With plug out and you feel it spin free isn't bad that means theres no pinch. You know a engine is broke in when no pinch is left, check compression. Put in plug and turn if still very esy to turn i would say buy a better engine like werks. Not really worth pinching since its a rtr rngine and you can get werks engines for $200. Also if it was linking and the needle wasnt loose tighten the gold outsert by the nut at bottom of gold. Also seal the engine with sealent on carb, backplate.