Having problems with my JD GT235 lawn tractor starting, if it does start the when it gets warm it dies. I changed the fuel filter, what can I check next. I did check the fuses and they all appear to be in working order. What next?

These kinds of problems are thermal. You probably loose spark. That you should check. That primarily leaves the spark plug (intermittant), the coil or ignition module if so equipped.

Yep, the coil is probably beginning to break down.

Igot a 240 john deer lawn tractor it don't start but it backfires spins good but no run

That has a igniter on it this is what usually causes this.
Luck

Hi,
The GT235 had two engines. Do have the Vanguard or the Kawasaki.
Peace,
Clarke