There are people on here and other boards and people i've talked to in real life that brought their bikes straight from the dealership to the track and the motor is fine thousands of miles later.Under 8k for the first 600 miles, change the oil. Still go at least a 1000 before you really hammer on it. No constant RPMs, try and keep the motor varied in RPM, rev (accelerate) up and let it come back down on the motor that sort of thing (helps seat the rings), don't rack up all 600 miles on the highway.
Yamaha actually recommends below 8300 for the first 600 miles, and below 9900 until 1000 miles.
Yeah I know a couple people from machine shops that say the same thing actually, something about taper cut rings, and so and so on. The last rebuild on the big block in my dad's Cougar he asked the machinist about break in period, and the machinist asked how far the track was from the house.There are people on here and other boards and people i've talked to in real life that brought their bikes straight from the dealership to the track and the motor is fine thousands of miles later.
they also rebuild the motors EVERY RACE........ just sayin:secret okeI break it in the way I intend to ride it everyday....HARD.
Why seat your rings never crossing 8-9K RPM and expect it to last when you finally take it to 16k.
EVERY racing event has this method of breaking in. NHRA builds an engine every run and they run it hard to the max, plus every other racing organization.