RPMs dropping at idle. Ideas on a cause?
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Road Master
Joined: Dec 2010
Posts: 1,248
Likes: 1
From: Jacksonville, NC
RPMs dropping at idle. Ideas on a cause?
Has anybody had their revs drop strangely? On my way home today and a couple of days ago. I had it happen several times within a few miles where the revs in first gear while waiting for traffic dropped down pretty far below the normal of 960-1060 or so all the way down below 800. About a mile or so from my house the revs were back to normal when stopped in first gear. Oil temp was only about 218. First time I've had it happen so I'm not going to panic yet but I've done enough maintenance and parts installs of my own to make warranty claims a pain so I'm hoping it's just an oddity. I tried searching and it only seemed to turn up threads about carbed bikes. My bike is a 2012 Fatboy Lo with 103 stock with stage 1 including Vance and Hines BSS with BCT QQ baffles, AC, and Powervision. I've just done basic tuning runs, no idle adjustment with the power vision. The bike seems to run strong otherwise and like I said it's only happened a couple of times. I'm hoping maybe something simple like poor gas but since it's only happened twice I'm thinking that's probably not it since I'd expect it to happen more often. Any help would be appreciated.
Club Member
Joined: May 2007
Posts: 145,895
Likes: 821
From: 40 miles Northeast of Indy..
When I first got our 07 she did the same several (5-6 times) before the 1k service, She even died a couple times at a stop light.
Then I added the SE-AC, pipes, SERT tuner and Dynoed..
Don't think, at least can't remember her doing it even once in the last 40K.
I'd lean to some tuning issue.. which bad gas can even cause that.
.
Then I added the SE-AC, pipes, SERT tuner and Dynoed..
Don't think, at least can't remember her doing it even once in the last 40K.
I'd lean to some tuning issue.. which bad gas can even cause that.
.
Last edited by oct1949; Jun 29, 2013 at 02:34 PM.
Cruiser
Joined: Apr 2008
Posts: 152
Likes: 1
From: Colorado
Same here
Mine does the same thing from time to time and I have to throttle it up to keep it running. Been that way for a few years but it is very occasionally. Lately it has been running up the RPMs a couple of time too. IDK what it is, I hear it can be a RPM sensor somewhere, but again it is sporadic.
2007 Night Train, 40+k, Stage 1, V&H pipes and fuel pak.
2007 Night Train, 40+k, Stage 1, V&H pipes and fuel pak.
Check out the IAC IT IS A PLUNGER IN THE INTAKE MANIFOLD..Cleaning it from time to time stopped my bike from doing all of those symptoms..
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