Idle Adjustment
Road Master
Joined: Aug 2007
Posts: 1,183
Likes: 1
From: Graham, NC
RE: Idle Adjustment
ORIGINAL: OldFenderGuy
Not usless the EFI setup on the Sportster is completely different than that on the Big Twins....
Changing the idle speed on the BT EFI systems requires that you modify/remap the ECU program, which can be done using a scanalyzer tool, SERT, 'reflash', etc....
On the carb'd bike it's a simple matter of turning an adjustment screw.
ORIGINAL: mrb302
I don't know for 100%, but the FI bikes *should* have a very similar set-up to adjust idle speed. The FI version *should* simply open/close the butterfly in the throttle body to change the speed. The fuel mix *should* be automatically compensated for by the FI system.
I don't know for 100%, but the FI bikes *should* have a very similar set-up to adjust idle speed. The FI version *should* simply open/close the butterfly in the throttle body to change the speed. The fuel mix *should* be automatically compensated for by the FI system.
Changing the idle speed on the BT EFI systems requires that you modify/remap the ECU program, which can be done using a scanalyzer tool, SERT, 'reflash', etc....
On the carb'd bike it's a simple matter of turning an adjustment screw.
How does the system meter the incoming air charge? There has to be a butterfly or something mechanical that the throttle controls, right?
Ultimate HDF Member
Joined: Sep 2005
Posts: 8,641
Likes: 26
From: Ozark Country
RE: Idle Adjustment
ORIGINAL: mrb302
Really!?!?
How does the system meter the incoming air charge? There has to be a butterfly or something mechanical that the throttle controls, right?
Really!?!?
How does the system meter the incoming air charge? There has to be a butterfly or something mechanical that the throttle controls, right?
"Something" must tell it how to work....
No choke **** that I've seen, so the choke function (much like the idle speed and A/F mixture) must be part of the ECU mapping.
Road Warrior
Joined: Jul 2006
Posts: 1,351
Likes: 4
From:
RE: Idle Adjustment
Look at the second post. Then read the whole thread. The original topic was not lost at all.. actually we are helping two people at once. 
That's how we roll.. Besides, it's my self-appointed duty to monitor topic flow...stop steppin on my toes man! [sm=alcoholic.gif]
That's how we roll.. Besides, it's my self-appointed duty to monitor topic flow...stop steppin on my toes man! [sm=alcoholic.gif]
Road Master
Joined: Aug 2007
Posts: 1,183
Likes: 1
From: Graham, NC
RE: Idle Adjustment
ORIGINAL: OldFenderGuy
How does the 'enrichener system/choke' work on a EFI engine?
"Something" must tell it how to work....
No choke **** that I've seen, so the choke function (much like the idle speed and A/F mixture) must be part of the ECU mapping.
ORIGINAL: mrb302
Really!?!?
How does the system meter the incoming air charge? There has to be a butterfly or something mechanical that the throttle controls, right?
Really!?!?
How does the system meter the incoming air charge? There has to be a butterfly or something mechanical that the throttle controls, right?
"Something" must tell it how to work....
No choke **** that I've seen, so the choke function (much like the idle speed and A/F mixture) must be part of the ECU mapping.
Tourer
Joined: Nov 2007
Posts: 349
Likes: 1
From: Orange Co. So Cal
RE: Idle Adjustment
Jeez, I love this forum! Theeffort expended by those who respondedwas truly astounding! Thanks to everyone!!! BTW, I wished I had asked how to open the reserve on the 3.3 tank before I needed it. I foolishly assumed it would be like, well, any other bike I'd ridden, but they were all UJMs. Who'd'a thunk on a Harley you have to turn the lever, not 90 degrees forward, but 180 degreesto the inverse vertical. The rush-hourSo. Cal. freeway is nerve-racking enough without running out of gas in the car pool lane and having to slooooowlly work your way to the right shoulder as the bike comes to a complete stop in the #3 lane on a four-lane stretch. Good thing I just tried turning the lever every which way and found the secret!! Thanks again to all!!!
Road Captain
Joined: Jun 2007
Posts: 552
Likes: 0
From: South Orange County, California
RE: Idle Adjustment
ORIGINAL: mrb302
I know that it is a crappy cell phone pic, but... here goes.
In the pic you will see the black top cover of the carb on the left. The gold colored screw in the center of the pic is the idle adjustment screw. It is located on the linkage that connects the throttle and idle cables from the throttle to the carb. This will adjust your idle SPEED, not mixture. On my bike, it can be seen with the air cleaner on, but with a factory or other large AC you may have to remove the cover to see it.
I don't know for 100%, but the FI bikes *should* have a very similar set-up to adjust idle speed. The FI version *should* simply open/close the butterfly in the throttle body to change the speed. The fuel mix *should* be automatically compensated for by the FI system.
[IMG]local://upfiles/39638/7D7EACCFAD6D4E7DA13F45EBF0C76F8B.jpg[/IMG]
I know that it is a crappy cell phone pic, but... here goes.
In the pic you will see the black top cover of the carb on the left. The gold colored screw in the center of the pic is the idle adjustment screw. It is located on the linkage that connects the throttle and idle cables from the throttle to the carb. This will adjust your idle SPEED, not mixture. On my bike, it can be seen with the air cleaner on, but with a factory or other large AC you may have to remove the cover to see it.
I don't know for 100%, but the FI bikes *should* have a very similar set-up to adjust idle speed. The FI version *should* simply open/close the butterfly in the throttle body to change the speed. The fuel mix *should* be automatically compensated for by the FI system.
[IMG]local://upfiles/39638/7D7EACCFAD6D4E7DA13F45EBF0C76F8B.jpg[/IMG]
Road Warrior
Joined: Jul 2006
Posts: 1,768
Likes: 4
From: eastern Pa
RE: Idle Adjustment
Man, did this thread get highjacked
then again alot of GOOD info there[sm=chattypair.gif]
then again alot of GOOD info there[sm=chattypair.gif]
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Road Master
Joined: Aug 2007
Posts: 1,183
Likes: 1
From: Graham, NC
RE: Idle Adjustment
ORIGINAL: RATROD HOG
Man, did this thread get highjacked
then again alot of GOOD info there[sm=chattypair.gif]
Man, did this thread get highjacked
then again alot of GOOD info there[sm=chattypair.gif]
[IMG]local://upfiles/39638/1BFCADD23CE54E879940118BDC983267.gif[/IMG]
Stage II
Joined: Feb 2008
Posts: 2
Likes: 0
RE: Idle Adjustment
This Forum is rediculous.
I had one little problem with my idle this morning, came here to look for a little help and walk away a very educated man.
thanks to all who replied and advised. Good work.
-j-
I had one little problem with my idle this morning, came here to look for a little help and walk away a very educated man.
thanks to all who replied and advised. Good work.
-j-