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CB1100 Idle speed instability problem
Update: I am performing the four, wire connection inspection and cleaning steps recommended my Max, one at a time. I started with the IACV connection and here are my comments: Connection appeared clean and in perfect condition. I thoroughly sprayed the connectors with electrical connection cleaner and dried with compressed air. I then started the bike with the IACV disconnected to see what would happen. The bike had not been started in several days, but started quickly, and immediately went into an 1,100 RPM idle, which is surprising because it normally goes into a high (1,400 – 1,500 RPM) idle when the engine is cold. This idle speed lasted for maybe 5 seconds, or less, and then dropped to about 600 RPM. I believe it would have stalled, but I blipped the throttle a few times to see what would happen. Each time the idle speed returned to about 600 RPM, and I am sure the engine would have stalled had I not twisted the throttle. I reconnected the IACV and went for a ride. Within three miles the low idle condition returned, so the conclusion of this test is that cleaning the IACV connection does not cure the low RPM idle condition. I will continue testing today by disconnecting and cleaning the remaining three connections recommended by Max, and will report back (as soon as I complete rebuilding and installing the VFR800 forks).
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RE: CB1100 Idle speed instability problem - by Dave_imp - 03-10-2018, 01:26 AM

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