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I personally get great results equipping it with thin oil, 10W30, just idling the thing for the first minute, take it very gentle, ride it down the street a good mile, in a start-stop motion (accelerate, engine brake), staying below 5mph, and come back riding below 10MPH in start-engine brake motion.
Let it cool down for at least 30 minutes, 1 hour or more for a 150+cc, and start again, doing a series of WOT accelerations to 10MPH, and engine brakes. After an hour or so, take it upto 20MPH, then one hour to 30.
Best results with WOT accelerations, to a certain speed limit. Don't let your engine rev too high though..., followed by engine braking.
Usually, the engine has some grinding/odd vibration feeling to it. It'l go away, after a few miles of start-stop travel. Once the engine feels kinda smooth, test it out on the higher speeds. Don't do WOT top speed for at least not the first 50-75 miles.
Some people say to change the oil at 50 miles, I'd say anywhere between 75 and 100 miles. The carbon in the oil helps filing off the cylinder walls, and besides, at 50miles there's not too much debris in the engine oil yet.
Change engine oil at 100, 300, 600, 1000, miles, and every 1000-2000 miles (1000 miles for thin oils like 5W30, 10W30, and 10w40, and 2000 miles for thicker oils like 15W40, and 15W50)...
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