October 22, 200718 yr What a strange question The internal flow resistance of the motor will limit the RPM to well within the mechanical strength limits of the motor. A standard 315 motor with throttle held open in neutral may rev up to 8000 - 9000 RPM. The upper end of the useful power range is probably around 6000 RPM.
October 22, 200718 yr You could also hold it at full chat until it nips, then after you've rebuilt it you'll know exactly how long you've got to stop it next time.
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