Help! Poor running and I want to go to Sturgis

Steel said:

If a coil quits firing that would cause some unburnt fuel to pass.

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1K9 said:

Beast. Sorry to hear about your idle and running issues in the middle of the Black Hill's rally. My R3 suffered similar problem for several years. Problem started when the tank was lifted to install a keyless module from DeCosse. I reverted back to using the key. Then I installed to RamAir and the "throttle-up" fits started. At first a TPS change and a HansO tune seemed to help. Problem came back. Changed the MAP sensor. Seemed to help, problem came back. Somehow the bike although it tried, it did not kill me. Last November while in Leakey Robert (claviger) disconnected the stepper and removed the idle primary butterflies. Then adjusted the master idle screw so the bile would idle controlled by a hard stop instead of the stepper motor. BearClaw and RamAir had to come off to do that. Eventually I removed the linkage arm from the stepper to the throttle and reconnected the stepper. The motor moves but does not actuate the throttle. The bike throws a red engine light but it goes away. Otherwise it runs like a charm since.

I would disconnect the stepper motor and see if the bike idles and the throttle stops going wild. If it don't idle, adjust the main mechanical idle stop until the bike idles at 850 to 900 rpm. If that does not fix it, I have no idea what else to do. My issue was with the idle arm. It was gummed up and would not move freely causing stepper miss-reading and idle run-up. I just took it off. Probably the stepper motor should be replaced too but, I'm not going back to stock. The bike runs better without it. The bike does not need the stepper motor to run. After Robert's fix my bike would require throttle to start but it has adapted... not it starts into a slow idle just with clutch and start button. While cold I keep it alive with the throttle lock. Once hot it idles true and steady. It lurches from idle to shallow throttle but they all do that. I go into turns with the rear brake on to smooth that transition from throttle off to throttle light.

I hope this helps and your vacation goes will in spite of the idle problems.

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1K9 said:

This is the front aspect of the throttle body. The throttle cables have been removed. On the right lower field you have the stepper motor. It's purpose is to push and trim the idle arm linkage. The arm rotates on a spindle and is held by a washer and a cotter pin. Just one mini drop of very thin oil right by the washer should suffice. Make sure the linkage arm is moving freely. Make sure everything else is moving freely and that there is adequate play in the throttle cables. You don't have to remove them to try this fix. The stepper connector is right in the front aspect of the throttle bodies. Figure it out and disconnect it. The hard idle screw is at 12 o'clock in the picture. In my case it is a 2mm allen with a lock nut. A royal pain to loosen from factory setting. Easier to do once the secondary TPS is removed. In the pic the head looks like a 6 or 7 mm wrench. If you don't have an android resetting the secondary TPS perfectly is going to be chance. Mark very well where it is before removing it. The PC version of TuneECU does not have a secondary TPS adjustment option. Android does.

From my limited experience this is either a bad TPS or a bad stepper of bad software. Good luck.

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Jag said:

I’m leaning towards a bad coil.

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TURBO200R4 said:

u may be correct it seems the longer and hotter they get the worse they work when they r bad
i do not remember will it straighten out after a while over 2500 rpm?

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TURBO200R4 said:

this is something i have tried
while idling good i disconnected the stepper motor (electric) and took it for a ride everything seemed ok but it turned on the check engine light. if i was on the road this is what i would try instead of messing with the throttle stop screw.
also try to inspect the three vacuum hoses going to map sensors.
if it just keeps getting richer (problem) then i would say try to check and make sure the o2sensor is working. if o2 is working it might be able to copensate for the running rich.

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