Jiffy gasoline powered 4-stroke OHV engine. Powerful commercial grade engine, E-Z start in cold weather. Quiet - 4 stroke engine is quiet but powerful. Low maintenance - no mixing of fuel. HTT (high torque transmission) Jiffy's proven heavy-duty clutch and optimum gear ratio transfer more engine energy for additional torque. Stealth STX - serrated ripper blade and power point blades last 2-3 times longer than other blades on the market cutting 25 percent faster. The STX blades have a 2 year limited warranty. The Jiffy 4G is covered by the Jiffy 2 Year Limited Warranty warranty. Easy Snap Blade Protector included.