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CB1100 Idle speed instability problem
I don't know if you would have noticed it Dave, because who puts their bike in gear during cold start high idle and lets out the clutch without their right hand being on the throttle? That is not a natural thing to do. It never would have occurred to me to even try this had it not been discussed in this thread. I might do it one more time as an experiment once the weather warms up, just to see if it's a cold weather thing, but I rode my bike 91 miles the other day and it was perfectly normal as far as I am concerned..but.. I let the bike do it's normal cold start idle thing, when it dropped down to 1050 I dropped it in gear and let out the clutch feeding in throttle to move out.
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Actually, I am convinced I would have noticed this. I have never waited long enough for my cold/high RPM idle to drop before riding off (how long does this actually take?), and I usually do not just drop it into 1st gear at a dead stop when it is idling high either. I wait about a minute to give the engine some time warm up, then I push the bike forward as it is idling so that it begins to coast down the slight hill in my driveway. After I pick up momentum I pull in the clutch and drop it into 1st gear, and I do not apply any throttle before I feel the clutch begin to engage (there's no need to apply throttle when the engine is idling high anyway). My engine RPM has never increased when I have done this. I am wondering if this is normal for our bikes, or does this just indicate that something else is wrong with my bike?
Congratulations Dave!
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Please, it's too soon for congratulations! I have thought that I cured the idle problem three times now, and each time it was not to be. The first time was when I replaced the EOT sensor. The second time was when I tightened the clamps on the throttle body. And the third time was when I drained and refilled the gas tank with a different brand of gas.

I would have more trust in the results of this latest test if I could repeat it in much warmer conditions (80 - 90 degrees, versus 58 degrees), and if I put a lot more miles on it during the test, particularly stop and go miles.

I will take pictures of the old and new ACV, and post all of my comments.
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Messages In This Thread
RE: CB1100 Idle speed instability problem - by Dave_imp - 03-21-2018, 10:26 AM

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