For the first tank, alternate between idle and a high idle, pulsing the throttle. Second tank, do the same thing. Third tank, drive it around slow, never going over about a quarter throttle. fourth tank, do the same thing. You can start driving it faster during the fifth tank, but it's still a new engine and needs to be treated gently. Don't let it run out of fuel. Right as the tank gets low, plug the exhaust stinger to kill the engine. Between every tank, rotate the flywheel around until the piston is at the bottom, then let it cool.