Rocketman, I thing the best way is a nice trail ride, The main thing is don't hold it wide open for to long, and dont hold one thottle position for to long. After 200 k start riding harder, after 300k she's ready to ROCK!
I think I put a quart in my frist two tanks, just to be safe. And I would go the 400 miles or 4 hours route. Thats what I did on my MXZ 670. Vary the throttle a lot, and you'll be fine. I wish my 02 was broken in. Only has 85 miles on it, and I put all 85 on in one day back on Dec. 1st.
I have found, the more you baby it, the more it breaks. All i do is let it idle for a few min to get it warmed up, go for a little ride(like less than a klm), and then hammer on the throttle on the way back.
I used 6 ounces of oil in my 10 gallons of fuel in the tank for the first tank, riding nice and easy, well somewhat easy. My ZRT is still running strong. filled it 6 times now, don't worry about running it empty the oil will be gone anyway.
Racers that I know run them wide open from rebuild to the end of the race weekend with no breakin time or oil in the gas, but they are racing, then again you can't win blown up, sometimes they do blow up but not often.
Just ride it the way you feel comfortable, as an old wise man once said, "does 'break-in' not also mean 'broken'?"
Good Luck with the 670, I know one person who lost his 1997 MXZ 670 2 times due to Weisco, and 2 times to Tempa Flow, or was it 4 times due to improper tuning?
oil in the gas is to help breakin the bearings, since it sounds like you only did top end adding oil will make the rings take longer to break in. to much oil can actualy hurt the rings bye not letting the heat transfer to the cyl. walls, over heating the rings, not very comon but it happins. in theirey less oil is best for ring seating.
I personaly use the 20/20 method on breakin; 20 miles or 20 minutes wich ever comes first (bye that time you'll know if somthing was installed incorectly, or wrong parts used, ect.) & its time to hammer on it! & as every one els has said no "extended" WOT for a hundred miles or so ( to keep from over heating rings before they seat)
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