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How do I set the idle lower and what is TPS please help??

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  • How do I set the idle lower and what is TPS please help??

    Good evening fellow forum members,
    I have a 2006 road star midnight Silverado 1700. when warm the idle wanders and is a bit high. I read a few threads on here that talk about lowering the idle and some stuff about TPS. Can anyone PLEASE tell me exactly where and how to adjust the idle down, and possibly give insight on this TPS thing??????

  • #2
    TPS is your 'Trottle Position Sensor'. If it has never been fiddled with it should never Have to be fiddled with. You need a multi meter to re-set it if you ever mess with it.

    What sounds like a high idle to you is probably the normal 900rpm warn idle speed of a Roadstar.
    If you're trying to get a slow 'lope' like an older HD, that's actually too slow of an idle.

    Please give us more info about your bike.

    My Roadstar is an '06, by the way.

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    • #3
      Do you actually ride around dressed like that? Doesn't the motor cook your legs? Don't get me wrong, I'm not judging you, if that's your thing, that's great. All I know is wearing jeans and boots I can feel the heat coming off the motor. I would not even consider attempting riding like that.


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      • #4
        It is to be set when hot. Cold engine will idle lower and once up to temp will raise. If you raise at a cold temp it will rise and be high. Search youtube for engine idle sound if you dont have a tach and go from there.

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        • #5
          Well Charlie,
          If you have to ask about how to set the idle on your bike, then please, do not mess with the TPS.
          The idle adjustment is the knob that is just below the air filter box. Turning the knob counterclockwise, lowers the idle of the engine, turning it clockwise, raises the engine idle.
          The TPS is mounted on the carburetor and is coupled to the throttle shaft with very little adjustment. The adjustment is to fine tune the variable resister for the ignition timing.
          Like Spydr said, if it hasn't been fiddled with, then don't fiddle with it.

          Click image for larger version

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          • #6
            WARNING: Setting your idle too low will starve the top end of oil and damage your motor!

            Like it's been said, don't not to mess with the TPS, search YouTube for Roadstar Idle to find what 900 RPMs sounds like and set idle when the bike is HOT! Use the enricher knob to start the bike when cold and push it in as the bike warms up.

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