I think running is is less criticl than many people says. For the last two years a hav eran throug abaout two tanks on the box, half tank each time then let it cool down for heatcycling. ( i think this is important ). Then i have just threw it on the track driving it noce for 5-6 tanks, then tuned it to almoast racetune. At the races, even when the engines is almoast new, i lean it to run just as fast as the other engines of the same type. I keep the pinch for 4-5 liters, then it loosesns up and temps drop a bit. I get around 14-16 liters out of my engines before i use them as practice engines until they starting actig up. or, i bust out my dremel and go wackers to try and learn something usefull.

People says, ohhh, my engines loosens up right before the 2 gallon mark, and i think, What is the point? Running a half decesnt engine for that long time, what is the point?

Just my two cents on the brakein thingy :-)