Model F9.9 Short Shaft 4-Stroke. Specifications: Cylinders: 2. Displacement: 212 cc. Compression ratio: 9.46:1. Shaft (S): 15″. Prop shaft hp: 9.9 hp @ 5500 rpm. Weight: 87 lb. Control: Gear – fwrd, neutral and reverse. The F9.9 can be paired with a duel thrust propeller to make a great sail drive outboard for heavier displacement boats. Microcomputer ignition adjusts timing to maintain optimum engine performance, economy and power under all conditions. Yamaha’s shallow water drive helps keep the propeller and lower unit out of harm’s way in shallow water.