Hi,

It was working very well, but after I replaced a new EZ START SPARK
PLUG REFRJ19LM bought at LOWES, and added 93# High Grade Gas, I can
not re-start it after I used it, in a word IT CAN NOT RE-START WHEN IT
IS HOT !!

But I can start it when the machine is COLD.

Trouble shoot doing one thing at a time.
1. replace the gasoline with regular If the mower now starts ait use to
problem solved.
If that doesn't work
2. Remove the easy start and replace it with your old sparkplug or a new
identical one.
If it still doesn't run, you have possibibly triggered a third problem. Which
could be one of several ranging from flooding (fuel mixture too rich) to a
defective coil.