Carburetor Rebuild


Information and questions on GL1100 Goldwings (1980-1983)
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aznyaz
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Carburetor Rebuild

Postby aznyaz » Thu Mar 14, 2013 10:16 am



Has anyone out there done a carbuetor rebuild, and more specifically, a single carb rebuild? I've had a low to mid throttle sputter happening since I bought my bike and I've narrrowed it down to the #2 carb and I was wondering if I could save some money by doing just a partial assembly rebuild.



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trashtruck
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Re: Carburetor Rebuild

Postby trashtruck » Thu Mar 14, 2013 11:14 am

i know money is tight right now but to get to #2, ya gotta pull the whole setup anyway and your right there. do it right the first time i was always told
WHAT IS THE SPEED OF DARK?

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aznyaz
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Re: Carburetor Rebuild

Postby aznyaz » Thu Mar 14, 2013 11:34 am

Point taken, just wonderin'.

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BigDee
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1981 GL1100i Interstate

Re: Carburetor Rebuild

Postby BigDee » Thu Mar 14, 2013 3:12 pm

I agree with trashtruck. Once you have them off why waste the chance? But just for curiosity how did you narrow it down to #2?
He who throws dirt loses ground!

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SteveB123
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Re: Carburetor Rebuild

Postby SteveB123 » Thu Mar 14, 2013 5:19 pm

aznyaz wrote:I was wondering if I could save some money by doing just a partial assembly rebuild.


Yes, the less you do, the less it will cost.

Seriously, do you believe the other three carbs are in perfect order after 32 years of service?
Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing

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aznyaz
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Re: Carburetor Rebuild

Postby aznyaz » Thu Mar 14, 2013 10:43 pm

All good points. The way I determined that it was #2, I was looking at a photo taken of my wife and I on the bike and all of the exhaust pipes were clearly visible. Now, they're not OEM pipes and according to the guy I bought the bike from, they had blue discoloration because of the thin metal they are made of. This seemed like a logical explanation, so getting back to the photo of us on the bike I noticed that the #2 pipe was not discolored like the other three, and I started to think that the sputtering and low to mid throttle performance was because one of the carbs was not flowing fuel properly. I further verified my theory by checking for spark with the bike idling. I pulled each spark plug wire off individually and the engine would stumble and almost stall when I pulled #'s 1, 3 and 4 wires off their respective plugs but when I pulled #2 off the engine would just run as it always does. I further checked for spark at the #2 plug by holding the wire close to the head and the plug and I could see the spark arcing across. This reinforced my theory that I was not getting fuel to the carb at idle. I then checked for at change in the engine's performance at about 2,000, 3,000 and 4,000 rpm. At 2,000 rpm there was no change when I pulled #2 wire off the plug, but at 3,000 and 4,000 rpm the engine would stumble. This told me that there was fuel flowing with the throttle open and at higher rpm than at lower, and I think this goes along with the possibility of the idle and low speed jets being blocked. This latter thought is purely speculation on my part since I'm not that knowledgable on these carbs, but I heard something mentioned once about idle and low speed jets in them. As for the other carbs, I wouldn't say they're perfect either but based on my observations, they seem to be working better than #2. I appreciate your information and talk on this subject and would like to hear more of what you all have to say about my theories. Thanks. MJ

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aznyaz
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Re: Carburetor Rebuild

Postby aznyaz » Thu Mar 14, 2013 10:57 pm

...Additionally, when I ride I can feel the difference in the bike's performance between partially open throttle and more wide open. It's easy to tell when all 4 carbs are flowing.

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RBGERSON
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Re: Carburetor Rebuild

Postby RBGERSON » Fri Mar 15, 2013 8:25 am

FYI blue pipes usually mean the cylinders are running too hot...lean at some point and burned/blued the pipes..
It does sound like a clogged low speed jet..
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

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RB

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aznyaz
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Re: Carburetor Rebuild

Postby aznyaz » Fri Mar 15, 2013 8:55 am

How can I determine that for sure? If my cylinders are running hot wouldn't that be heating up the coolant and show up as higher temperature readings?

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aznyaz
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Re: Carburetor Rebuild

Postby aznyaz » Fri Mar 15, 2013 11:09 am

...I just remembered that my plugs are showing normal wear except for #2 which shows a little bit of fouling.

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trashtruck
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Re: Carburetor Rebuild

Postby trashtruck » Fri Mar 15, 2013 1:13 pm

not trying to hijack your thread just wanted to say that i started to pull mine apart and can't get #4 cause the po buggered up the screws for the cap and the drain. good luck with yours.
WHAT IS THE SPEED OF DARK?

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aznyaz
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Re: Carburetor Rebuild

Postby aznyaz » Fri Mar 15, 2013 1:51 pm

No problem, I want to hear it all! Gives me something possibly to be prepared for. I know it will require taking the whole carb assembly off, but what I was hoping for was may be just taking #2 apart to be able to clean the jets, etc. and slap it back together. Looking for all opinions on this matter.

Thanks.

MJ

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SteveB123
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Re: Carburetor Rebuild

Postby SteveB123 » Fri Mar 15, 2013 2:03 pm

If you're going to the trouble of taking them off, spend the time and go through them. Virtually all of the work involved is just cleaning.
I found the fluid passages on mine to be in pretty good shape, but the air and vacuum passages were certainly not. Cut off valves and vacuum sliders where filthy, and not moving smoothly....an easy fix once off the bike.
Even if you just remove and clean the jets, and sliders, and set the float levels, that would be a big step in the right direction, and can be done without separating the carbs apart.
Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing

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aznyaz
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Re: Carburetor Rebuild

Postby aznyaz » Fri Mar 15, 2013 2:22 pm

Thanks SteveB, excellent information!

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trashtruck
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Re: Carburetor Rebuild

Postby trashtruck » Fri Mar 15, 2013 4:03 pm

i think the worst part of the whole project is reattaching the cables
WHAT IS THE SPEED OF DARK?

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SteveB123
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Re: Carburetor Rebuild

Postby SteveB123 » Fri Mar 15, 2013 4:18 pm

trashtruck wrote:i think the worst part of the whole project is reattaching the cables


As a fool who did this last weekend, I heartily concur.


Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing


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