I think we were talking hydros, not engines. The hydro units I own have fans to cool the hydro unit so you need to keep the rpm up to keep the fan moving air over the unit. Every recommendation I've ever seen from actual users has been to keep rpm in the upper range and adjust your speed with the hydro control. Higher engine speed keeps that all important tip speed on the mower blades high enough to get a good cut.
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Today's Featured Article - Talk of the Town: How to Crank Start a Tractor - by Staff. This interestin discussion is from the Tractor Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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