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Bizarro problem

J

Jim R

Forum Apprentice
1982 GS1100G. 100% stock.
#2 cylinder not firing. Have good spark.
Took gas tank off.
Hooked up external gas reservoir and plugged vacuum line.
Started and runs perfectly.
Took the time to adjust air / fuel mixture and sync carbs while the tank was off.
Runs like new with external gas reservoir.
Put gas tank back on. Made sure everything connected correctly.
Start up. Cylinder #2 isn't firing again.
Tried running it on reserve as well as prime. #2 doesn't fire.

Anyone??
 
Sounds like your petcock is dumping fuel through the vacuum line into the #2 carb making it too rich.
 
Check the routing of the plug wire to #2. Might be shorting on the bottom of the tank.
 
Actually... I did remove the vacuum line while it was running to make sure there was vacuum. (There was) No fuel was coming out of the petcock.
 
Okay need some of the long time members to chime in on Jim R. I've been chatting with him on Facebook and not come to a solution to his problem yet.
 
Test thw petcock.
Put the petcock in the run position. Add a small piece of tubing to the petcock vacuum port and give a little suck on it. If gas starts flowing in a nice stream and then stops when you stop sucking on the tube then your petcock should be fine. If the gas just dribbles out or does not come out at all then you have a seriously blocked petcock.
Simple test to see if you are getting fuel. Doesn't sound like it.
 
That or despite your efforts cleaning the carbs, there is some blockage somewhere in the #2 carb.
Just a couple things that came to my mind.
 
Have you replaced the vacuum hose? It might have a split in it?

Or maybe a split / leak in the vacuum tap diaphragm?

It sounds like #2 is sucking air through the vacuum inlet rather than through the carbs and it can only be from the above.
 
There's lot's of vacuum through the vacuum line. I'm hoping it's just a clogged up petcock. Emptied the tank. Going to take the petcock off tomorrow.
 
Check fuel flow into a container from the tank. On prime it should flow about a quart in 30 seconds. Then attach a vacuum line and suck on it with the tap turned to reserve or run depending on how much fuel you have in it and the flow should be the same. Anything else will reveal a fuel tap problem. Hopefully the diaphragm is OK and you don't get a mouth full of gas, if you do you know where the problem is.
 
If its not running on #2 and the others ARE hot, then its getting fuel from the petcock. I think the carb float may be dragging on the bowl gasket and not letting it drop far enough to open fuel flow. That or there has been a piece of crud from the tank sucked into the float and jamming it up or clogged up the pilot jet again.
 
It still runs perfectly on the aux tank? If so the carbs must be fine, its got to be a petcock, fuel tank, or bad gas thing.
 
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