http://experts.about.com/q/Motorcycle-Safety-Driveability-790/new-tires.htm
"The precautions are pretty simple--tires are "slippery" for the first 80 miles or so. You'll want to "heat cycle" them: warm them up (by riding on them for at least 20 minutes) and let them cool down (at least two hours) three or four times before they're properly broken in. You could do this all in a day, or you could do it over the period of a week or month, doesn't matter.
At first, the first 10 miles or so, they'll be like ice. Avoid dramatic accelleration, braking, and lean angles. Once they're warmed up, gradually lean a little farther and farther over, scrubbing in the sides of the tires a little at a time. You can even take a hard file and scrub that factory-fresh surface off them to help the process along.
After four heat cycles and 80-100 miles, they'll be broken in and ready for whatever you dish out.
Pat"
Another technique:
Use the old tire to skuff the slippery finish off of spinning new tire.
http://www.dansmc.com/tires1.htm
"New tires have a coating on them. This is a mold release coating. It let's the tire pop out of the tire mold easily. It also makes the tire slippery for a while, till it wears off. This process takes, maybe, 50 to 100 miles. Take things easy till the mold release is worn off. Using Goo Gone cleaner on new tires seems to help too."
http://www.timberwoof.com/motorcycle/faq/chickenstrips.html
"When you buy new tires, the best thing to do is to find an empty parking lot and do some lazy figure-eights. Make your turns progressively faster and with greater lean angles. The idea is to scrub off that goo under controlled circumstances. You never want to suddenly turn so hard that you're riding entirely on an area of the tires that hasn't been scrubbed off yet."