For those that have been following the ongoing saga with bated breath....
After putting together a pinout for the Motronic 2.2 connector (which i'll pdf and link once i clean it up a little), i tested the water temp sensor again, along with the air temp sensor, and found them to be within spec. I took another try at reading the error codes and still got nothing. I tried out the throttle position sensor test, and found it unresponsive- ignition off the light stayed steady regardless of throttle position or adjustments to the tps; ignition on the light flickered very dimly and very fast no matter what. Checked a couple other things that aren't coming to mind at the moment, and the results were consistent- the inputs were fine, the outputs were bizarre.
All of this finally lead me back to... the accursed Motronic box. Nothing else made sense. i bought a used one from kbikeparts.com, plugged it in, and the bike fired up for the first time in 3 months on the first press of the starter. :yow Too late to shake it out for the Michigan trip i was planning next month, but a relief just the same.
Now to track down a fuel tank filter sock, some spark plugs, and better vacuum caps for the throttle body ports, and try to figure out where all these damn screws go...
