Well I was considering a rebuild but I'm scared to say, I'm not the first to split the cases on this engine. With less than 20k on the speedo, I must assume that either 1) the speedo is not accurate or 2) whoever went in there first did something wrong, is why it won't run.
I did have spark, although rather weak, and I'm positive I got enough fuel to run, even a couple tries with just starter fluid.
I'm not scared of rebuilding carbs, it's jetting away from stock I've not done yet.
The rings look great. Pistons, cylinder walls, cam lobes, all look fantastic. I don't see any damage whatsoever. Just the right amount of wiggle at the con rods. I finally got the ruined bolt out of the starter motor and took it apart to find normal carbon buildup but no damage or heavy wear. It spins very well off the bike. Heck it spins very well ON the bike, just doesn't turn the engine with it.
I better take more photos. Someone after me might need it. Goodness knows I've been under-whelmed by the amount of knowledge on this machine. It's not a throw-away bike, it's a rather rare old Honda that is not marred by bad engineering, other than this stupid starter clutch and the notorious ignition system problems, which are easily accessed and diagnosed.
I've split cases on a parallel twin before but I have never done this particular job. Will it be easier to pull the good starter clutch off the donor crank, or should I replace the whole crank? Won't replacing the crank involve main bearings? I need info from those who have done a crank before, please....