So, I'm riding my new to me (3 weeks ago) Fut home from work today. At 65 mph, the engine just stopped running. Fortunately traffic was light, so I was able to safely coast across 4 lanes of freeway traffic to get to the shoulder and stop. The basic electrical system is fine, the engine turns over strongly, there is no shortage of juice. The damn thing just won't fire up, there is either no spark, or no fuel getting into the cylinders. The instruments all looked normal, the gauges did the normal power-up sweep, and there were no EFI faults indicated. I couldn't tell if the fuel pump was running becasue of all the noise along the freeway.
Additional info: I did remember to check the killswitch, that was definitely not the problem.
Luckily, 40 minutes and $100 later we were safely home via flatbed. As soon as we get the bike pushed into the garage, just for kicks I hit the starter and the damn thing fired right up. I was really hoping this would not happen, because I can't fix it if it aint broke. So, there is an intermittent problem with either the fueling or the sparking. Can't say if its temperature related, but that is my guess right now. Any ideas, other than just ride the thing around until it happens again, and hope I'm in a better situation to troubleshoot it when it breaks?
Since buying the bike, I've installed the aftermarket rectifier/regulator, and soldered the crimps on the connectors. The original wiring was in good shape. I also lifted the tank, and inspected/cleaned-up the routing of the wires between the cylinders. I've put at least 150 miles on it since doing this work, so I don't think that the problems are related to anything I've done.