Typically any engine that is ringed needs to be broke-in slowly and VERY rich...so much that you almost need to leave the glow ignitor on the first coupla tanks. After that slowly lean it out, little by little, so on the 13-15th tankful you are at full lean + a few clicks open. Any different than this would probably work just fine...depends on how long you want the engine to last though. You can either do it right or cut a few corners...the choice is yours.