Possible Vacuum Leak??
Cruiser
Joined: Oct 2017
Posts: 147
Likes: 158
From: Colorado Springs
How about the throttle cables, adjustment, lubed, sticking? Does the throttle plate snap closed when you let go of throttle? Does the bike idle up if I turn the front end to the right on kick stand or up and down?
Seasoned HDF Member
Joined: Nov 2006
Posts: 21,089
Likes: 19,250
From: The Wasteland
OP, turn the bars from lock to lock on the kickstand and standing up and see if it affects the idle speed.
Thread Starter
|
6th Gear
Joined: Nov 2023
Posts: 10
Likes: 0
From: TX
Cables have been lubed. No sticking. I've also checked that the carb snapped back and it does and also turned the bars lock to lock as well. Nothing seems to change.
Thanks for the ideas though. It seems to me that something in the carb is not right. As I stated, if I turn the idle speed screw in just slightly past 1050 rpm's, the rpm's jump up a couple hundred as well. Going below 1050, it responds as it should. Very strange.
Thanks for the ideas though. It seems to me that something in the carb is not right. As I stated, if I turn the idle speed screw in just slightly past 1050 rpm's, the rpm's jump up a couple hundred as well. Going below 1050, it responds as it should. Very strange.
HDF Community Team
Joined: Dec 2011
Posts: 8,601
Likes: 4,039
From: San Diego, CA
You might have the throttle butterfly right on the edge of the transition ports. What size pilot jet do you have? Are all the parts of the idle mix screw there? Spring, washer, and o ring?
Have you tried the "idle drop method" of tuning the mixture? Back the speed screw off (lower rpm) and adjust mixture screw accordingly. All I can think about that 200 rpm jump is that you exposed the transition ports. It should be running on the mixture screw port at idle.
John
Have you tried the "idle drop method" of tuning the mixture? Back the speed screw off (lower rpm) and adjust mixture screw accordingly. All I can think about that 200 rpm jump is that you exposed the transition ports. It should be running on the mixture screw port at idle.
John
Last edited by John Harper; Nov 12, 2023 at 08:22 AM.
Thread Starter
|
6th Gear
Joined: Nov 2023
Posts: 10
Likes: 0
From: TX
I believe the pilot jet was a 42 but I need to check again. The idle mixture screw, spring, washer and oring are all new.
I tried adjusting the idle mixture at around 950 and then bumped up the speed but no change. I agree that it seems to be transitioning out of the idle circuit. It seems like maybe the idle speed screw is turned in more than it should be to get the correct idle. Not a lot of threads left and it will bottom out.
I tried adjusting the idle mixture at around 950 and then bumped up the speed but no change. I agree that it seems to be transitioning out of the idle circuit. It seems like maybe the idle speed screw is turned in more than it should be to get the correct idle. Not a lot of threads left and it will bottom out.
Last edited by Ford_F100_1972; Nov 12, 2023 at 08:36 AM.
Thread Starter
|
6th Gear
Joined: Nov 2023
Posts: 10
Likes: 0
From: TX
I think I will do that. My thought is that maybe it's running too lean at idle because of too small of a pilot jet. Of course, I could be totally wrong! That's why I ask for advice. Thank you!
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
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
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
Thread
Thread Starter
Forum
Replies
Last Post