I am *so* not comfortable riding faster than 120/70. Faster than that, i'm uncomfortably aware that i make an excellent sail. 100 is a breeze, 120 is a pleasant wind, 140 is a bit of a storm, and 160 is "i wonder if i let go would i float". I'm suspecting the answer is no to that. Not for very long, anyway. It's an excellent control system.
Break in: Well, sort of. Took the engine out, put rings in it, just about back together now.
If this doesn't work... F'it. Big bore comes early. Then *definitely* 18/30 on the sprockets. I did all the math, and think i came out to 3800 at 140, down from 5000.