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I will leave that one for Ken for a thorough reply. I had major problems at first with the governor so it was running way too fast its first hour. I don't know if it hurt it or not. After the first hour, I knocked the top speed down to around 1,600 and ran at various speeds, changing the throttle position every 15 minutes. I changed oil/filter at hour 2 and changed oil/filter and dropped the pan at hour 7. You will see quite a bit of ring dust. When I dropped it at 27 hours, very little dust was apparent. And I think most of that was stuff still circulating from the inital breakin. You will definitely smell the friction for the first 2 hours as the rings start breaking in the the knurls on the sleeves. After 2 hours I retorqued the head bolts and they had loosened A BUNCH! At hour 7 only the center bolts around #2 and #3 had loosened somewhat. All of them were on the nose at 27 hours. Also recommend that you check valve clearances at 2, 7 and 30 or so. Be generous with oil changes and filters. Don't cut corners now that you are ready to fire her up. DO NOT RUN IT AT SLOW IDLE THE FIRST SEVERAL HOURS! You don't get enough oil pressure for a proper breakin. Hope this helps. I would like to here how others went about breaking in.
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