EVO EFI Idle speed
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Stage IV
Joined: Apr 2021
Posts: 4
Likes: 1
From: Virginia
EVO EFI Idle speed
Hello. I’m brand new here and not sure how this works, but I have a question about efi idle speed. I recently bought a 97 road king with sequential port injection. I was wondering if there is a way to adjust the idle speed? Just a personal preference to the sound of the EVO. Any advice/suggestions are appreciated.
Road Master
Joined: Jan 2019
Posts: 1,123
Likes: 909
From: Texas
Hello. I’m brand new here and not sure how this works, but I have a question about efi idle speed. I recently bought a 97 road king with sequential port injection. I was wondering if there is a way to adjust the idle speed? Just a personal preference to the sound of the EVO. Any advice/suggestions are appreciated.
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,081
Likes: 2,159
From: Ohio
Low idle screw has to have the air filter backing plate removed to gain access to the screw, with the stock EFI shotgun plenum it will never lope. Evo's need intake cross talk to get the sound, I removed the center divider of the EFI shotgun plenum and got some sound out of it years ago but needed a chit load of fuel added after the mod.
If you want a Evo sound put a carb on it, if you want a 800 rpm Evo lope install a Total Performance oil pump designed to pump oil at idle, getting expensive already and haven't talked cam, lifters, adjustable push tubes to get more sound. The OEM 1000 rpm idle should be starting to sound good about now
If you want a Evo sound put a carb on it, if you want a 800 rpm Evo lope install a Total Performance oil pump designed to pump oil at idle, getting expensive already and haven't talked cam, lifters, adjustable push tubes to get more sound. The OEM 1000 rpm idle should be starting to sound good about now
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Stage IV
Joined: Apr 2021
Posts: 4
Likes: 1
From: Virginia
Seems like a little more than I am ready to take on at this time. I’m definitely more interested in miles than what it sounds like idling. I’ll keep all that in mind for sure though.
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Stellar HDF Member
Joined: Feb 2007
Posts: 2,558
Likes: 280
From: Russellville, Arkansas
There’s lots of information reguarding the old EFI here in this forum.
Since you just got the bike and before you adjusting idles....I would confirm all the sensors and Idle speed motor are working properly plus throttle cables are good. Otherwise, you’ll never get the idle speed set right.
I keep my cold idle speed around 1300 RPM
The hot idle speed is right at 1000 RPM
Unfortunately, you’ll be hard pressed to find anyone willing to work on that EFI system. More than likely, you’ll be doing it yourself.
Since you just got the bike and before you adjusting idles....I would confirm all the sensors and Idle speed motor are working properly plus throttle cables are good. Otherwise, you’ll never get the idle speed set right.
I keep my cold idle speed around 1300 RPM
The hot idle speed is right at 1000 RPM
Unfortunately, you’ll be hard pressed to find anyone willing to work on that EFI system. More than likely, you’ll be doing it yourself.
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HDF Community Team
Joined: Jan 2020
Posts: 1,434
Likes: 800
From: Colorado
Walk in the park.
Let the bike warm up so it drops to low idle and the motor oil is nice and hot, then break out a ball end 3/32 allen wrench to get to the low idle screw at an angle.
Your target RPM is 1000 RPM at low idle when the motor is hot , but really just want to look at the low oil pressure light, and want to adjust the allen screw in about 1/2 turn more, once the oil pressure light is not lightly blinking anymore with the hot motor oil. Hence may end up with the idle around 1100 rpm, if your oil pump is slightly worn/ not running thicker 20/50 convertial oil to keep the low pressure light from blinking at idle/oil pressure up at idle on the evo motor instead.
https://partsfinder.onlinemicrofiche...UEL%20INJECTED
Let the bike warm up so it drops to low idle and the motor oil is nice and hot, then break out a ball end 3/32 allen wrench to get to the low idle screw at an angle.
Your target RPM is 1000 RPM at low idle when the motor is hot , but really just want to look at the low oil pressure light, and want to adjust the allen screw in about 1/2 turn more, once the oil pressure light is not lightly blinking anymore with the hot motor oil. Hence may end up with the idle around 1100 rpm, if your oil pump is slightly worn/ not running thicker 20/50 convertial oil to keep the low pressure light from blinking at idle/oil pressure up at idle on the evo motor instead.
https://partsfinder.onlinemicrofiche...UEL%20INJECTED
Last edited by Dano523; Apr 21, 2021 at 08:39 PM.