My Toro lawnmower featuring a Briggs-Stratton 7.25HP motor has been losing power lately. It is about 2 years old and I've used the maintenance kit (spark plug, air filter, oil, & fuel treatment) to prep it at the start of each year. This year, it has really been struggling however. Typically, when I start it up, it oscillates between running strong and puttering out a few times before it's either ready to go or putters out completely. These symptoms have gotten progressively worse until it won't start at all.
I used a carb cleaner a few weeks ago, which really helped to get it going again but the problems came back a few weeks later and additional carb clearner doesn't seem to be helping anymore. This past weekend I bought another maintenance kit for it but it still won't start at all.
It may be of significance that I think I may stress it a bit with cutting tall sometimes wet grass as well as with taking it around my very uneven back yard.
Any advice would be appreciated!