I'm on my 3rd Kubota zero turn. Most have been trouble free but this last one not so much. I was mowing yesterday for maybe 45-60 mins and it stalled. I turned the key to re-start and it cranked but acted a little fuel starved. I've had the clogged fuel tube issue in the past, but this was a bit different. Sometimes when warm, I have a hard time starting and have to play with the choke (and even though its been running, I may still need the choke for a second or two which seems odd to me). I stopped, turned the key again and I swear I saw flames coming out the back (muffler?). I stopped and hopped off the mower and the flames were out. i almost feel like I imagined it but I decided I was done for the evening. I just went to try again. It cranks but just doesn't turn over. I think I need a pro at this point. However, its tough finding someone available. Am I in this for a new engine? Its several years old but has under 300 hours. Thoughts? If i have to buy a mower, any pointers on buying a used one?