I just can't seem to wrap my head around this bike right now.
I bought it used in October and here is the brief history-
First ride- Good! bike performed great, about four hours of desert riding.
-First oil change
-Spark plug change
-Rewired LED tail light using the blue/white wire under the seat as a relay trigger.
Second ride- AZOP race, wouldn't start right away, required choke OUT to start, popped heavily on decel, surging on accel. We ended up DNF after lap 2 because it stalled and wouldn't start.
-Second oil change
-Second spark plug change
Third ride- Bike behaves ok when cold. Still a bit surgy/poppy. After warming up it abruptly died mid 4th gear on the throttle to DEAD. It behaves in a fairly predictable way. Bike starts, runs poorly, dies after several minutes even at WOT. Bike won't start for several minutes (5-8?) then all of a sudden it will fire and the timer starts again. I get as far down the trial as I can before it abruptly stalls and the cycle repeats. I've found that as long as it sits for a bit it will fire, even after running poorly and dying.
-Changed oil again
-Change spark plug agian
-Removed the carb and cleaned EVERYTHING- it looked pretty good but I was very thorough. Did a couple odds and ends (easy adjust Air/Fuel knob, verified throttle stop, repacked the muffler, etc)
After reassembly the bike ran like a dream- for about two hours. The idle started smooth and steady but after two hours of cruising around town stoplight to stoplight it went from 50mph steady throttle to dead. After that it started a slightly offbeat idle again and died at a red light. Now its suddenly behaving like it did before the carb cleaning.
Now I'm not sure where to go next! I'm now leaning towards electrical- stator? idk. What do you think?