carbs


Information and questions on GL1000 Goldwings (1975-1979)
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mattjohnson207
Posts: 10
Joined: Tue Sep 20, 2011 6:15 pm
Location: glendale,az
Motorcycle: 1978 gl 1000 goldwing

carbs

Postby mattjohnson207 » Sun May 27, 2012 12:37 pm



Made the mistake of allowing someone to show me how to clean my carbs. My friend mixed up the caps and pistons. I have Randakks video on carb rebuilding. He doesn't say anything about this problem. I am not looking for peak performance, just decent gas milage, and probably run no faster than 75 mph.
I have another set of carbs, lost a spring from the cap and pistons, found one almost the same in a salvage yard. Can this or the other set run well given their resp
ective problems? Shouldn't a syncronization compensate for these problems?

Its a 1978 GL 1000 with 26k miles. thanks, matt in Glendale



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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: carbs

Postby virgilmobile » Sun May 27, 2012 3:25 pm

[quote="mattjohnson207"] , found one almost the same in a salvage yard. Can this or the other set run well.

Here's the secret
The springs need to be the same.
Polish the slides and caps.Now that things are mixed up,you may need to 1000 grit any areas that drag the slide in the cap.
The slide MUST move from top to bottom butter smooth...no exception.
After all the slides and caps have been put back on,use a shop vacuum on each tube.This simulated the engine.As you open the throttle,you can look at each slide to see it operate and if there even.
You will need to sync the carbs and a pre-adjustment is a good ides.

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dingdong
Posts: 2863
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: carbs

Postby dingdong » Mon May 28, 2012 6:38 am

I would venture to guess that many if not most caps and pistons have been mixed and matched at sometime in the past. Before Randakk who knew about the "necessity" to keep them together. When I rebuilt my 76 I didn't know this and I have a very smooth running bike. In the 80s Honda did a recall on the gl1100 for a stiction problem with the pistons. They only replaced the pistons, not both, with Teflon coated pistons. I can understand the reasoning for keeping them together but only because they have "worn" together. As Virgil recommended, a good polishing will put them in proper working order.There is no reason to panic or replace the carbs. MHO
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

mattjohnson207
Posts: 10
Joined: Tue Sep 20, 2011 6:15 pm
Location: glendale,az
Motorcycle: 1978 gl 1000 goldwing

Re: carbs

Postby mattjohnson207 » Mon May 28, 2012 6:09 pm

Thanks guys, now I can sleep nights and anticipate that first weekend trip...had it in the garage for four years now, just finished cleaned up the valves, replaced timming belts...so close! Matt

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JellyBelly
Posts: 181
Joined: Mon Apr 23, 2012 8:39 am
Location: Southaven, MS
Motorcycle: 2000 Valkyrie GL1500
1978 GL1000 cafe racer (sold)
1977 GL1000 (sold)
1976 GL1000 (parting out)
1985 KZ550 (sold)
2006 CFMoto V5 (sold)
Contact:

Re: carbs

Postby JellyBelly » Wed May 30, 2012 10:29 am

BTW virgilmobile...I love the updated profile pic...lol!!!
I love my wings (both Hot and Gold) - check out my blog @ http://wingthing1000.blogspot.com/

Former 76, 77, and 78 GL1000 owner...Upgraded to a Chromed out Valkyrie

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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: carbs

Postby virgilmobile » Wed May 30, 2012 1:14 pm

Like the Admin,and the comment about his avatar,I also don't have a updated picture.
This was the next best thing.At least my wing isn't lonely with the 1200 keeping it company. :)

About the carbs....It is really convenient to vacuum cleaner each carb to VERIFY each slide is working before it goes back on the bike.
I go as far as to fill the carbs on the bench and then drain each one to measure the fuel level.I'm looking for the same amount in each carb.An uneven amount of fuel will upset the fuel mixture for that cylinder.
Even after careful assembly,I had one sticking.I rotated the cap 180* and re-tested.
They must move with air flow.Just one sticking and the engine runs like pu-pu.
You get the carbs to a nats ass and the bike will just amaze you on how fast it will go through the gears.

Balance is important.Remember it is designed as one carb per cylinder,so equality is necessary.
A very good sync dramatically improves "off idle" rattle and acceleration.
Check this post for how I do all my bikes...viewtopic.php?t=8994&p=40711

colemadad
Posts: 92
Joined: Tue Dec 08, 2009 7:07 pm
Location: Moncton, NB
Motorcycle: 1983 GL1100I Interstate

Re: carbs

Postby colemadad » Fri Jun 01, 2012 7:32 pm

Virgil - can you provide a bit more detail on the shop vac procedure. Can it be done with the carbs on the bike. And when you talk about cap and slide; you're referening to the cap on the top of the carb and the "piston" that has the spring and needle jet in the top of it? Number 8, if you happen to be looking at the schema on Bike Bandit for a 1983 GL1100I. Obviously the sand paper would be on the inside of the cap but what about the piston, do you mean that wider section at the top that could potentially contact the inside of the cap?

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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: carbs

Postby virgilmobile » Fri Jun 01, 2012 11:40 pm

The carbs really don't have to come off the bike for the vac test....but it is so much easier.especially if you have to work on them.
First the "caps"..Yes the dome that's on the top of the carb.and the "slide"or piston.I also have used 1000 grit paper to surface them and Mothers Aluminum polish before I finish.
The pistons must slide full stroke into each cap without the slightest hint of sticking,It should just bottom out.Also never use any oil for assembly.Clean the bore(brass slide bushing) in the cap too.
As for the shop vacuum idea..
After I assemble the carbs and pre-set all the throttle valves closed.
I just hold the hose to the end of the carb,(the end that goes to the engine),Operate the throttle and look down,inside at the slide.As the throttle is opened,the slide will magically rise into the cap.
I check each carb,one at a time....It's really cool to actually watch it work and easy to identify if one is sticking or is nor rising like the others.

On the last 1100 carb I spit polished,one slide kept sticking....I knew it wasn't the piston as it was flawless on the bench..so I removed the 2 screws and turned the cap 180*.It worked perfect.
Have a look at this post..viewtopic.php?f=4&t=8928
and this one too..http://www.goldwingdocs.com/forum/viewt ... 94&p=40711




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