High RPMs cold start
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Club Member
Joined: Dec 2014
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From: SWFL
High RPMs cold start
For some reason when I start up for the first time in the day it winds up to about 2700 rpms for a second or two before slowing down to 1400and beginning its usual warm up. Does anyone else experience this? To me, 2700 rpms is way too fast for a just started motor.
Its a 19 fat boy s with a sepst stage 2 flash.
Its a 19 fat boy s with a sepst stage 2 flash.
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Club Member
Joined: Dec 2014
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From: SWFL
The bike only has 1500 or so miles on it, so nothing should need cleaning anyway. This is a ECM thing I think. Was really looking to see if anyone else was seeing the same thing.
Cruiser
Joined: Aug 2018
Posts: 109
Likes: 12
From: south Texas
Is it just the canned SEPST stage II flash or were recording runs made to finalize the tune? I ask because the service rep that tuned my bike after repairs determined that my SEPST stage I canned tune was corrupt and had to begin from scratch. I trust him too . He's been a bike tuner for some 25 years.
Last edited by RobertJO; Oct 22, 2018 at 01:09 PM.
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Tourer
Joined: Jul 2017
Posts: 310
Likes: 58
From: UAE
If the tuning has been changed, check the IAC warm up steps. These are most probably too high. Try by lowering the value at the temperature that you are having this increase in idle rpm.
You can also just replace these values of the latest saves IAC warm up steps table with the original values of the IAC warm steps table and see what it gives you.
You can also just replace these values of the latest saves IAC warm up steps table with the original values of the IAC warm steps table and see what it gives you.
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Pretty normal on a cold start for the M8. Mine did it stock, and still does it with stage 2 tune. Haven’t noticed it being 2700 exactly but certainly higher rpm on firing before settling to 1400...then 940 when warm. It was 840 warm when stock, 940 since stage 2 tune.