Lawnmower Air Filters in Canada
The lawnmower is going to need a replacement air filter. At worst when you go to start it and it just sputters, this could be the culprit. Some of the most popular replacement lawnmower air filters include the Maxpower 334378 for Honda engines and the HQRP foam air filters found in Briggs and Stratton motors. There are a wide variety of air filters to choose from , so have a look here to find yours:
Lawnmower Air Filters in Canada.
Or forget the filter thing, and just get a whole new mower: