Alright, so my right cylinder's not firing, and I can't really figure out why. I hadn't ridden the GS for a while, and decided I'd DIY advance the ignition (http://gstwin.com/diy_timing_advance.htm) before I took it for a spin. Did that, the bike started kind of hard, and, once started, would barely pull me to 50 mph. Upon further inspection, I found that only the left cylinder was firing.
I want to think I messed up the mod somehow, but I've got spark at both cylinders, and the problem persists, even at when the rotor is set at stock settings. Is there something easy to miss here?
Anyway, fuel appears to be good. I had rejetted it a few weeks ago, but that went over just fine. Still, just to be safe, I pulled the carbs, cleaned the jets, and checked for any vacuum leaks. No dice.
The only other option, aside from a dead cylinder, is valves. I checked them, two are tight, and I've ordered the valve shim tool. Does this sound logical? Or is there something stupid I'm missing?
If the only thing you changed between it running right and not running was the ignition mod then im sure that it must be that which is wrong by logic. Changing the timing of the ignition could result in your right cylinder firing at the wrong time, i.e. without fuel or not firing at all when the engine is running. Your best bet would be to put everything back to how it should be in terms of the ignition. Check that it runs right again, then if you wish to try the mod once more do it again in the hope of getting it correct.
Hahaha, just figured it out. One of the magnets in the pickups/sensors stuck to the rotor when I disassembled everything. I set it aside, and accidentally put it back in backwards: at the time, I wondered why it didn't want to fit. She runs good, now.
And it took me a week and a half of staring at the bike to figure that out. Go figure.
Well its fixed now and thats all that matters, happy motoring!