78 GL1000 carb question


Information and questions on GL1000 Goldwings (1975-1979)
  • Sponsored Links
curt_s
Posts: 7
Joined: Fri Jul 01, 2011 4:57 pm
Location: Mukwonago, WI
Motorcycle: sv1000s

78 GL1000 carb question

Postby curt_s » Wed Jul 06, 2011 1:55 pm



Hey guys,

Working on getting a 78 wing going that's been sitting for over 7 years. I've sonic cleaned and rebuilt the carbs and its running pretty decent but I'm getting a slow leak from the center of the carb rack when the bike is running. I do have it running off a axillary fuel bottle with fresh fuel so it shouldn't be any contaminates. Wondering if the rubber gasket that is between the rack when split could be the problem. Any input would be great as this is the first Goldwing I've taken on.

Thanks



User avatar
virgilmobile
Posts: 7654
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: 78 GL1000 carb question

Postby virgilmobile » Wed Jul 06, 2011 2:14 pm

Look down into the center of the plenum first to see if fuel is pooling there. I don't think that the plenum has fuel tubes in it.If I remember right each carb is fed externally with rubber lines.
if it's pooling fuel in the plenum box,one or more carbs are not shutting off the fuel by a sticking float or needle valve,etc.
Also remember that the fuel pressure should not exceed 2.5 psi.any more can overpower the needle sealing

curt_s
Posts: 7
Joined: Fri Jul 01, 2011 4:57 pm
Location: Mukwonago, WI
Motorcycle: sv1000s

Re: 78 GL1000 carb question

Postby curt_s » Thu Jul 07, 2011 9:43 am

I haven't seen any fuel building up in there. What else could cause fuel seeping from the center of the carb rack? I put in all new seats and jets inside, so I don't think that its over flowing the needles.

User avatar
virgilmobile
Posts: 7654
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: 78 GL1000 carb question

Postby virgilmobile » Thu Jul 07, 2011 10:16 am

I'll look at a pix and post it .See if your carbs are in fact gl1000 carbs .gl1100 carbs will fit.
The fuel is delivered to each carb through the plenum box,so a bad seal can cause weeping.
Attachments

User avatar
virgilmobile
Posts: 7654
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: 78 GL1000 carb question

Postby virgilmobile » Thu Jul 07, 2011 10:51 am

Wait a minute,could this be as simple as a leaking fuel line and dribbling down the outside of the plenum and dripping off the bottom???
Did you replace the 30 year old rubber hoses and use new clamps?

curt_s
Posts: 7
Joined: Fri Jul 01, 2011 4:57 pm
Location: Mukwonago, WI
Motorcycle: sv1000s

Re: 78 GL1000 carb question

Postby curt_s » Thu Jul 07, 2011 11:04 am

That picture looks like the ones I've got on the bike. The hoses go from the carbs to the box. I don't think the carbs have ever been switched. The bike has low 30k miles and has had the same owner for over 10 years, and nothing was done before he got it and I know he never did anything to it.

User avatar
virgilmobile
Posts: 7654
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: 78 GL1000 carb question

Postby virgilmobile » Thu Jul 07, 2011 11:53 am

Get a good look when it's leaking.I'll bet one of the fuel lines are leaking at the plenum box.

curt_s
Posts: 7
Joined: Fri Jul 01, 2011 4:57 pm
Location: Mukwonago, WI
Motorcycle: sv1000s

Re: 78 GL1000 carb question

Postby curt_s » Thu Jul 07, 2011 12:48 pm

Checked the plenum box before I fired it up today, it was dry. Fired up the bike and checked around the fuel inlet tubes on the outside of the box, didn't see any leaks coming from them. The rubber hoses were surprisingly pliable and didn't have cracks when I rebuilt the carbs, so I hadn't replaced them yet. As the bike was running it was still having fuel run down where the rack splits in half and the plenum box was damp from moisture, but no pools of fuel, but it wasn't running all that long.

TheArtist
Posts: 70
Joined: Fri Apr 08, 2011 1:13 pm
Location: dell rapids
Motorcycle: 1979 GL 1000

Re: 78 GL1000 carb question

Postby TheArtist » Thu Jul 07, 2011 3:30 pm

When I first started the bike I bought, there was alot of fuel in the plenum. The floats were stuck, maybe you have a sticky float?? I cleaned the float hindge with a torch tip cleaner, the rod I put in the drill and buffed it smooth.

curt_s
Posts: 7
Joined: Fri Jul 01, 2011 4:57 pm
Location: Mukwonago, WI
Motorcycle: sv1000s

Re: 78 GL1000 carb question

Postby curt_s » Thu Jul 07, 2011 3:38 pm

I put in brand new floats, float pins, needles, seats, and jets. I cleaned out the pin pivot areas in the posts and everything moved freely before I installed the bowls.

User avatar
virgilmobile
Posts: 7654
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: 78 GL1000 carb question

Postby virgilmobile » Thu Jul 07, 2011 3:53 pm

Well the only thing left is the gasket between the plenum halves leaking.

curt_s
Posts: 7
Joined: Fri Jul 01, 2011 4:57 pm
Location: Mukwonago, WI
Motorcycle: sv1000s

Re: 78 GL1000 carb question

Postby curt_s » Thu Jul 07, 2011 5:08 pm

Guess I'll have to get one on order. Should've just done it the first time and saved this trouble. Go figure a 30 year old gasket would leak :roll:

jackknife
Posts: 8
Joined: Mon Aug 17, 2009 9:02 pm
Location: Phoenix, AZ
Motorcycle: 1979 GL1000

Re: 78 GL1000 carb question

Postby jackknife » Thu Jul 07, 2011 5:36 pm

I just want to add something. Those hoses do NOT carry fuel. They are air lines. The fuel is carried to each carburetor by internal channels in the plenum.

icemonster
Posts: 7
Joined: Sun May 15, 2011 3:41 am
Location: Gent, Belgium
Motorcycle: 1980 GL1000 goldwing

Re: 78 GL1000 carb question

Postby icemonster » Wed Jul 13, 2011 5:09 am

when you was cleaning the carbs, did you set the floats correctly? if one is of line, the fuel can get in to the plenum. Yes the outher tubes are vacuum tubes in coörporation whit the main air shut of valve. if the are leaking the iddle will be way of line en you also get backfires.

it is not enough to clean the carbs by ultrasoon, you have to clean them manual to. also use dry air or N² to clean the small passages. are the alu pucks free en remouveble, and so on. did you inspect the main fuell inlet?

Ice

curt_s
Posts: 7
Joined: Fri Jul 01, 2011 4:57 pm
Location: Mukwonago, WI
Motorcycle: sv1000s

Re: 78 GL1000 carb question

Postby curt_s » Wed Jul 13, 2011 10:23 am

Yea, I did blow air and spray cleaner through everything after the sonic clean. All the pucks were free and cleaned. All the floats were set, but I will double check when the new gasket comes in and I pull them back out.

User avatar
virgilmobile
Posts: 7654
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: 78 GL1000 carb question

Postby virgilmobile » Wed Jul 13, 2011 4:11 pm

jackknife wrote:I just want to add something. Those hoses do NOT carry fuel. They are air lines. The fuel is carried to each carburetor by internal channels in the plenum.


Thanks for refreshing my memory.It's been 15 years sense I worked on a 1000 carb pack and I've slept sense then.I think. :?:
I knew the gas got there somehow and it's leaking,so it must be a bad seal somewhere.How much more vague can I get? :lol:

User avatar
TheRobbie1950
Posts: 48
Joined: Sat Jul 09, 2011 6:33 pm
Location: Saskatoon, Saskatchewan, Canada
Motorcycle: 1978 GL1000 Goldwing

Re: 78 GL1000 carb question

Postby TheRobbie1950 » Thu Jul 14, 2011 1:54 am

My 1978 gl1000 will not even start now. I added plugwires to the coils which seem to be giving me spark. I changed the points , because they looked fried to me . The bike still won't start. I have noticed that the plenum should not be full of gas from the posts here. My plenum fills with what I think is too much gas.
If I have one cylinder not firing properly, will this cause plenum fuel build up? OR is it completely a carb thing?

icemonster
Posts: 7
Joined: Sun May 15, 2011 3:41 am
Location: Gent, Belgium
Motorcycle: 1980 GL1000 goldwing

Re: 78 GL1000 carb question

Postby icemonster » Thu Jul 14, 2011 2:58 am

First you have to figger out why the plenum is filling with gas. You also have to be 100% sure you dind't do anything wrong wile cleaning the carbs. You dind't mixed things around in there? the master air cut off valve is correctly mounted and so on. You didn't switched the air jets (60 vs 120)? the float needle is closing when the bowl is full ? make a good resumé of what you did and didn't do. maybe you find what you did wrong.

Ice

User avatar
TheRobbie1950
Posts: 48
Joined: Sat Jul 09, 2011 6:33 pm
Location: Saskatoon, Saskatchewan, Canada
Motorcycle: 1978 GL1000 Goldwing

Re: 78 GL1000 carb question

Postby TheRobbie1950 » Fri Jul 15, 2011 11:33 am

Thank you Ice for your reply.




Return to “GL1000 Information & Questions”




Who is online

Users browsing this forum: No registered users and 1 guest