hi first time out with my new baja,bought off ebay so new to me,anyways,very difficult to start,the baja haS the walbro 813 carb so there is no choke,anyways finally got it started,running great except kept stalling,started it up 3 different times,fourth time,after 2 pulls ,pull start wont pull any more,will i have to take it apart,no idea what happened,not even turning engine over,any suggestions,thanks