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GS650G Carb Issues

abaton6 said:
I'm having a no fuel flow issue with MY 82 650 as well. It has a new petcock,...Ebay and a transparent fuel line with a plastic fuel filter. Wondering is the filter is too large a space to allow the vacuum to work.
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I pulled the tank off, and the petcock is dripping about 3 drips per second, while set at 12 o'clock.
Click to expand...

some of the ebay petcocks have weak springs on the diaphragm and the higher(it's merely "fuel-column" gravity) fuel pressure from a full fuel tank cause them to allow fuel past when the lack of vacuum pressure should shut them off.

Reduce fuel level in the tank to half-full or less in the fuel tank to test this. You may be able to use the spring from your original petcock to fix this. Other faults may include poor fit of the oring on the vacuum diaphragm's "plunger"
 
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I removed the carbs again,....3D time, removed the carb bowls and stuck a wire in all 4 brass tubes. They seemed fine. I removed the pilot jets to double check them. They have tiny holes on the sides, that I cleaned before, but I did not clean the hole at the bottom, ..didn't know about that one. I THINK they were clogged. I stuck a wire in those, and they are now soaking in carb cleaner. Another thing I noticed,...the choke slide,..on one carb, there is a deteriorated rubber seal. I was wondering if that would be causing any problems. The saga continues. choke.jpg
 
abaton6 said:
I removed the carbs again,....3D time, removed the carb bowls and stuck a wire in all 4 brass tubes. They seemed fine. I removed the pilot jets to double check them. They have tiny holes on the sides, that I cleaned before, but I did not clean the hole at the bottom, ..didn't know about that one. I THINK they were clogged. I stuck a wire in those, and they are now soaking in carb cleaner. Another thing I noticed,...the choke slide,..on one carb, there is a deteriorated rubber seal. I was wondering if that would be causing any problems. The saga continues. View attachment 60809
Click to expand...

It's always best to start your own thread on these matters instead of posting within someone else's thread. That said, did you do a full carb rebuild using the tutorial linked in my signature? No shortcuts?
 
I read your rebuild tutorial. Very thorough, but my carbs are a bit different. At the end it says the bike will run poorly, or not at all without the airbox installed. I had the airbox installed, but no air filter or filter cover. Would this affect anything? Thanks.
 
I read the top 10, and I've made many. I've had bikes for 52 years now, and I have never had any trouble with a carb. Never touched one. But this thing is quite vexing. I had a Norton 850 Commando that was constantly giving me grief, but never the Amal. P.S. that video link IS on bikecliffs,...that's where I found it.
 
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abaton6 said:
I removed the carbs again,....3D time, removed the carb bowls and stuck a wire in all 4 brass tubes. They seemed fine.....
Click to expand...

You also need to make sure that the channel in the float bowls feeding those brass tubes for the enrichener ("choke") circuit is open.

UGqkdQx.jpg
 
abaton6 said:
....At the end it says the bike will run poorly, or not at all without the airbox installed. I had the airbox installed, but no air filter or filter cover. Would this affect anything? Thanks.
Click to expand...
The bike will start up and idle normally without filter element in.....it will start to rev up, but fall on its face soon. The CV carbs rely on slide lifting to add air and fuel ....without the air box sealed up, the slides won?t lift properly.
 
I tried one last thing. I put the airbox cover on, and connected the hose from the top of the airbox to the valve cover. I started! It's not running great, but it is progress.
 
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tom203 said:
The bike will start up and idle normally without filter element in.....it will start to rev up, but fall on its face soon. The CV carbs rely on slide lifting to add air and fuel ....without the air box sealed up, the slides won’t lift properly.
Click to expand...

My old GS1000 would not idle normally without the filter or lid. The idle was higher.
 
It runs , but not well. I started it this morning, just for less than a minute. Felt the exh pipes. # 4 is COLD. #4 has compression, and a good hot spark. That leaves FUEL. Any advice on what to look for here?
 
abaton6 said:
It runs , but not well. I started it this morning, just for less than a minute. Felt the exh pipes. # 4 is COLD. #4 has compression, and a good hot spark. That leaves FUEL. Any advice on what to look for here?
Click to expand...
Let it run longer... I?m pretty sure mine doesn?t run on all four for about 30 seconds.....but after a minute or so ,all pipes are gettin toasty. If no improvement after 3 minutes, suspect that your #4 idle circuit is likely blocked. Can you ride this on road and find some long downhills? Going down a downhill and opening/ closing throttle puts a lot of vacuum on the idle circuits - you might get lucky
 
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