Still searching for the problems with this thing. My old CPS was actually fine -- just needed to clean the terminals and resistance is right at spec.
I've been through every connection and tested for continuity in all the the leads for sensors, injectors, and coils to the ECU plug:
- Cleaned all the male pins and spades & pulled out all the female terminals and tightened them all up a bit for better contact
- Cleaned all the pins on the ecu connector
- Tested the charging system
- Coils tested good and getting good spark on both plugs
After I got things back together, I took it out for test ride, and it was running better but still a bit rough and would stall while idling. I had to increase the throttle stop screw to get it to idle. But it would fire right back up each time. Then I stalled out, and it did all sorts of crazy stuff, I'd start it up and the engine would wind up suddenly and die. This went on for a bit so I searched on my phone for possible causes. Then for no reason it ran the best it has so far, and I was able to ride it about 2 miles back home. Not sure if this was related to the previous incident but on the subsequent test ride, the throttle plate linkage was binding up at the rear pivot. I borrowed some WD-40 from the guys setting up for a 1/2 marathon here in Philly and was back on the road.
Next mornin', I start it up for another test run and the engine climbs to about 3K rpm and then back down -- seems normal for cold start. It dies 3 blocks from my house and won't start back up. The ECU relay under the seat would sometimes click on and off repeatedly when I cycled the ignition switch on. I could hear the fuel pump start and stop each time the ECU relay energized the fuel pump relay. I jumped the fuel pump which worked just fine. Then for no apparent reason, it started to click on and off normally, and the ECU & fuel pump relay sequence has worked every time, but it's running pig rich as before on both cylinders throughout the entire rpm range, hot or cold with the smell of gas from the exhaust and plugs & intake valves wet with fuel.
Only thing left, it seems, is the ECU.