12-04-2017, 03:47 PM
(12-04-2017, 01:26 PM)736cc_imp Wrote: My 2013 idle when ice cold is 1400 or so BUT rises to 2000 immediately when it’s dropped into 1st gear. Put it back into neutral, it immediately goes down to 1400. After a brief warmup ride of a couple of blocks it idles at 1050 in neutral or in 1st w/ clutch pulled. Why/how does the bike idle speed rise as soon as it’s put into gear BUT only when ice cold? Some stick shift cars (and bikes, too: ie 2018 Suzuki SV650 has this subtle in gear rpm lift-aid to avoid stalling in 1st gear) computers deliberately lift the rpms when put into gear. I never heard this mentioned w/ our CB1100, but mine apparently senses being put into gear and lifts the rpms alot; BUT it’s only when cold. Warmed-up I don’t see any rpms difference from neutral and in gear. Bike runs mint btw after a very brief warm up, and has done so for 24,000 miles.
Comments? Is this perhaps related to the demonic idle possession that afflicts random CB1100’s?? My bike’s computer KNOWS it’s in gear and lifts the idle speed BUT ONLY WHEN ICE-COLD. There must be a gear sensor connected to engine temperature sensor to do be able to accomplish thins.
How cold is ICE-COLD? After reading your post I went out and tried this on my CB. It was about 55F, which is cold enough to trigger the normal fast idle. I shifted back and forth from 1st and 2nd gear back to neutral and the idle stayed at 1400. If the temp needs to be around freezing to observe this effect, I may have to wait a month or two.