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Not sure about a rotary lawn mower, but I always thought that lawn mowers had a fixed blade speed. If yours is adjustable, I would say that a faster speed would make a smoother cut.

Faster speed will indeed give a smoother cut, BUT if this is achieved by running the engine faster, ( the only option, if the blade is mounted directly on the crankshaft end ) then more stress develops and engine life shortens.

This will become acutely apparent if the blade tip strikes a solid object, when the excessive speed will cause much greater damage than if the blade had been running at the manufacturer's designated rpm.

Consequently, the cut will probably then become somewhat ragged due to distortion and vibration, and the engine will eventually self destruct.

So, better or not ? Your call.

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15y ago

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