I am stymied....vacuum leak.

[Nessism]

Ran all the checks and came up clean, very clean carbs. The problem slowly came on at the end of a 1000 mile ride and got worse as time passed. I am running a stage one kit and have always run the pilots around 11/2 turns. If I go much more I get a hanging idle. Still tweaking them but may be a while now as other things get in the way. She does turn up fairly good now just waiting for the hammer to drop again.

i wonder if a set off a 83 1000G would work….

V

The pilot screws control fuel flow. More open, more fuel. They are not air bleeds. You might want to try 3 turns open, and see what happens.

[gustovh]

3 turns open means really bad hanging idle. I know what the screws adjust, have synced to straight across the board. Maybe I’ll try my blue tune and see what I get.

V

[Spiff]

3 turns open means really bad hanging idle. I know what the screws adjust, have synced to straight across the board. Maybe I’ll try my blue tune and see what I get.

V

3 turns out should be flooding the engine with gas not making it hang.

[gustovh]

Yes, the hanging idle comes from burning off the excess fuel when the throttle is closed. The carbs as stated have the stage 1 treatment, so normal input does not always equal normal results when tuning.

V

[Nessism]

Yes, the hanging idle comes from burning off the excess fuel when the throttle is closed. The carbs as stated have the stage 1 treatment, so normal input does not always equal normal results when tuning.

V

Actually, no. A hanging idle is caused by a lean condition, not rich.

[gustovh]

Yes and no. If I turn my pilots more than 11/2-13/4 turns out I get a hanging idle, idles good at 11/2 turns. Go figure

V

[pdqford]

3 turns open means really bad hanging idle. I know what the screws adjust, have synced to straight across the board. Maybe I’ll try my blue tune and see what I get.

V

Yep, it is time for the blue tune!
What is the color @ 1.5 turns out and 3.0 turns out?
Pilot screws have good o-rings?
At 3 turns out do you think the pilots are sucking air?

[gustovh]

Won’t get to the blue tune till this weekend maybe, have another project that I’m working on.

image.jpg

[Nessism]

Yep, it is time for the blue tune!
What is the color @ 1.5 turns out and 3.0 turns out?
Pilot screws have good o-rings?
At 3 turns out do you think the pilots are sucking air?

Maybe the O-rings start to leak if the pilot screws are open more than 1.5 turns?

gustovh Did you replace all the O-rings recently (last 5 years or so?)

[gustovh]

I did that that is how I know what it does. Doesn’t even want to run 3 turns out. Fresh O rings and seals. New intake pipes. Possible throttle shaft seals as Big T throws out. Have not ridden since last adjustment or looked at the plugs yet.

V