Powerhorse | 63389, Wood Chipper, 4 In. 420ccPowerhorse Wood Chipper, 4 In. with 420cc Engine The Powerhorse rotor wood chipper is perfect for professional arborists and large property owners. With its high speed chipping system and robust OHV engine, it easily handles branches and limbs up to 4 inches in diameter. Ideal for efficient and effective yard maintenance. Model: 63389 Features: 420cc Powerhorse OHV engine features electric start and generates 3600 max RPM 4 in. Chipping capacity with