"Jeff Wisnia" wrote in message
...

I've got a 21" Toro self propelled rotary mower with a 3.75 hp Briggs
engine on it.

Whe I used it today for the first time this season I had a feeling the
engine might be running a little slower than it had in the past, as I
seemed to be walking "less fast" to keep up with it

Most newer mowers don't even have a throttle control - they run full-tilt
all the time. Mine does anyhow. They do this partly to save money but also
because the control just isn't needed.