No idle circuit on number 2 carb???

[Outlander]

I have a 1980 Gs 550E. I have rebuilt my carbs as specified in the gs resource documentation. All o-rings have been replaced. Intake manifold boot o-rings have been replaced. Carbs all had a 24 hour soak in Berrymans carb cleaner. All passageways blown out, and dried thouroughly. New plugs have been put in. Carbs have been bench synched. Valves are within normal parameters.

I use my choke, bike starts just fine. I let her warm up, and then take the choke off. She idles down to 1100 rpms. I went to adjust the fuel/mixture screws as the carb rebuild series suggests. I turn them in until idle falls off, then out until highest rpm is achieved. This worked great on carbs 1, 3, and 4. On carb 2, turning in or out did nothing. At idle, the cylinder is not running. As soon as I hit throttle, then she fires on that cylinder. I have good compression on all cylinders. I don't know why the number 2 carb is not supplying fuel to the cylinder. Once the bike moves off of idle, she fires nicely, got a good burn, and tons of power. Just nothing at idle. Any ideas?

[flyingace]

If you let the bike warm up, then idle for a while, then pull the #2 plug, what does it look like? Plug condition will tell you a lot here.

[Outlander]

I pulled the plug after it was idling for awhile, and it is normal. I don't see anything wrong with it. Not wet, not carbon fouled, or oil fouled. Dry as a bone.

[flyingace]

I can't draw any other conclusion than something is plugging the idle circuit in #2 carb. You've pretty much concluded that already. Maybe a bit of corrosion you can't see that is hard to dislodge?

Maybe other users have ideas about what else it could be.

[mikluha]

Try running some Seafoam through your fuel system. I also celaned my carbs by dipping a couple of months ago and did everything you did expept I synced using guages. It never idled properly untill I ran two bottles of seafoam through them in 300 miles.

[Outlander]

I think I missed this step in my carb rebuild series. I don't know if that effects idle though. Guess I am pulling my carbs out again. I will double check them again and go thru this step until I can get spray to come out of the other hole.

I will also double check my pilot screw passage ways. Something is definately not right, so I will try again......

[tkent02]

Try vacuum synching the carbs. If one cylinder is doing nothing at idle, the idle adjustment will do nothing as well. Bench synch does you no good here, just gets it close enough to get it running so you can do a vacuum synch.
That passage in the float bowl isn't it, that just provides fuel to the choke.

[Nessism]

Try vacuum synching the carbs. If one cylinder is doing nothing at idle, the idle adjustment will do nothing as well. Bench synch does you no good here, just gets it close enough to get it running so you can do a vacuum synch.
That passage in the float bowl isn't it, that just provides fuel to the choke.

Vacuum sync you say... (I suggested this two different times in Outlanders last thread on this problem:shock

[Outlander]

Well, I went an vacumn synched my carbs. Took a bit, not really sure I know what I am doing here, but I believe I got it in the ball park. Thanks for the help! She runs and drives great, plugs are better, so I am going to stop fussing with her now.

Just cosmetic issues to work on now.

[tkent02]

Well, I went an vacumn synched my carbs. She runs and drives great, plugs are better.

Amazing...

[Outlander]

Amazing...

I was hoping I could get away with not doing it, but alas, I know that if all else I have tried, I have to do what needs to be done. I was actually surprised at how much of a difference it has. I didn't have to turn the screws much either.

Thanks Nessium, tkent, for your patience and help with my bike.