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No fuel through carb, where do I start?

Rusty Studebaker

Rusty Studebaker

Forum Apprentice
Past Site Supporter
1982 GS1100GL. I recently rebuilt carbs and looks like I got something wrong. Number one cylinder not firing. I have spark, compression is 150. I pulled the number one spark plug, poured some go juice in the hole, replaced the plug, started the engine and number one fired. There is gas in the number one carb bowl. Mixture screw is a shade over 2.5 turns out. Petcock is new. All other cylinders fine. No obvious defects in intake boot, though I know that's not worth much. I'm thinking I need to pull the carbs to get a better look at number one, but not sure where to begin after that. Thanks in advance.
 
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I did it with the aid of youtube before I found this forum. Watching the Series right now so will return to this in the morning. Thanks for the link.
 
Remove the air box, run the rpm's up to 3000 and place your hand over # 1 carb intake to choke it. Might be something simple. This is a quick fix for a plugged pilot circuit I've used through out my time in the industry. This will also tell you if you have fuel moving through the carb as you will see/feel it...

Texas earned that championship...

edited for carb #... I forgot to space LOL
 
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unfocused said:
Remove the air box, run the rpm's up to 3000 and place your hand over [NODE="1"]Home[/NODE] carb intake to choke it. Might be something simple. This is a quick fix for a plugged pilot circuit I've used through out my time in the industry. This will also tell you if you have fuel moving through the carb as you will see/feel it...

Texas earned that championship...
Click to expand...

Thanks, I suspect that it's something simple. I probably put something back together wrong, and maybe this will help me figure out what it is. I'm reassembling the brakes later today after the caliper rebuild kits arrive in the mail, so this will give me something to do until they get here.

Yes, the Rangers certainly did earn the victory, just as surely as the Phillies were the architects of their own demise.
 
Rusty Studebaker said:
Thanks, I suspect that it's something simple. I probably put something back together wrong, and maybe this will help me figure out what it is. I'm reassembling the brakes later today after the caliper rebuild kits arrive in the mail, so this will give me something to do until they get here.

Yes, the Rangers certainly did earn the victory, just as surely as the Phillies were the architects of their own demise.
Click to expand...

Sorry but I edited my post for the carb #. I forgot to space... might make better sense..

One thing I noticed during my carb rebuilds... The float bowl gasket. The dark gray gaskets are thinner (blue circle) and don't protrude into the float pocket. I've had them either stick wide open or closed, hanging up on the gaskets. The float can move slightly from side to side. I made sure my floats were square and I always measure my float level on both sides.

bowl gasket.png
 
These are the ones I have problems with... The difference is minimal but enough to make life fun

bowl gasket 2.png​
 
unfocused said:
These are the ones I have problems with... The difference is minimal but enough to make life fun

​
Click to expand...

If I get no answer from taking off the airbox, maybe I should just pop off the carbs and open that one up.

I knew what you meant in your post because I had the same problem and had to go back and edit. Thanks again.
 
Rusty Studebaker said:
Thanks, I suspect that it's something simple. I probably put something back together wrong, and maybe this will help me figure out what it is. I'm reassembling the brakes later today after the caliper rebuild kits arrive in the mail, so this will give me something to do until they get here.
Click to expand...

Did you buy new brake lines? It's critical to do so, because the old rubber deteriorates, and crud builds up inside the lines.
 
Nessism said:
Did you buy new brake lines? It's critical to do so, because the old rubber deteriorates, and crud builds up inside the lines.
Click to expand...

Yeppers. Just finished putting everything back together. I used Spiegler braided steel lines. Ordered custom lengths (dumped the splitter) on Friday, they arrived Wednesday. I like Spieglers because you can turn the fitting to fine-tune the connection. The old lines were original and the calipers were well frozen. Too bad the exhaust is off, otherwise I'd take it around the neighborhood for a test ride.
 
unfocused said:
Remove the air box, run the rpm's up to 3000 and place your hand over # 1 carb intake to choke it. Might be something simple. This is a quick fix for a plugged pilot circuit I've used through out my time in the industry. This will also tell you if you have fuel moving through the carb as you will see/feel it...

Texas earned that championship...

edited for carb #... I forgot to space LOL
Click to expand...

As soon as I covered the intake, cylinder number one fired. Take my hand away, it goes out. I can't get too excited about riding with my hand over the intake, so I guess this means pull the carbs and clear the pilot circuit? I swapped out the jets when I did the carbs (making sure that the sizes were the same). Any guess on what the most likely way I screwed this up? I guess I should go ahead and pull the carbs.

Also: When I pulled the airbox, number one carb had gasoline around its intake.
 
Your pilot circuit is plugged. Make sure the pilot jet isn't plugged from the factory...
Float isn't stuck or fuel level to low - main would still be in fuel but pilot won't.
Make sure the slide is open when you move the idle screw. I found this out and I thought I'd posted a story about it years ago.
Fuel could be coming from the float bowl vent? Trying to suck air from somewhere if the slide is closed?
Most likely way - you left a q-tip in the pilot circuit :rolleyes:

There isn't a most likely way and it happens.
Left a PM.
 
That was my thought as well. I'd get the carbs back on the bench and make sure I saw flow through the pilot circuit (I take carb cleaner or WD40 spray some down into the pilot jet hole then toot some compressed air in while watching down the carb throat for good even flow through all of those tiny holes near the throttle blade
 
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