I finally got my battery in the mail today, so I figured I'd pop it in and see what works. To my surprise, the answer was "quite a bit". Horn, lights, starter motor, blinkers, etc. I popped a spare spark plug on one of the plug wires- no spark.
Just for fun, I pulled the points cover and gave the points a good swipe with some sandpaper. I checked again, and was rewarded with that sweet, sweet little blue blinkey light.
Time for an experiment.
I grabbed a bit of starter fluid, took apart the airbox, shot some into the carbs, and hit the starter button again- and that thing, however briefly, ran under its' own power for the first time in probably decades.
Time for another experiment.
I have a aux. fuel bottle "IV" tank. The only problem is that this model of CB750 has two fuel inlets, one for carbs 1 and 2, the other for 3 and 4. Well, I don't have a splitter (yet), so I did the best I could to at least fill up all 4 carb bowls by swapping the line back and forth. After I was happy I hit the starter again, and managed to get a decent 1-2 minutes of continuous runtime.
After my happy dance was done I figured I was only hitting on 3 cylinders, but that's 3 more than I was expecting. One I get a more solid fuel delivery setup I can troubleshoot, but hearing that puppy roar to life was like music to my ears.
Watch this space! I'll be to sure to have updates, and maybe a video or two.....