Originally Posted by 1997bagger

Dyno tuning a new EFI engine during initial breakin, big builds with EFI have to be dyno tuned to assure of proper afr's, I know they still heat cycle them on the dyno but then I believe they turn them loose to set wide open throttle afr's.

Attached a completly opposite breakin article http://www.mototuneusa.com/break_in_secrets.htm

We are instructed on a big rig diesels to assure of oil pressure, no leaks and load the engine as soon as possible to build heat in the cylinders, chrome moly rings need heat and pressure to seal, this came from Cummins and Cat engine instructers. Different creatures but have aluminum pistons and chrome moly top rings, Is this best for a Harley, hell I don't know.