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Cold start idle rpm
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pittycheria Offline
1st Service Completed

us
Posts: 55
Joined: May 2017
Post: #1
Cold start idle rpm
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.


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12-26-2017 07:32 AM
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popgun Offline
Lives On Two Wheels

Virginia Beach
Posts: 6,201
Joined: Apr 2013
Post: #2
RE: Cold start idle rpm
What do you call high? What RPM?

If you come to a fork in the road, take it!
2013 CB1100
2012 ST1300
12-26-2017 07:36 AM
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Houtman Offline
High Mileage

NC USA
Posts: 1,059
Joined: May 2013
Post: #3
RE: Cold start idle rpm
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 .
12-26-2017 08:04 AM
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Rocky Offline
Road Warrior

Nova Scotia, Canada
Posts: 2,144
Joined: Apr 2014
Post: #4
RE: Cold start idle rpm
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.

Still rockin', rollin', and ridin' after all these years
'67 BSA 441 VR, '70 Triumph Tiger 100, '02 Honda CB900F, '06 Triumph T100 Bonneville, '14 Honda CB1100A
12-26-2017 08:05 AM
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pittycheria Offline
1st Service Completed

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Posts: 55
Joined: May 2017
Post: #5
Cold start idle rpm
(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.


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(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.


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(This post was last modified: 12-26-2017 08:07 AM by pittycheria.)
12-26-2017 08:06 AM
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The ferret Offline
Forum Moderator

Ohio
Posts: 19,810
Joined: Apr 2013
Post: #6
RE: Cold start idle rpm
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

.
2014 DLX and 2006 ST 1300

It doesn't matter what I ride, where I ride, or how far I ride... it only matters THAT I ride...every day...Ferret
12-26-2017 08:46 AM
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greekcb Offline
1st Service Completed

SOUTHSIDE! Chicago burbs
Posts: 84
Joined: Sep 2017
Post: #7
RE: Cold start idle rpm
(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
12-26-2017 08:48 AM
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popgun Offline
Lives On Two Wheels

Virginia Beach
Posts: 6,201
Joined: Apr 2013
Post: #8
RE: Cold start idle rpm
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.

If you come to a fork in the road, take it!
2013 CB1100
2012 ST1300
12-26-2017 08:54 AM
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pittycheria Offline
1st Service Completed

us
Posts: 55
Joined: May 2017
Post: #9
Cold start idle rpm
Thank you all


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12-26-2017 08:57 AM
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popgun Offline
Lives On Two Wheels

Virginia Beach
Posts: 6,201
Joined: Apr 2013
Post: #10
RE: Cold start idle rpm
Ferret, 14000! Then 12000! Man, you sure got a different engine that I did!!! Smile

If you come to a fork in the road, take it!
2013 CB1100
2012 ST1300
12-26-2017 09:20 AM
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