86 GL1200A Carbs won't sync, won't idle down!


Information and questions on GL1200 Goldwings (1984-1987)
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alanc1100
Posts: 71
Joined: Thu Aug 26, 2010 4:51 am
Location: Lakewood, Wa.
Motorcycle: 1986 GL1200A Aspencade

86 GL1200A Carbs won't sync, won't idle down!

Postby alanc1100 » Fri Sep 12, 2014 3:56 am



I just finished up the rebuild of my 86 GL1200A carbs. Man, what a pain in the arse. Anywhoo, I got them installed, got it started (choke only about 1/3) and it idled high for about 1 minute, then had to cut the choke. Idle went to 3500, shut her down. Adjusted idle back about 3 turns CCW and restarted, idled at about 1400. Waited about another minute then backed idle down ALL THE WAY! Still idled about 1150 to 1200. Let her run for about 10 minutes to warm up all the way to operating temp (fan blowing kept the rad fan from coming on). Shutdown and setup the Motion Pro. Restarted and calibrated off #4. Installed the vacuum hoses and restarted. #4 went through the roof, 2 & 3 were close and #1 would not pull anything.
Adj left bank 2 & 4, then moved to the right, #3 set approx where calibration level was and #1 still won't pull vacuum. Tried tightening the manifold bolts and the clamp, to no avail. BTW, pilot screws set at 2 turns out each. This thing just won't idle down. Anyone ever had these problems during sync'ing?



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virgilmobile
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84 GL 1200 I

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby virgilmobile » Fri Sep 12, 2014 8:36 am

Not me.i have seen this tho.The one carb that won't pull a vacuum is the one causing your problems.
Somehow airflow is not being restricted (no vacuum) . Either by a leak at the seal or the throttle plate not closing completly .
This can be just a adjustment or mis-alignment in the coupler(adjuster).

You might remove the down tube at that one carb and visually inspect the throttle plate position .
I usually preset all the throttle plates before I put the carbs back on.its like a pre-sync.
Then use a shop vac to test the slide action on each one.

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alanc1100
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Motorcycle: 1986 GL1200A Aspencade

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby alanc1100 » Fri Sep 12, 2014 2:03 pm

Thanks Virgil, yes, I think the rack is coming back out. I will do the pre-sync and bench test that I should have done before. I'll let you know the results. Thanks again. AL

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alanc1100
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Location: Lakewood, Wa.
Motorcycle: 1986 GL1200A Aspencade

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby alanc1100 » Sat Sep 13, 2014 4:04 am

Well, the carb rack is out for the second time. I went through each carb, one at a time, found two main jets and idle jets loose, one almost to the point of falling out into the bowl. Removed the slides, jets, floats, etc. then recleaned the jets and blew out all the passages again. I had to reset two floats (don't know how I missed them), then reassembled them. Still have to pre-sync the carbs and yes, the #1 is open quite a bit compared to #3 which is closed. #2 and #4 look uneven too. So, first thing in the a.m. I am going to tackle that, reinstall them and try to sync them. Thanks again Virgil, you definitely had the right idea. Will post when I get that done with results.

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virgilmobile
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82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby virgilmobile » Sat Sep 13, 2014 9:42 am

Use a shop vac on each carb.just hold it on the intake tube and operate the throttle.My vac would bring the slides bout half way up.Enough to see if they moved and don't stick.
Even tho they all moved with my finger,I did find one sticking.

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alanc1100
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Motorcycle: 1986 GL1200A Aspencade

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby alanc1100 » Sun Sep 14, 2014 1:51 am

I got all 4 pre-sync'ed. I'm assuming you do the vac test with the tops and springs off? Otherwise, the only other visual means would be the needle seen through the intake side?
Either way, the carbs won't be going back on very soon. I checked the filter and found some crud in it. Filter was brand new, by the way. I took the gas cap off and then took the float level indicator out and there was what looked like sand and rust mixed on the tank bottom. The sides and top all looked good, but the bottom definitely needs cleaning. So, the tank is coming out. Damn this is going to be another big job! I still have to buy new tires and mount them and the stator needs to be checked. No voltage or charging issues, but the stator wire connector has turned brownish tan where the plugs inside actually meet. I took all the connectors apart and used crc electrical contact cleaner, brass brushes and cleaned them all. I put dielectric grease in and on all connections. So, I think I'm good for awhile with the stator.

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virgilmobile
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Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby virgilmobile » Sun Sep 14, 2014 8:58 am

I do the shop vac test with the carbs completly assembled.hold the hose where the assembly bolts to the head.operate the throttle and look in the plenum box at the slides.Use a mirror to see them clearly.

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alanc1100
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Motorcycle: 1986 GL1200A Aspencade

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby alanc1100 » Mon Sep 15, 2014 3:26 am

Thanks for clarifying Virgil. BTW, your Greyhound has gotta be tired! :D

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virgilmobile
Posts: 7650
Joined: Sun Sep 19, 2010 5:39 pm
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Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby virgilmobile » Mon Sep 15, 2014 6:54 am

He passes out bout 10:00 each night.
Back running at 5:30 am.

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alanc1100
Posts: 71
Joined: Thu Aug 26, 2010 4:51 am
Location: Lakewood, Wa.
Motorcycle: 1986 GL1200A Aspencade

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby alanc1100 » Mon Sep 15, 2014 8:34 pm

Okay, got the tank removed, cleaned to near new looking, reinstalled and fueled up. Whew, that is done!

Now, to clean and lube the final drive and get the back end back together. That will have to wait until Tuesday night late. Taking Grad classes...got class tomorrow.

Anywhoo, I hope by Wed or Thurs to have everything back together and I can resume dealing with my tuning/carb issues.

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virgilmobile
Posts: 7650
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: 86 GL1200A Carbs won't sync, won't idle down!

Postby virgilmobile » Tue Sep 16, 2014 6:52 am

Keep us posted.take pictures.

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alanc1100
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Motorcycle: 1986 GL1200A Aspencade

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby alanc1100 » Sat Nov 08, 2014 6:11 am

Sorry, I keep forgetting to take pictures! Well, the last 2&1/2 months was filled with tire changes complete with Dyna beads, rebuilding all three calipers, replaced rear pads, drained and bled them with fresh fluid, planning on replacing fluid in clutch line and bleeding either tomorrow or Monday. Had a lot of chrome rust to remove. It's coming along...had to reseal the muffler joints where they meet the headers. Got the new carb to plenum and intake manifold gaskets and installed the carbs. Cranked her up, she sync'd perfectly and after doing the idle drop procedure with the pilot screws, she purrs like a Tiger! Now I can get all the chrome and plastics reinstalled (painted it Burgandy) and get her ready for the first ride! Gotta go make her legal and I'll be riding!

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alanc1100
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Joined: Thu Aug 26, 2010 4:51 am
Location: Lakewood, Wa.
Motorcycle: 1986 GL1200A Aspencade

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby alanc1100 » Sat Nov 08, 2014 6:42 am

My boy!  Already a Saints fan!  Who Dat!
My boy! Already a Saints fan! Who Dat!


My grandson, Blake, was born a week ago Tuesday!



A real looker from 30 ft. Away!
A real looker from 30 ft. Away!


Okay, Here is a pic of my 86 Aspy just after getting her home. That was October 2010. I'll add more when she's all dressed up.

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HawkeyeGL1200
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Location: Courtland, Va.
Motorcycle: 1984 GL1200 Interstate
1981 GL1100 Interstate

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby HawkeyeGL1200 » Sat Nov 08, 2014 7:32 am

I am always interested in reading about projects when a person takes an old motorcycle and puts it back on the road again in the same basic configuration that it was built in. You will be rewarded by how the bike looks and runs.

Good job!
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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alanc1100
Posts: 71
Joined: Thu Aug 26, 2010 4:51 am
Location: Lakewood, Wa.
Motorcycle: 1986 GL1200A Aspencade

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby alanc1100 » Sat Nov 15, 2014 7:19 pm

Thank you Hawkeye. I feel the same way.

Okay, a couple posts up, the before pic. Now, the AFTER pics... At the moment I have no badging installed yet. I also have to finish cleaning up the chrome exhaust pieces, the trunk and saddle bag bars, the trunk luggage rack which are not installed yet either. The windshield outer garnish is looking rough. I need to strip the clear coat or what is left of it, Polish it to a chrome like shine and reclear it. So right now it is stock. I hope you all like that paint job. It cost me over a grand and that was a buddy doing the painting. All PPG. Forgot the code #, but it is a late Corvette Burgandy.
Alan
Attachments
Rollout
Rollout
Backside
Backside
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Right side
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Me, happy and almost ready for first ride!
Me, happy and almost ready for first ride!

PurpleGL1200
Posts: 16
Joined: Tue Jun 19, 2012 7:44 am
Location: St. Louis, Missouri
Motorcycle: 1978 GL1000
1983 GL1100A
1984 GL1200I
1985 GL1200I

Re: 86 GL1200A Carbs won't sync, won't idle down!

Postby PurpleGL1200 » Mon Nov 17, 2014 9:44 am

Very nice. Now for some black, gold, or silver pinstrip tape to accentuate the lines, and put the emblems back on. You'll be surprised how many complements you get on your 28 year old bike.

I painted my 85 Interstate Corvette gold with black pinstripes and people are surprised that it is almost 30 years old. Gold looks a lot better than the purple with silver accents it used to have (Ugh!)




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