Shake Shake Shake

YR, relax;, I was not intending to contradict what you said as regards balancing.
I was merely posting my experience and conclusions about the CF flyweight issue on my engine.
It was so subtle that I initially dismissed it as belonging to the engine and went thru the entire diagnostic from back to front, and voila with the clutch off, the engine ran dead-smooth for a 270* cammed engine. So I put it back together with a new factory 340 disc. ... and there it was again, ever so subtle. And that is when I blamed the flyweights. And now that I knew what it was, and the work-around, I no longer cared about it.
I don't know a single thing about balancing my crank. I took everything down to the shop and told them I was gonna be spinning this thing to 7000 regularly, and didn't care if it shook at idle. So when the subtle vibration showed up I initially blamed the balance, and since I had told the crankshop I didn't care about idle shake, I just ignored it.
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But eventually,after a few years, I got curious.
Besides now was a good time, because another 340 disc had ejected it's dampersprings. Now that's a vibration!
17 minutes guys. 17 minutes to remove;
the driveshaft, the front exhaust and mufflers, the hi-mount shifter,unbolt the GVod ,and drop the Passon boxed A833. All by myself. On a 4-post drive-on hoist.A lot of that time is in the shifter, cuz the top bolt has to be removed from inside the cab.
85 pounds is that A833 with the Passon box and side-cover, the GV adapter, and full of dyno oil. You can do it three times a week if you have a mind to...............
I ditched the CFII disc within a few weeks of installing it, cuz it was just too harsh. It's been collecting dust on the take-out shelf since about 2000/2001. But the 340 discs don't take the abuse, lasting a year or two at most. They; throw out the springs,crack out the hub, or tear off either the linings or the Marcel. I have never replaced one for worn linings; torn off and shredded yes; but not worn out. If you go this route, buy a couple and keep a spare handy. Or find a heavier Duty disc.
I reduced the initial clamp-load by spacing the PP away from the flywheel. I guess I couldda removed the flyweights, but I use them in certain situations.