Update--
Pulled the carburetor off today for cleaning, and to see just how it was jetted. Continuing on the odd train, it looks like the main jet is a 130 (!). Didn't get a good look at the pilot jet. Honestly, I'm not even sure it was marked.
I gave the float bowl and jets a good cleaning, then reinstalled. Battery seems to be behaving today, so I kicked her over and got her running after I messed around with the throttle idle screw (the sprung screw the throttle spring rests on). Idled fine after I pulled the enricher (choke knob) out all the way.
Tried messing around with the airscrew (little flathead screw under the brass throttle plate, right?) to get the idle to sound right-- it didn't like that and died with a bit of dusty smoke from the air filter. Huh.
Questions-- is the jetting waaay too high? Running stock BS-29 Mikuni carb with the K&N air-filter, and what looks like the classic exhaust. I live in the rural Northeast, so I'm not exactly up there with elevation. Superchuck, you mentioned in another thread that you're running a 120 main jet-- should I be jetting this thing down? Seems to have a pretty hard time starting.
Also, in regards to the air screw, how tight is tightened all the way? When I tighten it to where it feels like it was before, seems like I hit a small spring (bit of a creaking sound). Should I keep twisting until it's locked down all the way before backing it off, or is the spring the extent of how far I should screw the airscrew in?
Thanks guys,
RP