Featuring a two-valve-per-cylinder, single-overhead-camshaft design that provides better breathing and more power. An optimally balanced crankshaft and labyrinth exhaust deliver smooth power, while Microcomputer Ignition adjusts timing to maintain maximum engine performance, economy and power under all conditions. An intake silencer and manifold result in more direct airflow, for minimum noise and maximum power. An acceleration pump on the F20 gives the engine the fuel it needs--when it needs it--like during rapid throttle advance. This ensures responsive acceleration.