Carb Tuning Gas Supply

[crazyrnus]

1980 GS1000. Well, the carbs are rebuilt, all new rubbers and the air box sealed. I still can't get the bike to idle correctly, now I can't get it to run. This is with the gas tank installed. I ordered a carbtune and related supplies so I can sync the carbs but need to figure something out for a gas supply. If it will start and run with an external supply, just might be that wonderful fuel petcock, THINK! I know some guys simply move the tank out of the way, but that seems a little too risky for me. I would rather hear what others have done to get fuel to the carbs to tune them. I would like to get to ride it sometime this year!

As always, thanks for any help!!!!!!!!!

[Big T]

Go to a hardware type place (lowe's ,etc) or a lawnmower type shop and get a generic gas tank for a lawn mower with the same size gas line as yours.

Hang it from something, make it so you can take it down and refill it

[Detroit Diesel Man]

Go to a hardware type place (lowe's ,etc) or a lawnmower type shop and get a generic gas tank for a lawn mower with the same size gas line as yours.

Hang it from something, make it so you can take it down and refill it

+1 on the lawnmower tank...works great and beats the price of a 40.00 motion pro tank by 35.00.


DDM

[tkent02]

I use one of those aluminum fuel bottles for hikers, drilled a couple holes in the cap, brass tubes in the holes, one short, one long, then two hoses. Blow in the short one, fuel flows from the long one, runs as a siphon until the bottle is empty. Hang the bottle on the handlebar or from the ceiling. To stop the flow, set the bottle below the carburetors, I usually hang it on the footpeg.

[azr]

I took a plastic container (soap bottle I think) from my recycle bin, drilled a hole in the bottom just a bit smaller than a chunk of fuel line I had in the shop. Crammed the one end into the container (sealed perfectly, has never leaked) and in the other end I put a small piece of clear hosing that I had lying around (fits tight, never leaked). That way I leave the fuel line attached to the carbs and just hook my external tank line into it. Easy peasy. I even drilled a hole through the very top of the neck on the container and lopped a wire through it, hooks on great to a coat hanger. Doesn't have to be fancy just has to work. As for your bike not running, odd that it did then didn't. Did you do a bench synch on the carbs? if you're wondering about your petcock. Turn it to prime, if the petcock is malfunctioning setting it too prime should fix things (don't forget to turn it back to 'run' when the bike is turned off though) if it doesn't improve things then your petcock is fine. Maybe you sucked something into the jets after starting it for a bit. Or you adjusted things too much and she's way off. But it should still start, sort of. More info pls.

[crazyrnus]

Thanks for the ideas!! I don't know what happened and why I can't get it started, now. The carbs were bench synced and the only adjustment I made was to the idle. It would start and idle for a while and then start to die. Start it again and it would go to 5-6k and then I could get it to idle down but it would eventually die. The tank had been cleaned with Rusteco before reassembly so I know it was clean. I did notice I can blow a large volume of air through the petcock on prime but on run I can hardly get any air through it. Maybe that is normal, I don't know.

[tkent02]

No, ON should flow pretty good, if the vacuum is applied to the diaphragm.

How does it run on PRI?

It should be the same as ON.

[crazyrnus]

It won't start on either, now, but it would only start on pri and then I could turn it to run. The problem was, I just couldn't get it to idle at any speed, it just kept dieing.

[tkent02]

I took a plastic container (soap bottle I think) from my recycle bin, drilled a hole in the bottom just a bit smaller than a chunk of fuel line I had in the shop. Crammed the one end into the container (sealed perfectly, has never leaked) and in the other end I put a small piece of clear hosing that I had lying around (fits tight, never leaked). That way I leave the fuel line attached to the carbs and just hook my external tank line into it. Easy peasy. I even drilled a hole through the very top of the neck on the container and lopped a wire through it, hooks on great to a coat hanger. Doesn't have to be fancy just has to work.

It has to be safe, too.
Just think how far that liter of Gasoline will go towards burning your house down.
Pull a hose out, or drop the bottle, it could be over.

[pyro254750]

I had a problem similar to this which i thought was carb related, and turned out to be a combination of coils and spark plugs. The problem got worse until the bike wouldnt run at all. Ohmed out the coils per a service manual, found them out of spec, replaced them. Ran, but ran badly. Checked plugs and they were in bad shape, replaced them, bike ran better but had the wrong size jets (aftermarket exhaust), blah blah blah, you get the picture. Check your plugs and coils. Also, keep in mind, there are alot of small passages in those carbs. Sometimes it takes 2-3 times going through them to make them run correctly.

[azr]

It has to be safe, too.
Just think how far that liter of Gasoline will go towards burning your house down.
Pull a hose out, or drop the bottle, it could be over.

That's what the fire extinguisher is for., but all joking aside safety is always #1. As for the not starting, it's always worth checking you have enough fuel.....don't ask me how I know this one.

[ardbeglily]

brilliant

Brilliant idea on the lawnmower gas tank idea

[BassCliff]

Hi,

I went pretty low-tech with one of these...



...with a barb connector at the end of the hose...



...so I could plug it into the fuel line to the carbs. Notice the vacuum line plugged with a golf tee.





You can also go to the junkyard and pick up a wiper fluid tank from just about any old car.


Thank you for your indulgence,

BassCliff

[TooManyToys]

I usually put the bike near my workshop bench so I can put a line from the bike's petcock to the carb's fuel line with a connector like BassCliff has done. The just turn the petcock to prime.