We had our Mini Z 19/52 just idling yesterday when the motor started spitting and sputtering and then shut off. Smoke then came out from it. Tried cranking it, the motor will barely turn, sounds like its locked up. Oil was fine, no oil coming out. I took the pump drive belt off and tried to crank and same thing. Anything else I can check to make sure it is the motor or does this sound like the motor blew? It is a Kawasaki 19 with only around 300 hours.