@Patrick: Where did you get that idea?
Break in only means that you don't run the same RPM for a long period of time. Avoiding high RPMs is not recommended as you can make a cylinder lazy or build up a wall of debris at the top.
How I break in my kits (Never seized one):
Mount it with plenty of oil on the piston and cylinder.
Mix around 30:1 jet rich.
Start the engine. Let it idle for 2 minutes or so.
Start riding it. Keep it in low revs while it's cold.
After 10 or 15 minutes of so, ride it like you stole it.