Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Check the coil gap. I would go ahead and re-gap coil(s) while you are in there. If you need instructions, please let me know. If it is not starting once warmed up, sounds like the coils may be getting too hot and you are losing the spark needed to run the machine
Let me know how the gap is and out come of re-gap.