Features: High efficient three-stages air filter. Convenient and reliable start-up. Dust free clutch bearing. High precision fuel filter. High intensity magnesium alloy guard. and Light weight aluminum alloy blade guard. Fuel exhaust recycle equipment. Stable magnesium alloy frame for vibration reduction and weight reduction. Simple and smart cooling hose and high quality walbro carburetor. Pollution free and wear resistant ceramic cylinder block. Pollution free and wear resistant PVD piston ring. Convenient fuel intake hole. Easily adjustable blade guard. Considerate keyhole design for 25.4mm and 20mm. Features of PVD piston ring: 1. With visible oil-save efficiency 2. Improved surface hardness and reduced coefficient of friction, enhanced wear resistance of piston ring and prolonged service life of engine. 3. With excellent heat condution performance: to duce the temperature of engine by 15-35°C 4. With catalysis effects upon CO, CH, NOX,: Waste gas emission at 40%-60% which meets the requirements of environments protection.