Social distancing achieved! First ride anywhere out of the 'hood, but the tacho drive spat its guts out the bottom somewhere along the way. Had issues with it before, but thought I'd gotten it fixed. New innards are unobtainable, and repop drives are not cheap. And I certainly wouldn't want to put a repop on just to end up with it exploding, too. Guess I gotta get to the bottom of what actually happened.
To sum up:
On first startup, tacho cable sheared off (or was already sheared) ostensibly due to a frozen bearing in the gauge. Not realizing, I replaced cable which promptly sheared itself off.
Found tacho drive not functioning at all. Discovered guts had displaced themselves outboard inside the housing, the cover almost coming off but being retained by safety wire. Found that it ran fine if I took off cover and used a probe to press the gear inwards towards the timing cover while cycling the kickstarter. Reassembled with the cover holding the gear in to this depth, staking it in place with a punch in 3 places.
Put new cable on with newly-serviced tach. Ran fine for several test rides and the first 2/3 of our Social Distancing ride yesterday. Heading home, I saw the tach was dead...in driveway, took cable off to look for the issue and found I was seeing the ground from the cable end of the tach drive. I didn't even know there was a cover underneath, but apparently it shat its innards out in the other direction this time...
So now the question is what to do...hmmm. I have another tach drive of the improper ratio. Dunno what kind of diagnostics I can do on this. Doesn't seem like it could be the interface with the cam shaft which drives it, otherwise it just wouldn't work...and the camshaft is obviously turning just fine. Ugh, dumb, expensive stuff here.
Also gotta richen the idle mix just a tad, I think...after it was heated up and running nicely, it still liked having a little bit of choke on from the air lever at the bar while idling at stoplights.