Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Ozone smell, a pungent smell ? Likely the brushes arching on the armature. Brushes can be worn excessively or the armature can be shorted out. Motor will fail soon. It will require a new motor to repair! Sorry
ignore the above response, it was to go to an electric lawn mower!
You have no start? Is battery voltage above 12.5 volts? Do you hear solenoid click when turned to start? This is Deer Buck?
I see question is still open, did you find probelm?