CB1100 Forum
Cold start idle rpm - Printable Version

+- CB1100 Forum (http://cb1100forum.com/forum)
+-- Forum: Honda CB1100 Discussions (/forumdisplay.php?fid=1)
+--- Forum: Mechanical & Technical (/forumdisplay.php?fid=3)
+--- Thread: Cold start idle rpm (/showthread.php?tid=11971)

Pages: 1 2


Cold start idle rpm - pittycheria - 12-26-2017 07:32 AM

Does anyone else have a problem with a high idle RPM on a cold start / cold day (< 55 f) ? My 2017 ex starts with a high idle that normalizes once engine heats up. No biggie but was wondering if this is normal.


Sent from my iPhone using Tapatalk


RE: Cold start idle rpm - Lord Popgun - 12-26-2017 07:36 AM

What do you call high? What RPM?


RE: Cold start idle rpm - Houtman - 12-26-2017 08:04 AM

Is this not normal , like having the choke on with carb. bikes ?
cars do the same when cold , higher idle for short while and than back to normal .


RE: Cold start idle rpm - Rocky - 12-26-2017 08:05 AM

Anytime I start my CB between April and October it immediately has a higher idle for several minutes before it warms up and settles down.


Cold start idle rpm - pittycheria - 12-26-2017 08:06 AM

(12-26-2017 07:36 AM)popgun Wrote:  What do you call high? What RPM?


Between 1500 and 1800, stays high when changing gear and pressing clutch.


Sent from my iPhone using Tapatalk

(12-26-2017 08:04 AM)Houtman Wrote:  Is this not normal , like having the choke on with carb. bikes ?
cars do the same when cold , higher idle for short while and than back to normal .


It probably is the same thing and is normal.


Sent from my iPhone using Tapatalk


RE: Cold start idle rpm - The ferret - 12-26-2017 08:46 AM

Mine warms up at about 14000..drops to 12000..then to 1000

If I take off too soon after starting, it will hold the higher rpms for the first mile or so


RE: Cold start idle rpm - greekcb - 12-26-2017 08:48 AM

(12-26-2017 08:46 AM)The ferret Wrote:  Mine warms up at about 14000..drops to 12000..then to 1000

If I take off too soon after starting, it will hold the higher rpms for the first mile or so

My 14 does this exactly as well


RE: Cold start idle rpm - Lord Popgun - 12-26-2017 08:54 AM

Yeah, thats normal. As the engine warms up the ECU commands the IACV to change the idle air and the idle speed goes down.

FYI, There is no value for cold idle in the service manual that I can find. Only to warm the engine then check for 1100+- 100rpm with a tach that can read at least 50rpm changes.


Cold start idle rpm - pittycheria - 12-26-2017 08:57 AM

Thank you all


Sent from my iPhone using Tapatalk


RE: Cold start idle rpm - Lord Popgun - 12-26-2017 09:20 AM

Ferret, 14000! Then 12000! Man, you sure got a different engine that I did!!! Smile