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Thread: Bumpy low speed driving

  1. #1
    Any ideas what can i do, when cruising low speed on first or second gear, the ride is everything else exept smooth.

    like, if you try to drive steady, second gear and ~2000rpm, the bike is constantly swooping, deaccelerating, and it sounds bit like its missing few sparks. So if you want to cruise ~walking speed, you cant drive whit torque, since you need to slip the clutch to keep ~2200rpm.

    On third, the bike cruises nicely all the way from 1500rpm, but on the first and second its realy bumpy...

    Ideas ?

  2. #2
    Senior Member
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    Do you have the airbox breather reroute mod? It helps with low-speed bumpiness.

  3. #3
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    Do you have the airbox breather reroute mod? It helps with low-speed bumpiness.
    at low speeds more oil seeps into the intake, without the breather reroute, vs higher speed when the oil is circulating better

  4. #4
    Kinda, just did it yesterday. (the simplest breather mod one)



    Just gotted my EMCSpy cable ready, any map-tuning that i could do to enhance the low rpm performance ?

  5. #5
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    It's really a shot in the dark if you don't have a wideband o2 sensor to know whether you're a little lean or a little rich - you can try decreasing a point or two from the fuel map between 900 and 1900 rpm at the two lowest throttle positions. If that makes it worse, definitely go back to the original map. Or of course you could try adding a point or two.

    Also - double check your static timing (just for good measure).

  6. #6
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    it is the nature of the beast.
    They are not smooth riding until 3rd gear or approx 30 mph

    HD pushrod motors do not like city or parade speeds.

  7. #7
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    start with the easier ones first like a TPS reset; idle adjustment; spark plugs

  8. #8
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    Nature of the beast is best answer.

    DO NOT TRY ANY ENGINE ADJUSTMENT FOR THIS.

    2200 is too low for a big twin, really. Don't listen to anybody else.

    First and second gear are like that, it's not a parade bike.

    (Mechanically: you said it works fine in other gears, that tells you everything is fine. It's the gearing and physics.)

    I just shut the bike off and straddle walk it if I'm stuck in a jam and I avoid parades.

  9. #9
    Senior Member konarider94's Avatar
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    x2 to what 07Bolt said. those things are key to low speed smoothness. as well as primary tension that others have mentioned.

  10. #10
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    Thanks for expanding with an explanation 07Bolt :)

    To be honest, since I did the breather reroute my bikes a LOT smoother in 1st/2nd.



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