had a few questions about engine break in, just turned over 600 miles on my 08 busa. Think i might have hit a tad over 6000rpm's once, accelerated fairly hard pretty often but normally kept it to a max of 5000. As long as i don't go over the recommended rpm's, it wouldn't hurt anything accelerating pretty hard up to 5000 right? After 600 miles, changed my oil and cleaned chain today, am i good to go now. Is the engine completely broken in and ready for action!!