just picked up a gravely 34z/15hp kaw motor. the dealer mechanic said its best to keep them full throttle while useing, it runs cooler that way. is there any truth to this? ill be running full throttle most the time anyway, but was just wannting if he knew what he was talking about. he said hes seen people burn there motors up cause of not running wot. anything special i need to look for on a kaw motor, potential problems??