I spent some time this last weekend with putting some TLC back into the motor. I just recently re-honed the jug, and put a new piston in it. The old one was still just fine for the 1500+ miles of life it had on it. Malossi makes great jugs.
New bearings, new reeds, new gaskets. When I had the intake off, I polished (inside) it and smoothed the lip of the adapter from the carb adapter and intake. I completely rebuilt the carburetor and put on a new filter. At 50+ (pegged) I still have plenty of throttle left. I'm afraid to push it really hard, because over 10K RPM, I worry that it is going to throw itself to pieces. It would probably be fine, but I don't want to see my work ruined. It's great for cruising town at a much more reasonable 30-40 mph. I have also cleaned all the stickers off of it, and it looks much cleaner than it did. Maybe some pinstriping in the future? Also, I'm trying to hunt down the chrome crash bar set for this. I hope to run across one second hand.
Edited to say:
This speed is on the flat with no wind.