ORIGINAL: TedMo
Don't know where you are getting your info but 4 full turns will not do anything other than cause it to run very rich. Which is a good point to start from. Thereafter you can gradually lean it out but continue to run rich for several tank fulls. As I stated after 2-3 tanks lean out to normal 2 cycle by using needle valve allow to run leaned but back and forth between rich and lean for couple tanks. DO NOT use throttle at this time to alter speed; this will be done after several tanks that have enabled motor to break in piston with liner. After this usually break in can continue in the air. Do so with rich runs, bring to lean then back out couple clicks. Of course break in method can vary some depending on particular motor, ringed, abc,etc. but this method will do no harm and will work for any motor. Some will take longer to become FULLY broken in that's all.
That's just not the right way to break in an ABC-type engine. It needs to be slightly rich, not blubbery, 4-cycle rich. Having it that rich will not accomplish anything positive, and may actually damage the engine. ABC-type engines need to come up to their designed operating temperature to have a proper piston/cylinder fit. Keeping it too cool just puts undesirable strain on the engine.