Have replaced air filter, spark plug, Oil & Fresh Gas & made sure fuel line was not clogged.
We did find nest of roaches in air filter, and cleaned everything we can easily access.
Choke on or off just does not seem to even want to start. Of course warranty expired a month ago.

21" cut/mulch/rear bag 173cc OHV Engine

Chad C Orlando FL, August 2009

Try squirting the plug with a shot of starting fluid reinstall it. Also you will need a spray can of SeaFoam (found at napa $10) if the starting fluid let's it start spay the seafoam at high idle into the carb wait five minutes repat the process. Most likely carbon deposits from cheap gas has gummed up the float and low idle jet. Hope the info helps All Hail the mighty SeaFoam.

Blade929, August 2009