I have been running lawnmowers and cutting grass since 1952. Reel type walk behind, rotary walkbehind and finally in 1972, got my first CC.
The ONLY time I ever ran any of those engines full throttle was when I was either showing off or I wanted to get maximum lift and/or discharge from the mower deck. I have tillers and snowblowers. Don't run them fast either.
I run them just fast enough that I don't want to hear anymore racket out of the equipment which is usually about 3/4 throttle.
I have 100's/thousands of hours running small engines and I've never torn up or worn out any of them.
Your experience may vary.
PS. The Cub dealer here has always advised cutting grass at WOT but I suspect that was the older decks would cut better when run at a faster speed. I've found the newer decks aren't that rpm sensitive.
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