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[ZX6Ray]

I have heard evidence directly from a honda tech that used to work in Japan who now lives in california that the reason these manufacturers "make up" a break-in period is for people to get safely accustomed to their brand new bike and not drive into a tree the day after they buy it. This is another way how manufacturers cover their asses. Unlike in the 70-80's engine honing is now more "polished". The surfaces of the cylinder walls are much more smoother than they used to be. Especially in Japan where QA is the backbone of thier pride. It takes much less time now to properly seal the piston rings to the cylinder walls. If you go easy on it for the first 600 miles, the cylinder walls will loose too much excess material and not get a chance to grind down the piston rings to completely seal the gap between the rings and the walls.

I say get it broken in properly by taking it through the rpm's in 4 easy steps. Before each step let the bike completely warm up 180-190F is where you want it. In between steps make sure you park the bike and let it cool completely then let it heat up throughly. This is for the importance of getting the engine to go through heat cycles.
1) Take bike up to 4K, deaccelerate in 1st gear. Repeat once.
2) Take bike up to 6K, deaccelerate in 1st gear. Repeat once.
3) Take bike up to 10K, deaccelerate in 2nd gear. Repeat once.
4) Take bike up to 14K, deaccelerate in 2nd gear. Repeat once.

Don't apply 100% throttle in these cases. Bring it up to the rpm's gradually and safely on a good road with no cars if you have no experience riding.

Change your oil and filter immediatly with 10W-40 of yamalube or kawasaki oil. I know it sounds crazy but what is crazy is the amount of tiny shavings you will see in the oil. You don't want that crap to keep recirculating.

At this point ride it however you want but bring it in for the 600 mile service.

Change your oil again with the same type oil at 1000 miles. There's a lot of shavings that end up in the oil so this is why you change it often in the first 1500 miles.

At 1500 miles it's time to switch to synthetic if you want. Amsoil, Motul and Repsol are the most reliable brands to go with. At this point you can change the oil every 3000 miles or shorter depending on what you do with your bike. i.e. track or commute.