Different people, different answers.
The official line is under 4,000 rpm until the first service at 600 miles, then gradually increase maximum revs thereafter. Don't let the engine labour.
Other people say that you should work the engine hard right from the off as it beds in better and rubs off the microscopic rough edges in a new engine.
I've tended to follow the official line and my bike has used no oil at all so far. I've ridden it "hard" within those parameters. Seems to work OK for me and my bike.
Other views?
J