07-24-2017, 07:26 AM
I believe (and so do the engine builders I know) that combustion pressure is necessary to seat the rings. You can't get combustion pressure without aggressive throttle opening. If you are familiar with the CBR 1000RR (2008 and on) oil burning issue I think the problem engines did not seat the rings. Mine never burned a drop of oil because it was broken in correctly. This does not mean you should run wide open for a 1/4 mile but rather apply goodly amount of throttle then back off and engine break (which sucks oil to the top end). With today's manufacturing tolerances break in is not even necessary in some engines. Most race engines are broken in on the dyno with a number of strong pulls to seat the rings. Heat is the main issue and so avoiding extended high RPM running and steady state RPM high speed cruising is needed until several head cycles have occurred. I also change the oil before the 600 mile service and always have because I want the metal shavings out after the aggressive break in method I use. Honda years ago placed RPM / speed restrictions in their break in instructions; not anymore.