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Cylinder 3 still not working?

  • Thread starter Thread starter robgusto
  • Start date Start date
Yes the header was clear last time I had them off aprox 6 months ago. Also the gas that is not combusting comes out the pipe.
 
Before buying a new motor put a Dyna S and Dyna green coils on the bike and ride it.
What is the actual compression on #3?
 
Check that your choke, or more correctly, your enricher circuit is shutting off all the way and not allowing fuel to by pass.
 
I purchased a replacement coil for 2 and 3 and put on the bike today. We were thinking that it could be a resistance thing however cyl. 3 still not running. I'm pretty sure that it's not a coil probem. The compression on #3 is the same as the rest of the cylinders at 120.
The choke is working properly as far as I can tell. I may pull the carbs off again and switch the needle and choke assembly and start eliminating carb parts as the problem.
 
update on the evil bike

update on the evil bike

Just thought I'd update progress on my repairs!! The motor has been taken down to the head and I just got the gasket to replace. I was also thinking (because this issue is rediculous!!! and still stumping everyone I talk to) that if it doesn't work I will replace the motor. I hate to not figure this issue out but if you look at the beginning of this thread I have not been riding for a LONG TIME!!! Sorry it's been awhile but I've been waiting on parts and trying to have a bunch of people take a look at the bike and it continues to stump EVERYONE!!!!
 
I have at least another couple months of effort left. Then it's parts time!!
 
Sounds like the internal passages in the carb are still buggered up. If you spray carb cleaner into the air pilot jet (use the little spray straw and stick it in deep) does it come out the 3 little passages under the butterfly? Check the volume that comes out against one of the other working carbs. If it only trickles out or does not come out at all you will need to soak the carbs again.

-Dave
 
All carb passages were clear and we have been through them/soaked and they were checked again when rejetted. However because I have been through the carbs many times and still have not figured out I may just start over with a new one. I have been looking on Ebay but can only find a set of 4. I'm not going to build my own from carb body because it could be a screwy part. The carb was injecting gas however the bike would not backfire? I figured I would see at least a little fire out of the pipe. There was gas leaking out of the pipe? We did make sure that the bowl was not overflowing but even if it was I would expect the occational backfire?
 
robgusto said:
All carb passages were clear and we have been through them/soaked and they were checked again when rejetted. However because I have been through the carbs many times and still have not figured out I may just start over with a new one. I have been looking on Ebay but can only find a set of 4. I'm not going to build my own from carb body because it could be a screwy part. The carb was injecting gas however the bike would not backfire? I figured I would see at least a little fire out of the pipe. There was gas leaking out of the pipe? We did make sure that the bowl was not overflowing but even if it was I would expect the occational backfire?
Click to expand...


Post in the wanted parts forums here. There are many guys with lot's of spare parts.

-Dave
 
GS1000 #3 cylinder Wet/Not firing

GS1000 #3 cylinder Wet/Not firing

I know this is a late post. But maybe it will help those searching the archives.
If the#3 cylinder is not firing, no spark, Wet plug, Heavy smell of gas at the tail pipe.
CHECK THIS NEXT. THE PETCOCK DIAPHRAM!
The fuel valve/petcock is operated by vacuum connected to the #3 intake. The diaphram has failed and raw fuel is being drawn straight to the cylinder. A failed petcock diaphram will allow gas to run to the #3 intake even with the engine off. fuel will get in the cylinder and can at the very
least seep into the crank case, diluting the oil. At worst the combustion chamber may hold enough fuel to fill and bend a rod if the other cylinders fire on the first attempt. causing major crank/rod/engine damage.

Took me a long time to figure this one out. The diaphram only cost $9.Took the carbs off and rebuilt them twice. I took the head off thinking I had broken valves or hole in the piston. Finally picking up the fuel tank to re-install it and fuel was leaking out of the vacuum line onto the garage floor.

Good Luck.
 
DerekofMaldon said:
I know this is a late post. But maybe it will help those searching the archives.
If the#3 cylinder is not firing, no spark, Wet plug, Heavy smell of gas at the tail pipe.
CHECK THIS NEXT. THE PETCOCK DIAPHRAM!

Took me a long time to figure this one out. The diaphram only cost $9.Took the carbs off and rebuilt them twice. I took the head off thinking I had broken valves or hole in the piston. Finally picking up the fuel tank to re-install it and fuel was leaking out of the vacuum line onto the garage floor.

Good Luck.
Click to expand...
If you had found this site earlier (and found the common petcock problem), you would have missed all the experience you got pulling the carbs! But please note that CV carbs tend to get their vacuum off #2 carb, while the older VM got it off #3. That assumes that #4 carb is under your throttle hand.
Diaphram for $9 ???? I'm tempted to try fixing mine, despite all that I've read here- I must be feverish!
 
DerekofMaldon said:
I know this is a late post. But maybe it will help those searching the archives.
If the#3 cylinder is not firing, no spark, Wet plug, Heavy smell of gas at the tail pipe.
CHECK THIS NEXT. THE PETCOCK DIAPHRAM!
The fuel valve/petcock is operated by vacuum connected to the #3 intake. The diaphram has failed and raw fuel is being drawn straight to the cylinder. A failed petcock diaphram will allow gas to run to the #3 intake even with the engine off. fuel will get in the cylinder and can at the very
least seep into the crank case, diluting the oil. At worst the combustion chamber may hold enough fuel to fill and bend a rod if the other cylinders fire on the first attempt. causing major crank/rod/engine damage.

Took me a long time to figure this one out. The diaphram only cost $9.Took the carbs off and rebuilt them twice. I took the head off thinking I had broken valves or hole in the piston. Finally picking up the fuel tank to re-install it and fuel was leaking out of the vacuum line onto the garage floor.

Good Luck.
Click to expand...

Wrong carbs, BS series vacuum is on carb #2
 
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