I always do the figure 8 break in I was just being lazy I dont have my 2nd clutch set up yet and had a Cen flywheel and clutch nut laying around and wanted to at least get something done. I know the 3 race is nothing like the 5 and 7 though so it should be alittle easier. I figured if i went and got it up to temp 2-3 times and then put the clutch on it i could throw it on the track. I usually break in like this 2 tanks figure 8 real easy never over 1/4 throttle, heat gun to 180-190 get it up to 210-220, letting it cool between tanks. Then I will run 3 straight tanks through it leaning the LSN little by little, dont let the tank get low enough to lean out before refilling. After those 5 tanks I pretty much race tune it, get to the track early with it and run it as much as possible before the 1st heat. I use the heat gun for at least the 1st gallon of fuel, my 5 port for 2 gallons. It still wont turn over cold by hand with no plug. I never used the copper break in shim but will be using it on this mill.