05 Heritage idles too fast
Thread Starter
|
Stage III
Joined: Feb 2016
Posts: 3
Likes: 0
From: Indianapolis,IN
05 Heritage idles too fast
I'm having a problem with my 05 carburated heritage softail. At start up and for a short while after start up it idles down around 900-950 rpm. The longer i ride the faster it wants to idle, eventually idleing at about 1250-1300rpm. I've adjusted throttle cables but that had no effect. Any help would be appreciated. Thanks
Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
Likes: 189
From: 90210
I'd look at the carb tuning of the air/fuel mixture and idle.
When bike is hot, incorrect settings that work well cold/startup can cause either poor idling or higher idling after bike is hot. try getting the bike fully warmed up / hot and then adjust the air/fuel, the idle etc per typical CV tuning methods.
check out the first three websites on this google topic search- the info should get you going in the right direction on finding/fixing issue. https://www.google.com/search?q=cv+c...utf-8&oe=utf-8
When bike is hot, incorrect settings that work well cold/startup can cause either poor idling or higher idling after bike is hot. try getting the bike fully warmed up / hot and then adjust the air/fuel, the idle etc per typical CV tuning methods.
check out the first three websites on this google topic search- the info should get you going in the right direction on finding/fixing issue. https://www.google.com/search?q=cv+c...utf-8&oe=utf-8
Outstanding HDF Member
Joined: Jan 2014
Posts: 2,181
Likes: 488
From: Central California
It's most likely something as simple as a vacuum leak. Start with an inspection of all the small hoses particularly those between the throttle blade and the head. Eliminate the simplest causes first, or as I like to say, find out what is NOT the problem
Last edited by Mike Lawless; Feb 7, 2016 at 10:34 AM.
Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
Likes: 189
From: 90210
^^ good advice and reminded me of something- sometimes a tiny defect in an aged hose or intake gasket won't be evident when cold, but presents when bike is hot and hoses soften up / metal expands etc. I had that happen on my Evo - turned out to be the intake gaskets to head. No leak until bike was fully hot. Then idle was erratic, higher than normal.
Road Master
Joined: Jun 2011
Posts: 836
Likes: 230
From: Deep South
Vacuum Leak !!
good luck ...
Trending Topics
Seasoned HDF Member
Joined: Jun 2015
Posts: 10,287
Likes: 7,773
From: West Central FL
Adjusting the cables doesn't adjust the idle. What it does is adjust how much free play you have in the twist grip. Have you tried adjusting the idle screw? Not the idle/air mixture screw but the actual idle speed screw? If you mess with the idle/air screw before you get the carb adjusted right you'll mess up everything. But before you adjust anything make sure you don't have any intake leaks.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Ultimate HDF Member
Joined: Jan 2009
Posts: 5,016
Likes: 277
From: East Tn Foot of The Dragon
Vacuum leak would be my guess. With engine cold, lightly mist WD40 around carb and hose area and note if RPM changes.