Swisher Shindaiwa E4-S3000 E4 24-1/2cc 4-Stroke Engine Commercial Grade String Trimmer 24.5-CC E4 Hybrid engine produces 1.15-Horsepower and gives the power and torque of a 4-stroke engine while having the light weight and all position operation of a 2-stroke Fuels like a 2-stroke, using a 50:1 mix, but remains up to 25-Percent more fuel efficient than similar displacement 2-stroke engines. 20.3 Fuel ounce. Fuel tank. Patented power boost chamber supercharges the engine to give it even more power and torque. 2 Ring piston and cylinder is chrome plated for durability and longevity Handle mounted start/run/stop and throttle controls put all functions at your fingertips Non-CARB Compliant/Not For Sale In California