Breaking in a new yzf450??

I just bought a brand new 09 yz450f for 5500 otd, i think i got a good deal. Anyways, im going riding tomorrow and want some advice on how to break it in, how long do i have to take it easy for?

the idea is to have several good heat up and cool down periods

I keep the rpms under 70% and change the oil before you really open it up.

how long do i have to take it easy for?

About 30 minutes. You have a manual, I would guess, since you bought it new (if not, someone owes you one). Look on page 1-9.

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