1985 GL1200 idle issue


Information and questions on GL1200 Goldwings (1984-1987)
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1985GL1200
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Motorcycle: 1985 Honda Goldwing

1985 GL1200 idle issue

Postby 1985GL1200 » Sun Jun 08, 2014 7:09 pm



Just bought my latest toy from an older gentleman. When I went to get it, it would start and idle but very rough, seemed to get better after the rpms came up and it got warmed up , but still not smooth like I know it should be. Rode it home and did some short rides, no better. Now I am fairly mechanical minded, so here I go. Got it in to my garage and started playing with it. Started pulling plug wires and found that neither LH cyls were firing at idle, took the throttle link off and I have to get to about 1/4 throttle and the they will both seem to fire good, the other side is responsive off the bottom right away. I know nothing about motorcycle carbs so I'm in the dark. My thought is Idle jet plugged? But my nest thought is why both at the same time? I took the vac screw out of the base of the intake runner on both and dribbled carb cleaner in them and they came to life. Am I on the right track, and how hard is it to take the carbs off? FYI the bike sat for about three years.



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HALBUDD
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Re: 1985 GL1200 idle issue

Postby HALBUDD » Sun Jun 08, 2014 7:57 pm

I would get a can of sea foam and put it in the tank and then take her for a ride to get the sea foam in the carbs. If the bike has been setting I would also change the fuel filter and check the tank for crud. The sea foam will do a pretty good job of cleaning up your carbs. This would be a lot easier fix then taking the carbs apart and may just fix your problem.
A woman that can use tools is worth her weight in gold !!

BigBro
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Re: 1985 GL1200 idle issue

Postby BigBro » Sun Jun 08, 2014 10:11 pm

You might have to run it a few times to get it warmed up then park it overnight and do If again with the seafoam in there. Idle jets. Are tiny and it sounds like they are really plugged. If that don't work you are in for a carb cleaning. Not too hard and lots of info to help out.

1985GL1200
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Re: 1985 GL1200 idle issue

Postby 1985GL1200 » Mon Jun 09, 2014 7:05 pm

I ran a tank of gas through it with a half a can of sea foam in it already, then filled it and put the other half can in it, drove it about ten miles and let it sit over night and then let it set and idle some more and it still is giving trouble. Is there a way to access the idle circuit without removing the carbs, looks like a pain in the upper leg. Just hoping not to have to remove them if I don't have to. :(

BigBro
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Re: 1985 GL1200 idle issue

Postby BigBro » Mon Jun 09, 2014 10:54 pm

There is no way to clean the internals of the carbs without pulling them off the bike.

You basically have two choices, keep trying to clean it and clear it with the seafoam concentrations and short run cycles leaving the bike sit overnight. or pull the carbs for a full cleaning.

As I write this one thing just came to mind that you could try but I can't say it would give results and has the possibility of getting messy.

First get yourself some safety glasses and put them on. Safety First....
Essentially the thought goes like this, you have hopefully already softened anything that might be in that idle circuit but it is still plugging the circuit for whatever reason. Make sure you have your Safety Glasses on. You pull the idle screw for that carb out and use some air pressure to blow through that opening back into the carb. It will blow into the venturi but also backwards through the idle circuit to the bowl. You could possibly even try some modest carb cleaner as recommended by Yamaha or Honda. Those sprays are pretty good. Once you have done this you might want to drain that bowl, then put it back together and see if it runs any better.

No Guarantees that it will work and it may only partially clean that circuit but who knows.

Again make sure you put on your Safety glasses.

1985GL1200
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Re: 1985 GL1200 idle issue

Postby 1985GL1200 » Tue Jun 10, 2014 9:15 pm

I would like to blow back through the idle mixture screw, but at the risk of sounding stupid, I can't find it and I have looked. Does anyone know how I could get a schematic of the carbs? I really appreciate all the in put, but I really don't want to pull the carbs off, it looks like a real pain in the butt. looks like I have to disassemble half the bike.
Thanks Ed

BigBro
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Re: 1985 GL1200 idle issue

Postby BigBro » Tue Jun 10, 2014 9:55 pm

Here is a picture of one Idle screw. It is either front left carb as sitting on the bike or back right carb as sitting on the bike.
Idle screw marked
Idle screw marked

They may be under soft plugs and to remove you would need to drill small hole and then use a small screw into them to pull it out.

Be careful not to lose the spring, washer and oring that are on that idle screw.
Each carb has an idle screw and they are typical lower outboard facing front or back so you could reach each one of them.

Hope that helps

1985GL1200
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Re: 1985 GL1200 idle issue

Postby 1985GL1200 » Wed Jun 11, 2014 9:25 pm

Thanks, I'll try that tommarrow. got home late tonight and don't have time. I really appreciate the help.

1985GL1200
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Re: 1985 GL1200 idle issue

Postby 1985GL1200 » Fri Jun 13, 2014 4:54 pm

Ok, I took the screws out and blew some cleaner into the jets, it seems to better after the bike warms up but I'm still getting a blup blup periodicly from the exaust at an idle. And it still runs rough until about 1800 RPM. It's a lot better. I'm Thinking I need to just ride it and hope it comes out of it. Or is there something else I could try, you've been right on the money so far. I guess I should also mention that when it gets hot it tries to kick back when I start it. Normal? Running a lot better down the road too.

BigBro
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Re: 1985 GL1200 idle issue

Postby BigBro » Fri Jun 13, 2014 6:49 pm

Did the idle screws have plugs over them?
Essentially if that helped then unless a bit of,rust or other debris got in through bowl vent you should be dealing with a soluble plug of gunk. It may break down or it could plug up. Just don't know.

Could try bowls and while drain screw is out, try flushing that idle port again
Otherwise put about 1oz of atf per gallon of fuel for a while. It may continue to improve overtime.

It sounds like exhaust is telling you lean cylinder. I would consider opening that idle mix screw w more until it is better.

It really sounds like carb overhaul is in order but you might get by for the season. IDK.

Good Luck

1985GL1200
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Re: 1985 GL1200 idle issue

Postby 1985GL1200 » Sat Jun 28, 2014 8:07 am

I have run about 20 gals of gas through the old girl, and it seems to be getting better all the time or at least I'm getting more tolerable. Trying 100 octane av gas this weekend, maybe that'll flush her out. Had a hell of a tornado go through town last, that's why I haven't been back here lately. Everybody made it out alive just a massive clean up. Going to try and ride some this weekend. Talk to you guys soon.

BigBro
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Location: Port Orchard, Wa and John Day, Oregon
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Re: 1985 GL1200 idle issue

Postby BigBro » Sat Jun 28, 2014 9:41 am

First. Glad to hear you and everyone else made it through weather event safely. Those can be so haza.
hazardous.
On the bike glad to hear it may be improving. Not sure the avgas will help. The, burn timing is wrong for these engines but it may have an additional cleaning item. Also not sure how 30 year old rubber will like it.

If it is reusable now and firing on all cylinders best you could do is keep riding it and use about 4oz of atf per tank through season. It may get better or stay same.

It probably still needs a carb cleaning overhaul this winter.

flash1942
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Re: 1985 GL1200 idle issue

Postby flash1942 » Sun Jun 29, 2014 9:07 am

If you do take the carbs apart, put in one size up larger idle jet. It will help it come off idle to speed better. Av gas has lead in it so I would try copious amounts of Seafoam and keep trying. Also see if you can find ethanol free gas and try that as well.

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Re: 1985 GL1200 idle issue

Postby WingAdmin » Mon Jun 30, 2014 10:23 am

100LL avgas is a really bad idea for your bike. Not only can the lead clog up the ultra-fine jets in your carbs, it can damage valves, valve seats and seals. Avgas is intended for low-RPM, large bore, long-stroke engines. Your bike has a high-RPM, small bore, short stroke engine.

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Ed Z
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Re: 1985 GL1200 idle issue

Postby Ed Z » Tue Jul 01, 2014 10:26 am

My 87 ran pretty good but I knew it could be better... I purchased a good kit (from Randakk) and read up all I could find about rebuild these carbs... I have rebuilt many carbs in my life but these were right up there as far as skill requirements go... If you take your time and do one at a time, you should be able to get through just fine... Be sure to do all the linkage adjustments by the book and it helps a lot to have (or make) a manometer to balance em after the rebuild...
My bike gained a good deal more low end torque and ran much smoother afterwards... I do recommend spending the $ to get the very best rebuild kit (I like Randal Washington’s kits)... Also, do be really careful with that carb cleaner spraying you mentioned doing... That stuff dissolves the rubber parts in your carb (highly undesirable)... Went I use carb cleaner during the rebuild process, I always rinse the parts of with hot water and then blow them dry with compressed air... Ideally one would use a sonic cleaner to clean the parts though...


http://randakks.com/collections/kits

1985GL1200
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Re: 1985 GL1200 idle issue

Postby 1985GL1200 » Sun Jul 27, 2014 7:53 pm

Well I've been riding it a little, as much as time will let me. I think it's improving, I think I need to ride it more, thinking about going to Sturgis. Wife doesn't think so, might just leave her home. Really starting to like the bike. I do have a question though. I would like to get a set of helmet head sets that will plug in, but everything I have found, the speakers are too thick for my new helmets. Damn it! the new J&M sets probably would work but, but holy cow $$$. Any suggestions. Can I wire in a different set of speakers to the old style head sets? Don't want to cut them apart and then find out that it won't work.

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Ed Z
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Re: 1985 GL1200 idle issue

Postby Ed Z » Sun Jul 27, 2014 8:55 pm

Too thick or top big around ??? Hard to imagine any helmet thinner that the speakers... Mine are about 1/2" thick and only cost about $60 (including intercom mic)... If it's an issue of the diameter then ya can usually remove some of the Styrofoam to enlarge the ear pocket area...

1985GL1200
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Re: 1985 GL1200 idle issue

Postby 1985GL1200 » Tue Jul 29, 2014 8:34 pm

Ya, the pockets aren't really big enough around either, but my oem speakers are about a half an inch thick and when I get them in the pockets it squishes my ears tight against my head. Kinda uncomfortable. I saw somewhere someone offered speakers that were 5mm thick but they were for a blue tooth set up. I don't want to go through the high dollar conversion to put blue tooth on it. Don't really want to talk to my wife that bad. Hope she dosnt read this. Kinda in a quandry as what to do.

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Ed Z
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1987 gl1200 Aspen
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Re: 1985 GL1200 idle issue

Postby Ed Z » Wed Jul 30, 2014 9:52 am

I just pulled back the covering on my helmet and adjusted the foam (diameter and depth) to accommodate the speaker... Then I just placed the black cover material back over it...

1985GL1200
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Re: 1985 GL1200 idle issue

Postby 1985GL1200 » Thu Jul 31, 2014 11:11 pm

I'll give it another look, thanks.

rzaugg
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Re: 1985 GL1200 idle issue

Postby rzaugg » Sat Aug 02, 2014 10:09 pm

I went a different route. My Wing didn't have an intercom system on it. New world, old bike. Bought a pair of helmets for between $130-$140 that have the speakers mounted already, are blue-tooth capable and will link with each other. Good sound quality, blue tooth works with our phones (iphone4s). Wife plays music when on her shadow and she loves it. Can even use the voice texting with them. Made by VCan, with Blinc Bluetooth.

P.S. Mine saved my life too.

1985GL1200
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Location: Wessington Springs SD
Motorcycle: 1985 Honda Goldwing

Re: 1985 GL1200 idle issue

Postby 1985GL1200 » Mon Oct 20, 2014 8:24 pm

Just an update. Got the idle issue taken care of and didn't have to remove the carbs. Started to take the carbs off and when I got the intake elbows off noticed the idle ports. Sprayed carb cleaner in them a few times then blew air back through them and heard the sound of the air change, so I quick put every thing back together and I'll be darned if the dumb thing idle on all four. Resynced the carbs and it runs like a dream. Glad I didn't give up on short cuts. Still haven't found any intercoms cheap yet but do love riding the old girl. Thanks to everyone on the input, really appreciate it. Ride safe everyone.

tmc2009
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Re: 1985 GL1200 idle issue

Postby tmc2009 » Mon Nov 03, 2014 1:38 pm

1985GL1200 wrote:Just an update. Got the idle issue taken care of and didn't have to remove the carbs. Started to take the carbs off and when I got the intake elbows off noticed the idle ports. Sprayed carb cleaner in them a few times then blew air back through them and heard the sound of the air change, so I quick put every thing back together and I'll be darned if the dumb thing idle on all four. Resynced the carbs and it runs like a dream. Glad I didn't give up on short cuts. Still haven't found any intercoms cheap yet but do love riding the old girl. Thanks to everyone on the input, really appreciate it. Ride safe everyone.


what RPM does she idle at?

1985GL1200
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Re: 1985 GL1200 idle issue

Postby 1985GL1200 » Tue Nov 04, 2014 9:17 pm

Idles really nice and smooth at 1000 RPM. I am tickled pink. I have put another 1000 miles on it since my last post. Now I think it's time to give in to winter, gonna put it away for the season. Thanks everyone for your in put and advise. Good ridin to those who can.

1985GL1200
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Re: 1985 GL1200 idle issue

Postby 1985GL1200 » Wed Dec 31, 2014 10:18 pm

Here's another update. Took the bike out for a spin on Dec. 7th. Unheard of in South Dakota in the winter time, but it was 56 degrees and I couldn't resist. Rode about 110 miles, everything worked awesome and ran like a champ. Can't wait till spring gets here now. My kids gave me a gift cert. to get my intercoms for my helmets. Has anyone ever had anything to with or ever heard of UClear HBC100 Bluetooth intercoms. Are they worth the money? I really like the idea, along with Sena sm10 and the adapter cord for the bike. Kinda pricey but I would sure hate to disappoint the kids ya know. ;) Just thought I would through that out there and see what you guys thought. Merry Christmas and have Happy New Year. Let's all pray for warmer weather, as I write this I'm looking at my outside temp and it says -14. I'm staying inside tonight.




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