The fellow who built my engine gave me a "Two-step" process to follow. Start the bike with good sized Boxfan blowing air on the engine. Let it run @ 2000 RPM for a few minutes and shut off for a few minutes. Repeat five or six times until the engine has completely warmed up. The following day pop off the rocker-box and re-torque the head while the bike is cold. Repeat this everyday until all the bolts remain tight. This took four days initially for the bolts to settle in. I re-torqued them at 25, 125, 250 and 500 miles. I'll check them again @ 1000 (since I still have two that get loose). As far as break-in, I am a firm believer in a "Hard Break-in". Don't let the motor run below 3000 RPM and don't be too shy with the throttle for the first 500 miles. As you accumulate mileage, you can get more aggressive with the acceleration. The object is to Seat the Rings. The best time for the rings to seat is when the hone marks on the cylinder are at their sharpest, when the cylinder is new. Cylinder Pressure is what forces the rings outward and causes the rings to seat. Going easy is the worst thing you can do for a new motor. Riding it easy (with low cylinder pressure) will allow for blow-by (which glazes the cylinders) and the rings won't seat. If you look at pistons that were subject to easy break-in, you would see all the discoloration on the skirts. Hard break-in pistons have clean skirts. This works for four stoke motors as well as two stroke motors. Race teams build motors and take them right to the track. I only did the short heat cycle in the beginning for torquing the head, nothing else. I don't know why people "Heat-cycle" new engines as a rule, because it serves no purpose that I can see. If you keep riding that bike easy, that oil will be black for a long time. Blow-by is what's turning that oil black and until the rings are seated, it will stay black. Don't be afraid to wind it up and make it work. As mentioned before lugging the engine isn't good either.
