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CB1100 Idle speed instability problem
(05-17-2018, 11:47 PM)Dave_imp Wrote: Update, and something interesting: I've had the bike out the past two evenings (25 miles Wednesday, a lot of stop and go) and about 10 miles last night. So far it is running perfectly!

To my surprise, for the very first time, (at least that I have ever noticed) I discovered that my idle speed increased a very small amount when I was releasing the clutch when the engine was just started and still in the cold/high idle mode. I had to actually stop the bike twice to determine if what I was seeing was real, or imagined. Just at the point where the clutch would begin to engage the RPM increased by less than 200 RPM. I have never noticed this before, but the increase was so slight that it's possible that I just missed it. This is a topic that was brought up (I believe in this thread) a while back, but not much was ever said about it (Ferret commented about it). Ever since the topic first came up I was checking my bike to see if it was happening, and it was not. But like I said, it was such a small change in RPM, and it happened so quickly and almost completely unnoticed, it may have been happening to my bike and I never noticed. Has anybody else noticed that their bike does this also? I wonder if replacing the IACV had anything to do with this?


I know I brought it up a while ago and posted a link to a YouTube video of the cold idle increase. I also have video of the idle rpm decrease during the warm weather riding. I haven’t had the IACV replaced.

Something I have noticed but not quite sure yet if it is just a gap in issues or coincidence. I know I don’t need to run 91 octane fuel but is just a habit from previous bikes and cars, I recently filled up with 87 octane twice and haven’t had any issues...yet. I’ll fill up a third time then switch fuel again to see if I have any changes. I don’t have the time or patience to dig as deep as some of the other guys so I will try to keep tabs on the off the wall things I notice with my bike and share for information, questions or even entertainment.
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RE: CB1100 Idle speed instability problem - by Mechanix_imp - 05-19-2018, 01:48 PM

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