Jetting?
Thread Starter
|
Advanced
Joined: Jun 2011
Posts: 82
Likes: 0
From: WNC
Jetting?
Sorry if this is old hash...I just checked my (new to me) 04 carb jetting after discovering that the mixture screw was 4 turns out. Main was 180 (less than 190 stock?)...and the low speed was a stock 45.
I didn't have anything in my Sportster jet assortment larger than 180, but I did swap the pilot for a 48, which resulted in a mixture of barely 2 turns out.
Bike has the SE Heavy Breather, and SE slip-ons...any suggestions on the main at 2300' elevation? (my riding area can easily go from 1200' to 4000' in a day's ride.
Also, during a day's ride yesterday, she developed an awful noise that sounded like metal against metal...only at idle. Scared the crap out of me, couldn't pinpoint it. Finally pulled off the road and was getting ready to put my ear close to the cam chest...laid my hand on the right front peg which is mounted on a highway bar...and half the noise stopped! Turns out that both those pegs were mounted without the spring washers, so they were vibrating like crazy at idle only every once in awhile!
Whew!
I didn't have anything in my Sportster jet assortment larger than 180, but I did swap the pilot for a 48, which resulted in a mixture of barely 2 turns out.
Bike has the SE Heavy Breather, and SE slip-ons...any suggestions on the main at 2300' elevation? (my riding area can easily go from 1200' to 4000' in a day's ride.
Also, during a day's ride yesterday, she developed an awful noise that sounded like metal against metal...only at idle. Scared the crap out of me, couldn't pinpoint it. Finally pulled off the road and was getting ready to put my ear close to the cam chest...laid my hand on the right front peg which is mounted on a highway bar...and half the noise stopped! Turns out that both those pegs were mounted without the spring washers, so they were vibrating like crazy at idle only every once in awhile!
Whew!
Road Warrior
Joined: May 2010
Posts: 1,382
Likes: 4
From: Kennewick, WA
Sorry if this is old hash...I just checked my (new to me) 04 carb jetting after discovering that the mixture screw was 4 turns out. Main was 180 (less than 190 stock?)...and the low speed was a stock 45.
I didn't have anything in my Sportster jet assortment larger than 180, but I did swap the pilot for a 48, which resulted in a mixture of barely 2 turns out.
Bike has the SE Heavy Breather, and SE slip-ons...any suggestions on the main at 2300' elevation? (my riding area can easily go from 1200' to 4000' in a day's ride.
Also, during a day's ride yesterday, she developed an awful noise that sounded like metal against metal...only at idle. Scared the crap out of me, couldn't pinpoint it. Finally pulled off the road and was getting ready to put my ear close to the cam chest...laid my hand on the right front peg which is mounted on a highway bar...and half the noise stopped! Turns out that both those pegs were mounted without the spring washers, so they were vibrating like crazy at idle only every once in awhile!
Whew!
I didn't have anything in my Sportster jet assortment larger than 180, but I did swap the pilot for a 48, which resulted in a mixture of barely 2 turns out.
Bike has the SE Heavy Breather, and SE slip-ons...any suggestions on the main at 2300' elevation? (my riding area can easily go from 1200' to 4000' in a day's ride.
Also, during a day's ride yesterday, she developed an awful noise that sounded like metal against metal...only at idle. Scared the crap out of me, couldn't pinpoint it. Finally pulled off the road and was getting ready to put my ear close to the cam chest...laid my hand on the right front peg which is mounted on a highway bar...and half the noise stopped! Turns out that both those pegs were mounted without the spring washers, so they were vibrating like crazy at idle only every once in awhile!
Whew!
Also google your carburator and see if they give tuning advice.
Road Warrior
Joined: Apr 2010
Posts: 1,739
Likes: 10
From: Suffolk, England
A few thunks...
1. Its only an idle mix screw. Doesn't effect the rest of the throttle range (well, maybe a tiny amount but not worth considering).
2. If it aint broke, don't fix it. Nothing wrong with the idle mix screw being 4 turns out. Could be it was set there to get rid of off-idle carb farts. What was wrong with how the bike was running?
3. A 48 pilot is big. Rarely needs more than a 45, even for stage-1. Having the mix screw out 4 turns is fine, it won't effect the MPG but having too big a pilot jet could mean you are running too rich a lot of the time and wasting fuel - especially at altitude.
1. Its only an idle mix screw. Doesn't effect the rest of the throttle range (well, maybe a tiny amount but not worth considering).
2. If it aint broke, don't fix it. Nothing wrong with the idle mix screw being 4 turns out. Could be it was set there to get rid of off-idle carb farts. What was wrong with how the bike was running?
3. A 48 pilot is big. Rarely needs more than a 45, even for stage-1. Having the mix screw out 4 turns is fine, it won't effect the MPG but having too big a pilot jet could mean you are running too rich a lot of the time and wasting fuel - especially at altitude.
Thread Starter
|
Advanced
Joined: Jun 2011
Posts: 82
Likes: 0
From: WNC
Only issues were carb farts and decel popping, also had to give it a bit of fuel for quick starts when hot.
I had stopped by the dealership to pick up a replacement petcock (original was leaking) and had asked them what jets they typically start with...they suggested 48/195 with my mods. The dealership that did the mods for the original owner sits about 1000' higher than where I am.
I had stopped by the dealership to pick up a replacement petcock (original was leaking) and had asked them what jets they typically start with...they suggested 48/195 with my mods. The dealership that did the mods for the original owner sits about 1000' higher than where I am.
Thread Starter
|
Advanced
Joined: Jun 2011
Posts: 82
Likes: 0
From: WNC
Just took it out for a spin...45 miles...no more popping on decel and no carb farts. 180/48, 2 turns out on the mix, slightly higher idle adjustment than previous (no tach), only slightly better hot starts.
Trending Topics
Cruiser
Joined: Apr 2011
Posts: 234
Likes: 2
From: Southern NM
After a decent cruise, how do the plugs look? That will tell you for sure if its too lean or rich..
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
Jason Momoa Is Turning Classic Harleys Into PHEVs
Verdad Gallardo
Harley-Davidson Fat Boy Becomes a Dark, Decepticon-Inspired Custom
Verdad Gallardo
6 Weirdest Harley-Davidsons Ever Sold to the Public
Verdad Gallardo
7 Times Harley-Davidson Chucked Tradition Out the Window
Verdad Gallardo
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
Thread
Thread Starter
Forum
Replies
Last Post
