use your fingers only for the plastic knob, no tools. If that doesn't work, then do the penetrating oil on the carb, let it soak over night, and then you can use a tool to get a better grip on the carb side.
                    Last edited by Doc_V; 01-02-2019, 01:12 PM.

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