Goldwing GL1500 carb question


Information and questions on GL1500 Goldwings (1988-2000)
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airpane
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1992 Gl 1500A
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Goldwing GL1500 carb question

Postby airpane » Sun Jan 22, 2012 7:41 pm



Whie at idle the rpm surges up and down. The idle screw has to be set too high and it is hard to start when it is cold. This bike sat up for bout three years. t did have fuel stabalizer in it. It hesitates when taking off. I removed the airbox and filter. I started the bike with th airbox and filter removed. When put my finger over the taller of the two brass fittings in the carb veturi, the one to the right of the accellerator pump fitting the bike runs smoother and idles higher. Then I can reduce the idle screw setting and the bikile runs smoohly at 1000 rpm and the engine does not surge up and down. I think I have vaccum leak.

What is tis taller of the two brass fittings. What am i changing when I put my finger over it. Also if I put my finger over the same one in the other carb venturi the bike idles at a lower rpm and uns rougher again.

I have made a video of it doing this and am going to post it to youtube so you can see what it does.



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airpane
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Re: Goldwing GL1500 carb question

Postby airpane » Sun Jan 22, 2012 8:15 pm






Above is the shrtcut to the video on youtube.

I think.

James :|

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WingAdmin
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Re: Goldwing GL1500 carb question

Postby WingAdmin » Sun Jan 22, 2012 9:47 pm

The video's not showing there...did you get the address right?

Oh, never mind, it just says the video is still being processed...it will show up soon, I'm sure.

I know one time I had my 1500 out and had the exact same problem, and it turned out I had left the choke on without realizing it, so the mixture was too rich. It gave me the same symptoms - high idle, and surging up and down. At least something to start looking at.

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airpane
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1992 Gl 1500A
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Re: Goldwing GL1500 carb question

Postby airpane » Sun Jan 22, 2012 9:55 pm

YEs that is the right address. Don't know why it wont work. I checked the choke enrichners on the front and back of the carbs and they are not stuck on. The choke cable works. When the choke is applied the rpm goes up like it should and when turned off it goes back down .

I double clicked on the video and it said the vieo is still being processed. Maby it will work later. :?:

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airpane
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1986 GL 1200 SEi

Re: Goldwing GL1500 carb question

Postby airpane » Mon Jan 23, 2012 8:06 am





O.k. had to upload the video again. Here is the new link.

James ;)

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cbx4evr
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Re: Goldwing GL1500 carb question

Postby cbx4evr » Mon Jan 23, 2012 11:57 am

I'm going to assume that you put fresh gas in it. I always like to look for simple solutions before making it hard on myself. I would add a can of Sea Foam to the fuel and take it for a drive until that tank of fuel was gone.

After that if the problem is still there you may find some answers on Randaak's site or by contacting him.

http://www.randakks.com/
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

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WingAdmin
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Re: Goldwing GL1500 carb question

Postby WingAdmin » Mon Jan 23, 2012 12:11 pm

I haven't had my GL1500 carbs apart, so I'm going to go with some generalizations based on what I DO know.

I know that the GL1500 will idle higher when the choke is engaged, which enrichens the mixture.

I know that if the GL1500 has the choke engaged when the engine is already warm, it will surge exactly the way your bike is surging.

So from that I'm going to hypothesize that when the fuel/air mixture is too rich, the engine surges.

You show in the video that it's not happening too bad, but that when you install the air box/filter, it is much worse. The filter limits the amount of air somewhat - which enrichens the mixture.

Not necessarily causality, but it's the road I would probably start investigating - after doing the simple fix of a can of Seafoam through a fresh tank of gas. In my experience with my 1100, any time I had any kind of odd-behaving carb-related issues, a can a Seafoam always fixed the problem.

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virgilmobile
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Re: Goldwing GL1500 carb question

Postby virgilmobile » Mon Jan 23, 2012 12:47 pm

This post should help.I've found many deteriorated vacuum lines,even on the manifold.The carb is controlled by a "carb control module" and it operated a few electric valves,so a leak on any vacuum line can cause running problems.
Last night , after re-assembly,mine would not rev up at all.It idled fine.I pulled a vacuum line loose from a "T" connector on the right side of the carb assembly.Just one lousy leak. :(

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airpane
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Re: Goldwing GL1500 carb question

Postby airpane » Tue Jan 24, 2012 5:53 am

O.K. got it fixed. I found two vaccum leaks. One on the left side of the intake manifold and one on the automatic fuel cut off valve vaccum line. Also found tha the filter in the sub-air system was almost completely stopped up. It now idles at 950 rpm withut surging and is smooth off of the line, no hesitaton when rolling into the throtle. Now on to the cruise control. :arrow:


Thanks for the help

James

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tech1
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Re: Goldwing GL1500 carb question

Postby tech1 » Fri Feb 24, 2012 8:59 pm

Hi i was wondering your vacume leaks . How did you find them? Split hoses and see them rt hear or use carb cleaner and watch the RPM rise?
Thanks Tech1

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virgilmobile
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84 GL 1200 I

Re: Goldwing GL1500 carb question

Postby virgilmobile » Fri Feb 24, 2012 10:29 pm

On my 88,I gently pulled on all the hoses that had a 90* bend in them.I found that the hose would stretch rather easily.On one hose under the carbs,when I tugged on it,it pulled like a rubber band and popped open.
SO I generally just replaced all the vacuum lines that had a sharp 90* in them.
I found 1 on each side(intake manifold)1 under the rubber mat that's under the carbs and 2 on the carbs themselves.
All the rest of the hoses checked ok.




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