The Yamaha F20 outboard engine is one of two very similar engines in the Yamaha range, the smaller Yamaha F15 being the little brother of this Yamaha 20hp outboard engine.
There are several different Yamaha F20 models. The standard Yamaha F20 is steered and controlled by the tiller handle and it is a manual pull start engine. There a simple lever-operated system for forward and reverse gears. The built-in fuel tank gives a sensible range for a small outboard engine. There is a coupling for the (supplied as standard) 25 litre Yamaha fuel tank to give a longer range.
There are then several model varations of the Yamaha 20hp engine, with different shaft lengths, remote control and electric starting options.