Can downward air harm or reduce cutting efficiency)?
Yes, unless you are using 2 orange or 2 yellow, high downward air (from higher speeds) may have an effect on certain light grasses. When running too fast there will be some fast moving air blowing downward that may push the grass aside, making some believe the leading round part of the cutter is not cutting the grass. Recommendation: Run slower by using part throttle, there will be very little air moving downward to push the grass to the side. Rest the head on the ground and gently slide it into the grass to be cut, using the outer edge of the swath. You will also benefit with a substantial fuel saving, a much quieter operation, more control, and a more pleasant trimming operation.
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