I got my Jawa 210 back up and running a few days ago, it was out of commission due to ignition issues. I'm noticing now that it doesn't idle smoothly when stopped on the road, and you need to keep feathering the throttle. Also, it tends to stall if you brake quickly.
Another thing to note is that when it's idling on the center stand, it'll do okay for a few seconds, but as soon as the rear wheel starts spinning a little bit, it seems to fully engage, it spins the rear wheel up to like 30MPH. So as soon as as the clutch engages it tends to rev up rather high, and that causes the wheel spinning.
Sounds like a transmission/clutch issue to me, like something isn't letting go.
What do you think?