I've got a 1979 GS850. Upon purchase, I rebuilt carbs, replaced o-rings, boots, fluids, adjusted valves, etc, etc, etc. I reckon a pretty thorough but standard going over. I set carbs to factory settings. It started up and, with the carbs set there, ran pretty good. I took it for a longer ride (50 miles or so) and, content with its performance, was ready to start on the aesthetic restoration.
As of last fall, it never ran again. It just wouldn't start. I checked valve lash again and replaced spark plugs. I noticed weak spark. I didn't want to fuss with points anyway, so I purchased a Dyna ignition for it and installed it hoping that would be it. Still no start. Weak spark and after several episodes of troubleshooting with Dyna, decided that the ignition was faulty. So sent that in for warranty replacement. With the new ignition installed, still no start. Still pretty weak spark. It doesn't start on starting fluid, but I do get a weak exhaust backfire. Checked and adjusted timing, no change. Changed ignition coils with a spare set I have, still weak spark. Check, double check and re-check Dyna wiring, fuses, factory wiring. Added a new AGM battery as the old one was weak. Still no start, very occasional and weak exhaust backfire, weak spark.
What am I missing? Help!
Thanks!!
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