need some help with motor trouble

Discussion in 'General Harley Davidson Topic' started by madcatter, Jun 12, 2014.

  1. madcatter

    madcatter New Member

    not sure where i should post this,first poost here.
    heres the problem.i have a 09 ultra that has a knock from 2100-2700 rpm in every some stuff i looked at or did,cleaned air filter,changed plugs twice,opened primary thinking it coulda been something in there,checked the coil wires thinking it was a spark issue,been doing this for a few tanks of gas so its not bad fuel...theres no engine light exhust leaks,belt is tensioned correctly....i got a stethoscope and went over lifter blocks,cam area,cylinder walls,heads,all sounded good,now i found the problem to be in the rear cylinder rocker i never messed with these new motors,but was always into a shovelhead or panhead so i am not sure what i need to get ready for.i guess its first to take rocker cover off.
    could i have a push rod outta adjustment and the lifter isnt building oil until after the rpm gain?the lifters have no noise at start up which tells me its good.
    any help on where to look next?
  2. Dr. Dolittle

    Dr. Dolittle Experienced Member Contributor Retired Moderators

    Some other really smart members will help you out a lot more than I can, but I'll ask some questions to get things started.

    1. You say 2100-2700 in all gears. What about the same RPM range in neutral with the bike not moving?

    2. What's the most recent modification or maintenance that you did to the bike before you noticed the knocking?

    3. Did you recently switch lubricants?
  3. stray dog

    stray dog Junior Member

    What mods are done to the bike? Stage 1 ?

    What octane fuel are you using?
  4. Breeze3at

    Breeze3at Well-Known Member

    Is the 2100-2700 knock at steady throttle settings, under acceleration or both?
    You say you have isolated it to the rear rocker box. The push rods are non adjustable, and a bent or loose one would cause problems/noise at more rpms.
    Inside the rocker box is a lot like a pan or shovel, not hard to remove to take a look.
  5. Jack Klarich

    Jack Klarich Guest

    A bad lifter could cause noise in the upper rocker box, the stock lifters and push rods are not adjustable
  6. r_k_dragon

    r_k_dragon Active Member

    Well, welcome to the forum from the southwest desert. I'd start with the fuel!
  7. Bodeen

    Bodeen Well-Known Member Staff Member Moderator Contributor

    Is there some sort of tuner or fueler on the bike?
  8. madcatter

    madcatter New Member

    the knock is not when its idleing-only under load of acceleration-but i located it with the stethescope while in idle so i guess it is,but not as noticable
    it has a race tuner(screaming eagle)
    stage one set up...
    i have always ran either amsoil or mobil 1 v-twin synthetic oils and i never have missed any routine changes(3000 mile usually give or take a couple miles,and every third oil change i change tranny-shockproof stuff-and primary-formula1 stuff)
    always run 93 octane fuel.been thru many tankful of fuel and its not improved.

    i cant understand that its tune has changed,but possible.
  9. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

    That rpm range is right at the beginning of the torque band depending on cams. Going back to your stethoscope, check the bottom and sides of the engine case towards the back and then the front. Both sides, front, back and bottom (front and back). What you are listening for is a clicking (or worse clunking) sound that may indicate a problem with the connecting rods. This is not common, but members have discussed it here before. It is a bear to find!!


  10. sportster 2001

    sportster 2001 Banned

    you can get an auto (or bike) ase mech book on amazon for < $20

    octane ping

    timing not tdc (same reason as octane, pre-detonation). timing chain ? (i think rockers roll on crankshaft for harley, unsure of new). rods may be hydraulic adjusted if not adjustable. blockage in hydraulics wrong oil ?

    carbonized piston or upper head (dome) above piston. this reduces dedonation area and will cause poor burn, mileage, ping. pull plugs look for gunk.

    be real CAREFUL diag with screwdriver to ear or stethascope it can fool you. it's all metal so sound will travel through whole bike and not always "straight" as you think - there are cavities and oil and such. (i had one mech diag a lower crank issue and found later the thud was on the front end steering pump !)

    other guy had good idea

    what rate (exactly) is the beat or ping: does it pick up as speed picks up ? does it hit once ever other power stroke ? every stroke ? 2x every stroke ? this could narrow down things quite a bit.
    Last edited by a moderator: Jul 18, 2014