1500 problem


Information and questions on GL1500 Goldwings (1988-2000)
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robert wilson
Posts: 5
Joined: Sat Jul 20, 2013 10:38 pm
Location: wever
Motorcycle: 1988 gl1500

1500 problem

Postby robert wilson » Sun Jul 21, 2013 5:50 pm



I have a 1988 1500 wing. It started out bucking from 30 to 55 mph. I used seafoam and it stopped. Then about a month later it came back only worse. I tried seafoam again but didn't solve it.It would die when I downshifted.It will start in full choke and run at half choke,If i give it throttle it sometimes dies. With engine off and twisting throtle, fuel flows good out of small half inch tubes in carb.I put new fuel filter on and also sprayed carb cleaner under and around carbs and no change in rpm. What should I try next?



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virgilmobile
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Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 1500 problem

Postby virgilmobile » Mon Jul 22, 2013 7:04 am

My 88 had 7 vacuum lines bad.
One was under the carb rubber mat.All day job.

robert wilson
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Joined: Sat Jul 20, 2013 10:38 pm
Location: wever
Motorcycle: 1988 gl1500

Re: 1500 problem

Postby robert wilson » Tue Jul 23, 2013 1:01 pm

Thank You
All the lines I see look ok but I may be missing something. I have never worked on a cycle before and can't afford to take it in. I have most of the fairing off and air filter out. With the engine off and twisting the throttle,fuel flows good. With it running, giving a little twists and it wants to die. It will not run unless choke is on over half way.back choke off and it dies. I started to think fuel pump but new fuel filter is full . Thinking more on carberator and vac lines.
Thank you for your reply

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virgilmobile
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Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 1500 problem

Postby virgilmobile » Tue Jul 23, 2013 1:50 pm

The vacuum lines have a tendancy to deteriorate at the sharp 90* bends.
2 on the carb.2 on each intake manifold,2 on a valve inside the frame(right side by the pressure switche's) 1 under the carb assembly.
Also twist the throttle and verify the slides pop about half way up.Diaphragms do fail.
The carbs may also have trash in them.Acessable through the top of the radiator are 2 flat head drain screws.open each one.they drain on the right side of the engine in a small hose.
If they won't drain,blow compressed air into the metal vent pipe near the gas cap area.
Just loose them a couple of turns.Dont try to remove them.
I had water condense in mine and plugged the main jet.Draining the bowls and blowing the trash out fixed it.Sea foam didn't help.

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bstig60
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Location: Nevada City, CA. Jupiter, FL.
Motorcycle: 1999 GL1500AC ASP
1999 Virago XV1100LC
1994 Time Out Camping Trailer
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Re: 1500 problem

Postby bstig60 » Tue Jul 23, 2013 10:25 pm

Sounds like you are not getting fuel. Trash or water in the float bowls will really foul things up. How much Seafoam did you use?
Bill

robert wilson
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Motorcycle: 1988 gl1500

Re: 1500 problem

Postby robert wilson » Tue Jul 23, 2013 10:43 pm

two can of seafoam in four tanks of gas.

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bstig60
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Motorcycle: 1999 GL1500AC ASP
1999 Virago XV1100LC
1994 Time Out Camping Trailer
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Re: 1500 problem

Postby bstig60 » Tue Jul 23, 2013 10:48 pm

That's strong enough.... Pull one of your plugs and take a look of the color of the tip. Is it white, tan or black?
Bill

robert wilson
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Joined: Sat Jul 20, 2013 10:38 pm
Location: wever
Motorcycle: 1988 gl1500

Re: 1500 problem

Postby robert wilson » Wed Jul 24, 2013 7:39 pm

The plug is tan. I didn't find any hoses leaking air. Somthing has changed. It will start on choke and run with choke off. Before, I had to have choke on over half for it to run and not die. I put a vacume on petcock but could not blow air through it. on hooking vac line back on it seems to work.
An other change is the idiol. Befor it would idiol around 800 rpm. Now it won't go below 1500 rpm .
I have Idiol adjustment screw backed all the way out

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bstig60
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Location: Nevada City, CA. Jupiter, FL.
Motorcycle: 1999 GL1500AC ASP
1999 Virago XV1100LC
1994 Time Out Camping Trailer
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Re: 1500 problem

Postby bstig60 » Wed Jul 24, 2013 11:16 pm

It's likely a vacuum leak somewhere.
Bill

robert wilson
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Motorcycle: 1988 gl1500

Re: 1500 problem

Postby robert wilson » Thu Jul 25, 2013 7:53 am

Thank You. I will continue to look for leaks. I haven't been able to see much under and around carbs. I have been spraying carb cleaner into that area and no change in rpm. Will I have to pull carbs in order to look at and check vac lines?
I'm still baffled at what changed from having to run on 3/4 choke to no choke. Wondering if pehaps the petcock valve might have been stuck? But if it was, would it have run at all?
My wife said my white hair is starting to look thinner.
Thanks for your help
Robert

fnickel
Posts: 66
Joined: Mon Oct 29, 2012 7:59 pm
Location: Campbellville, ON, Canada
Motorcycle: 1992 GL1500SE

Re: Carb drain screws

Postby fnickel » Sun Jul 28, 2013 6:17 am

Hey VirgilMobile,
I caught your comment on draining the carb float bowls. Can you please give a more detailed description on where those flat headed screws are located, and how to access them. You mention through the top of the rads. I like to drain the carb float bowls on any of my equipment before storing them for winter (we are up in Canada). It just flushes out the accumulated junk and prevents gunk from forming in the float bowls. It also makes for a much easier start-up in the spring. I like to drain the carbs, and fill the fuel tanks (to prevent rust). Thanks for your assistance.

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virgilmobile
Posts: 7659
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 1500 problem

Postby virgilmobile » Sun Jul 28, 2013 9:14 am

When I get to my computer(mobile right now),ill get some pictures .




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