GL1100 carburetor rebuild


Information and questions on GL1100 Goldwings (1980-1983)
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Bill P.
Posts: 19
Joined: Thu Aug 16, 2018 5:58 pm
Location: Bluffton, SC & Wall, NJ
Motorcycle: 1980 GL1100 Interstate
1976 Suzuki GT550

GL1100 carburetor rebuild

Post by Bill P. »



I just rebuilt the carburetors on my 1980 GL1100 using Randakk's Master Carb Overhaul Kit and Repair Guide. All went well until I got to where they tell you to pre-fill the carbs. I felt the change in resistance, so I'm confident that the bowls are full. There were no leaks, but after operating the throttle drum for several minutes I never got any fuel out of the accelerator jets. I took the accelerator pump apart. There is gas in it and all the gaskets and O rings appear to be in their proper places.

How long does it take for fuel to move from the pump to the nozzles? I noticed that the pump rod moves only a little bit (about 1/8 inch). Is this normal?

Any guidance you can give me will be greatly appreciated. Bill P.


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OldguyGlen
Posts: 225
Joined: Sat Nov 24, 2018 10:55 am
Location: Mound,MN
Motorcycle: 1980 GL1100 STD/Vetters
1966 Honda 90

Re: GL1100 carburetor rebuild

Post by OldguyGlen »

Should take only a few "squirts" to get accel pump gas into the #3 carb. A few more to fill the lengthy passages to the other carbs. Problem is probably clogged passages or valves. There are 2 check valves (inflow & outflow) in the #3 carb accel pump that easily clog on long dormant carbs. But there are also discharge ports (one in each carb throat) that are very small and take patience to clean. Test everything with solvent squirts and/or air pressure to verify flow before reassembly.
Bill P.
Posts: 19
Joined: Thu Aug 16, 2018 5:58 pm
Location: Bluffton, SC & Wall, NJ
Motorcycle: 1980 GL1100 Interstate
1976 Suzuki GT550

Re: GL1100 carburetor rebuild

Post by Bill P. »

I found a youtube video (youtube.com/watch?v=kPIiGp6l20I) that shows how to test the accelerator pump, and determined that mine is not pumping. It sucks gas into the pump then pushes it back into the float bowl instead of out the discharge port. I suspect that it has something to do with the fact that when I was cleaning the pump cap with compressed air I blew that little square piece of brass (I assume that's the check valve) out of its port. Luckily I was able to find it after about 5 minutes of crawling around on the floor and put it back in. But, now I wonder if there is more to the check valve, like maybe a spring and ball or something like that, that I didn't find. I tried to blow the other valve out to see what's inside it, but neither of them will come out with 90 psi air.

They say when you find yourself in a hole the first thing you should do is STOP DIGGING! So I'm going to go for a walk and think about some more.
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Overdog
Posts: 318
Joined: Sat Oct 12, 2013 7:00 am
Location: Pittsburgh, Pennsylvania
Motorcycle: 83 Goldwing Interstate

Re: GL1100 carburetor rebuild

Post by Overdog »

I'm pretty sure there IS a spring and ball in that valve....rather, WAS in that valve
Bill P.
Posts: 19
Joined: Thu Aug 16, 2018 5:58 pm
Location: Bluffton, SC & Wall, NJ
Motorcycle: 1980 GL1100 Interstate
1976 Suzuki GT550

Re: GL1100 carburetor rebuild

Post by Bill P. »

After crawling around on the floor some more I found the ball. Still looking for the spring. What's the trick to getting the check valve out of the pump body?
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DenverWinger
Posts: 1934
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: GL1100 carburetor rebuild

Post by DenverWinger »

The spring and ball and little brass piece that holds them in IS the one-way valve, nothing more to remove. Might see if you can get a swab in to clean where the ball seats, it's the spring-loaded ball that prevents back-flow into the carb bowl.

Might double-check the Randakk guide to see if there isn't another check valve in the discharge side, too.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark
Bill P.
Posts: 19
Joined: Thu Aug 16, 2018 5:58 pm
Location: Bluffton, SC & Wall, NJ
Motorcycle: 1980 GL1100 Interstate
1976 Suzuki GT550

Re: GL1100 carburetor rebuild

Post by Bill P. »

The problem is: I put the brass plug back in without realizing what it was and now I can't get it back out to put the ball in. Also, are we sure there's a spring in there?
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Overdog
Posts: 318
Joined: Sat Oct 12, 2013 7:00 am
Location: Pittsburgh, Pennsylvania
Motorcycle: 83 Goldwing Interstate

Re: GL1100 carburetor rebuild

Post by Overdog »

Air pressure won't work now like it did the first time?
Bill P.
Posts: 19
Joined: Thu Aug 16, 2018 5:58 pm
Location: Bluffton, SC & Wall, NJ
Motorcycle: 1980 GL1100 Interstate
1976 Suzuki GT550

Re: GL1100 carburetor rebuild

Post by Bill P. »

I found the spring!!! Now all I have to do is figure out how to get the plug out. The coefficient of thermal expansion is greater for aluminum than for brass, so I'm going to try boiling it. Fingers crossed!
Bill P.
Posts: 19
Joined: Thu Aug 16, 2018 5:58 pm
Location: Bluffton, SC & Wall, NJ
Motorcycle: 1980 GL1100 Interstate
1976 Suzuki GT550

Re: GL1100 carburetor rebuild

Post by Bill P. »

Success! The brass plug is out. Boiling didn't work so I got the propane torch out, heated it up, hit with air, and out it came. Now I can get back to work.
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OldguyGlen
Posts: 225
Joined: Sat Nov 24, 2018 10:55 am
Location: Mound,MN
Motorcycle: 1980 GL1100 STD/Vetters
1966 Honda 90

Re: GL1100 carburetor rebuild

Post by OldguyGlen »

Congratulations on the progress. There is a discharge valve of similar construction. Try to clean that on in place with solvent and air (not too much air.) You were able to heat the body to extract the intake valve, but locally heating the pot metal cast carb body with propane torch is a risky process. Too much local heat and they will crack. Obviously you were cautious and I'm glad it worked for you the last time, but as a warning to others, don't overdo localized heating. The alternatives are drilling, and/or sheetmetal screw methods but they can leave the brass damaged, needing more replacement parts, or locating used carbs on-line.
Bill P.
Posts: 19
Joined: Thu Aug 16, 2018 5:58 pm
Location: Bluffton, SC & Wall, NJ
Motorcycle: 1980 GL1100 Interstate
1976 Suzuki GT550

Re: GL1100 carburetor rebuild

Post by Bill P. »

OK, the carb rack is back on the bike and I'm getting close to trying to start it. So I'm going to need the synchronizing gauge setup. Any ideas where I can beg, borrow or rent one (I'm in South Carolina)? Failing that, where's the best place to buy one?
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Overdog
Posts: 318
Joined: Sat Oct 12, 2013 7:00 am
Location: Pittsburgh, Pennsylvania
Motorcycle: 83 Goldwing Interstate

Re: GL1100 carburetor rebuild

Post by Overdog »

I've been doing mine with a single vacuum gauge I got at Auto Zone...I know it's not the best way but it works. You need the 5mm nipples and I needed to get a check valve at the aquarium store.


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