2018 300 Hp Yamaha Four Stroke Outboard Motor Bore x Stroke: 96 x 96mm (3.78 x 3.78 in) Compression Ratio: 10.3:1 Alternator Output: 70 Amp Gear Ratio: 1.75 : 1 (optional for counter-rotating) Operation: Digital Electronic Control (DEC) Trim and Tilt: Power Trim & Tilt with TotalTilt™ Horsepower: 300 hp Prop Shaft RPM: 5500 rpm (at 300hp) Full Throttle RPM Range: 5000 – 6000 rpm Fuel System: Electronic Fuel Injection (EFI)