You'll probably get ten different answers to your question. So I'll start by saying break in to your manuals specs is the best bet.
I start em, and blip the throttle until it gets to 200* and shut it off. Rotate flywheel to bottom dead center, and let it fully cool. Then do it again, getting it to 200*, shut off and cool. Even if you have to lean it out to get it to 200. Do that about 4 times, then you're ready to drive it around the driveway varying the throttle and making sure the temps are around 200-220. Do that for a tank or two and far as I'm concerned you're ready to race.