03-21-2018, 12:41 AM
(03-21-2018, 12:16 AM)Dave_imp Wrote: Update. I performed a test suggested by Max, and here are the results: I unplugged the connection to the IACV and rode the bike yesterday. The temperature was 58 degrees, and the bike had not been started in 24 hours. The engine started normally, and idled at about 700 RPM initially. I’m not sure if it would have stalled if I allowed it to idle by itself, but I warmed it up for about two minutes by gently blipping the throttle before going for a test ride. I rode about three miles of stop and go on city streets and as the engine temperature rose, so did the idle RPM. It reached a steady, smooth idle of about 950 RPM before I turned it off, and there was no indication that it would stall. I let the bike sit for about one hour before restarting, and then took it for a longer ride that included stop and go, and about three miles on the freeway. The engine was fully warmed up on this ride, and it settled into a nice, smooth 1,000 RPM idle. There was no indication of stalling, and it never dipped below 1,000 RPM when allowed to idle. I do believe I felt a slight loss in power (very slight), but other than that, the bike ran perfectly. The idle was smooth and repeatable at every stop, it never dipped below 1,000 RPM, and the engine never missed a beat. This test was performed under cool conditions, so I don’t know if it would be repeatable under more severe (hotter, more stop and go) conditions.
On another note, my bike has never experienced the increased RPM when in 1st gear, as the clutch is being let out, as described by other members. Probably 90% of the time I wait until I feel the clutch begin to engage before applying any throttle, so I believe I would have noticed this condition if it was present. This new idle condition described by some members is interesting, and I we can find out if our bikes are designed to do this.
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.