I was recently gifted a John Deere X500 that had not been started this year. Service history has been great, professionally serviced. Battery was dead so it would not start.
The transmission was disengaged so the mower could be delivered, but I re-engaged it and now the mower does not move when pushed (hydrostatic system).
Oil levels are fine and I added some gas to the tank; I am fairly certain there was still some older fuel in the tank.
I attached the mower's battery to my car battery for a boost per the manual.
I engaged the parking brake and locked it in place. Fast throttle, choke all the way open, turned the key. Engine starts for a few seconds and is puffing out exhaust smoke, but then dies. After that I am not able to get much more than some initial catching and little combusted gas fumes.
What should I be investigating next?