Product parameters: Model: 4.0 horsepower jet pump Displacement: 55cc Transmission ratio: 2.08 (27:13) Number of cylinders: 1 Speed: 4500-5500 rpm Power: 2.9kw Gear shift: clutch Packing volume: 95*42*29cm Ignition system: CDI Cooling system: wind cooling Control system: tiller control Start mode: manual start Refueling method: No. 92 unleaded gasoline is recommended Gross weight/net weight: 13/9.7kg Bore*Stroke: 44*33mm Recommended engine oil: four-stroke engine oil Tilt angle system: manual tilt Size: 855*365*220mm Standard fuel tank: built-in 1.4l Adapted stern board height: 440mm Precautions: 1. Use four-stroke special engine oil (automobile and motorcycle engine oil); 2. Add oil according to the scale indication on the oil dipstick (the rotating cover), do not.