GL1100 Idle mixture screws do nothing


Information and questions on GL1100 Goldwings (1980-1983)
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joethans
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GL1100 Idle mixture screws do nothing

Postby joethans » Mon Feb 01, 2016 1:57 pm



So I recently rebuilt my carbs and I finally got around to adjusting the idle mixture screws like it says in my Clymer manual... problem is, it seems like the idle mixture screws have almost no effect on my idle RPMs. The difference between fully screwed in and 4 full turns out is only about 20 RPMs max. And yes I'm using a accurate external tachometer.

Is this a sign that something is wrong? or is this normal? Maybe I should just leave them at their recommended setting and leave well enough alone.

Appreciate your thoughts.



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ct1500
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Re: GL1100 Idle mixture screws do nothing

Postby ct1500 » Mon Feb 01, 2016 5:52 pm

What RPM is your engine idling at now? If too high the mixture screws will have little effect.
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joethans
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Re: GL1100 Idle mixture screws do nothing

Postby joethans » Mon Feb 01, 2016 5:57 pm

Idling right around 1000 RPM. Also I just recently synced the carbs

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RBGERSON
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Re: GL1100 Idle mixture screws do nothing

Postby RBGERSON » Tue Feb 02, 2016 8:10 am

Reset idle screw as low as possible just before the engine stalls..then try your "air" mix screws..also someone could have broken the tips off in the carbs..have you pulled them to see if they are still complete?

Note air mix screws are really gas mix screws...
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joethans
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Re: GL1100 Idle mixture screws do nothing

Postby joethans » Tue Feb 02, 2016 12:02 pm

Thanks I'll try lowering the idle rpms first. I have taken them apart and they all appeared to be fine, but I didn't have really do an in depth inspection

joethans
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Re: GL1100 Idle mixture screws do nothing

Postby joethans » Wed Feb 03, 2016 1:09 am

So I bought the idle rpms down to about 700 and I started to see more of an effect, but not quite the 100 rpm difference that the manual talks about.

The odd thing is I have the idle mixture screws set at different positions for each carb.

But the engine seems to be running fine so I think I'll just leave it alone!

Thanks for the help.

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Re: GL1100 Idle mixture screws do nothing

Postby 4wred » Wed Feb 03, 2016 9:19 am

joethans wrote:Thanks I'll try lowering the idle rpms first. I have taken them apart and they all appeared to be fine, but I didn't have really do an in depth inspection


When you pulled out the mixture screws did they have the spring,washer,and o ring in place properly? In the rite order?

joethans
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Re: GL1100 Idle mixture screws do nothing

Postby joethans » Wed Feb 03, 2016 10:51 am

4wred wrote:When you pulled out the mixture screws did they have the spring,washer,and o ring in place properly? In the rite order?

Yep, everything was there. And I even replaced them with the parts from Randakk's rebuild kit.

Although occasionally I'll notice a couple drops of gas collecting on the #4 idle mix screw. I'll check again next time I pull the carbs.

I'm surprised it runs as well as it does!

indianakid
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Re: GL1100 Idle mixture screws do nothing

Postby indianakid » Wed Feb 03, 2016 1:58 pm

Congrats on a successful carb rebuild !!!

your bike is a 1980 so the carbs will have pressed in idle jets. were you able to remove them to be sure they are clean ?

if you take it for a test run let me know and we could meet up.

joethans
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Re: GL1100 Idle mixture screws do nothing

Postby joethans » Thu Feb 04, 2016 4:32 pm

I didn't even try to remove the pressed in idle jets. I just gave em a good spray of carburetor cleaner.

Goldwing carbs must be one of the most complex pieces of machinery on a motorcycle ever.

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Re: GL1100 Idle mixture screws do nothing

Postby Old Fogey » Thu Feb 04, 2016 8:38 pm

If you think the 1100 carbs are complex, you would have real fun with a set of 1000s! :shock:
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Re: GL1100 Idle mixture screws do nothing

Postby 4wred » Fri Feb 05, 2016 8:33 am

joethans wrote:I didn't even try to remove the pressed in idle jets. I just gave em a good spray of carburetor cleaner.

Goldwing carbs must be one of the most complex pieces of machinery on a motorcycle ever.



If you didn't remove the slow jets can just about guarantee they aren't clean.If there's any blockage in them a spray of carb cleaner won't do it!!

joethans
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Re: GL1100 Idle mixture screws do nothing

Postby joethans » Fri Feb 05, 2016 12:24 pm

4wred wrote:If you didn't remove the slow jets can just about guarantee they aren't clean.If there's any blockage in them a spray of carb cleaner won't do it!!

Well... I guess I'll just have to use a healthy dose of seafoam until I'm forced to pull the carbs again. Thanks for the tip

ax7el34
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Re: GL1100 Idle mixture screws do nothing

Postby ax7el34 » Fri Feb 05, 2016 9:42 pm

I also have a 1981 1100. The mixture (pilot) screws do not increase rpm but they can eliminate a flutter on the tachometer at idle with an adjustment. That is my experience. You want the rpm needle steady. When I adjusted to 2 turns open, my needle was steady. That is all I would look for with the pilot screw. I think, what means more to performance is balancing the vacuum on all four carbs. I did this by using an inexpensive vacuum gauge. check 3. balance 1 to 3. balance 4 to 3. balance 2 to 3.

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Hoosier Jack
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Re: GL1100 Idle mixture screws do nothing

Postby Hoosier Jack » Tue Feb 09, 2016 5:44 am

My service manual said to twist out the pilot to three full turns. It seemed a bit much and I wonder if I went too far??? Just had them apart to check the float height and set the pilot while it was off the bike.

joethans
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Re: GL1100 Idle mixture screws do nothing

Postby joethans » Tue Feb 09, 2016 1:04 pm

ax7el34 wrote:I also have a 1981 1100. The mixture (pilot) screws do not increase rpm but they can eliminate a flutter on the tachometer at idle with an adjustment. That is my experience. You want the rpm needle steady

Yeah I'm noticing the same thing. Not sure why the Clymer manual mentions a 100+ RPM difference when adjusting the idle screws.

I believe for the 1980 GL1100 the default setting is 1 and 1/4 turns out. not sure what it is for any other model.




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