My machine is low on power, what is happening?
This is likely to be caused by a dirty air filter, this should be cleaned or replaced
alternatively if you are cutting tall grass try raising the cutting height on your lawn mower.
a dirty spark plug could be giving a weak or intermittent spark this should be cleaned or replaced
Lastly, a build-up of clippings or debris could be the fault, try cleaning the underside of your lawn mower deck.