Breaking in a rebuilt engine?

I'm just about finished my first engine rebuild on my 2008 YZ450. I replaced the crank, piston, cylinder and head. Do I need to break it in like a brand new bike, not at all, or somewhere in between? Thanks.

Break it in like new. There are a couple different methods....they are on here I'm too tired to write it all out, but search and you shall find.

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