Air screw adjustment.....again

[Dave8338]

It also seems like a very lean setting, but time and plug chops will tell....

True...the "chops" never lie. Let us know what you find...

[Pacman]

It sounds to me like you have a low speed circuit issue on 3 of your carbs. Because it is running rich I would expect a problem with the air part of that circuit. But, it could be both air and fuel that's a problem.

A test for whether you are getting good air movement (and fuel movement) in the low speed circuit is to use compressed carb cleaner to blow through the system. (Just dipping carbs is not enough. You have to make sure all the passages are free and some form of this check is the only way to do it).

Pull the carbs and locate the low speed circuit air jet located at the aircleaner side of the carb throat. Pull the float bowls and plug the pilot jet with your finger or your friend's finger. Make sure you hold the carb cleaner can tip tightly to the low speed circuit air jet and blow through. You should see a solid hard spray (not just a dribble) come out of the idle passage in the engine side of the carb throat. Then cover that idle passage in the carb throat keeping the fuel jet covered too and blow through again. You should see a solid spray come from another passage in carb throat right where the butterfly valve is. This "off idle" passage is often neglected or even known about and is what gives you extra fuel when you pop the butterfly valves open from idle.

Give it another spray while holding your finger over the two idle passages in the throat of the carb and watch for a solid spray out the pilot fuel jet.

If you don't get a good solid spray on any of these then there is a clogged passage that needs to be addressed.

Chris

[Jackbob]

No problem. Yes, on some of my bikes, it simply refused to idle at all without that vac line plugged. I just use a phillips head screw driver shoved in the line, works well. It likely is the source of your problem, as you had to turn it out so far just to keep it running that once you plugged it, its way rich. Give it another go and let us know if it worked!

TCK

Thanks Cafe Kid - yes i will do so this weekend and report back.
Thanks
Jackbob.

[Jackbob]

TCK Feedback

Yea tried re syching with the vac line pluggged - still carb issues and took another GS for a spin on the weekend (Psy Guys) - much smoother/better than mine and good to compare.

Anyway have decided to install a spare GS1000ST head and larger 30mm
(I think) VM slide carbs + pods as these are in much better nick. Also my inlet rubbers were dodgy and the spare head has good ones so worth the effort cost wise.

Waiting for gaskets etc. Yes i know about the cam timing differences.

Plus more top end power no doubt! Yee hah.

Thanks.