Pick your brains. Carbs??


Information and questions on GL1200 Goldwings (1984-1987)
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seasicksid
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Pick your brains. Carbs??

Postby seasicksid » Fri Nov 22, 2013 11:32 am



1984 Interstate. Stood for five years. New oil, plugs, filters and petrol. Carbs Seafoamed. Started up fine. Revs seemed fine but
it started to pop from exhaust. I noticed there was a shudder on idle. I disconnected each plug lead one by one and found all were sparking great but no change in the tone of the engine when I disconnected cylinder one. When I took the tops of the carbs off I noticed the diaphrams are in tact but very limp, as if they've been over stretched. Compression good, same as others. Petrol in float chamber, sparks excellent. Any ideas please?

Sid



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virgilmobile
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Re: Pick your brains. Carbs??

Postby virgilmobile » Fri Nov 22, 2013 1:20 pm

The diaphragm looks fine...as long as there are no tears or pin holes in them...
The slides really only come into play as the engine rpm increases...Somewhere above 1500 rpm..
If at a idle,you have one dead cylinder...confirm this..
From a cold engine,start it...don't rev the engine...keep it below 1000 rpm....Shut it down after 5-8 seconds and LIGHTLY tap on each exhaust header....Warm is normal...cold is a non firing cylinder...
One dead cylinder at a idle can be any one of 3 things...Spark..compression or a plugged idle jet/ports...
Process of elimination...test the compression....swap the plug...if there OK..then pull the carb...
Don't forget to bench test the carbs for fuel level shutoff and slide action(shop vac)...Inspect the linkage for wear in the bushings then mechanically pre-sync the carbs before you put them back on for the vacuum sync.

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virgilmobile
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83 GL1100 standard
84 GL 1200 I

Re: Pick your brains. Carbs??

Postby virgilmobile » Fri Nov 22, 2013 1:42 pm

I also noticed in one picture a lot of gunk around the diaphragm...Take special note...The carbs have plenty of small holes in and about them...They all serve a purpose..some are for air monitoring,some have fuel in them...Every port in the slow speed circuit is small and easily plugged by the debris I see here...The carbs really need to be spotless inside..

Here's a fellow that had problems too....There's plenty on this site about servicing the carbs...viewtopic.php?f=5&t=10147

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seasicksid
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Re: Pick your brains. Carbs??

Postby seasicksid » Fri Nov 22, 2013 3:40 pm

Great info Virgil. Thanks.
Definitely a dead cylinder at idle. Spark and compression good. Time for a rebuild.
:D

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virgilmobile
Posts: 7653
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
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78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Pick your brains. Carbs??

Postby virgilmobile » Fri Nov 22, 2013 5:41 pm

Plenty of help round here.Take pictures,don't mix the slides between carb body's.

RATWING-86
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Location: Deerfield, Virginia
Motorcycle: 1986 GL1200 ASPENCADE

Re: Pick your brains. Carbs??

Postby RATWING-86 » Sat Nov 23, 2013 6:37 am

Motorcycle carbs can be perplexing, I'm putting mine back on today. My '86 sat for 10 years, it runs and drives, and fires on all four BUT I get the annoying lean condition off idle and coasting and the dreaded popping in the exhaust on decel. I did re-remove the carbs, removed tamper plugs, backed out my mixture screws 2 turns, and replaced the slow air cutoff valve on the plenum. I also shimmed my needles 1mm, I will report back tomorrow if my saga has ended. I feel your pain, I've been down this road before on other Hondas, at least the GL 1200 carbs are easy to remove!
Motorcycles:
'81 Honda CBX 1050 (current and forever)
'03 Honda RC 51 1000 (current and forever)
'75 CB 750 K3 (for sale) good running bike
'86 Honda Gold Wing Aspencade, (the Ratwing)
too many more to list..................

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seasicksid
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Re: Pick your brains. Carbs??

Postby seasicksid » Sat Nov 23, 2013 9:14 am

That's great. Any advice appreciated. New ground to me. I've stripped two of the four and have them in soak. Lots of crud everywhere. The Cut off valve looks in pretty good shape.

Cherrs for now

Sid

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seasicksid
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Re: Pick your brains. Carbs??

Postby seasicksid » Sat Nov 23, 2013 9:21 am

Crud everywhere

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

Re: Pick your brains. Carbs??

Postby virgilmobile » Sat Nov 23, 2013 10:57 am

Verify every port is clear.Some use a old Water pick to pump water through each hole.

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seasicksid
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Re: Pick your brains. Carbs??

Postby seasicksid » Sun Nov 24, 2013 1:44 pm



The air/fuel ways I've removed the jets from are clear. Ran air through them. There are other passages that seen to be sealed off. The brass jet in the centre is fixed in place and appears blocked. The small tube on the outside of the carb is solid. There is another route through the carb that has a solid brass **** in it. Were these carbs adaptable for other uses?
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seasicksid
Posts: 38
Joined: Tue Oct 08, 2013 5:11 pm
Location: Essex, England, United Kingdom
Motorcycle: 1984 GL1200 Interstate
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Re: Pick your brains. Carbs??

Postby seasicksid » Sun Nov 24, 2013 1:48 pm

sorry about the pics. I meant to include three different images. Must have inhaled too many petrol fumes. I'll try again

RATWING-86
Posts: 23
Joined: Tue Oct 01, 2013 10:15 am
Location: Deerfield, Virginia
Motorcycle: 1986 GL1200 ASPENCADE

Re: Pick your brains. Carbs??

Postby RATWING-86 » Tue Nov 26, 2013 5:28 am

My Wing is finally running good, shimmed my needles 1mm and adjusted out my pilot screws 3.5 turns. I started them at two turns and backed them out 1/2 turn at a time until the engine just purred, it's amazing how nice it drives now, no more lean surge and it actually warms up and starts quicker.


Motorcycles:
'81 Honda CBX 1050 (current and forever)
'03 Honda RC 51 1000 (current and forever)
'75 CB 750 K3 (for sale) good running bike
'86 Honda Gold Wing Aspencade, (the Ratwing)
too many more to list..................


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