The most popular dual purpose single in the 250+cc category, the F 650 GS has become the standard upon which single-cylinder dual purpose motorcycles are judged. Aggressively engineered for unrelenting performance in harsh environments, the F 650 GS was designed to take riders off-road and on to new frontiers. The 2005 model features a list of significant improvements including the new 2 SPARK ignition system, a 3-position clutch lever, newly designed windscreen, accessory power socket, and improved on-board electronics.

Engine Type Displacement 652 cc Bore X Stroke 100.0 mm X 83.0 mm Horsepower 50 bhp @ 6500 rpm Torque 44 lb/ft @ 5000 rpm Valve Gear DOHC, chain-driven with bucket tappets No of cylinders One Compression Ratio 11.5 : 1 Engine Management BMS-C II with two spark ignition Valves per Cylinder Four Valves 2 x 36.0 mm intake / 2 x 31.0 mm exhaust Fuel Tank HDPE, internal pump and external filter Alternator W 400 Watts @ 14 Volts Battery V/AH 12 Volts / 12 Amps/hour Engine Summary This rev-happy Rotax single cylinder engine features a four valve combustion chamber with dual overhead camshafts. It's sturdy, lightweight, and unlike a lot of single cylinder engines, does not vibrate at high speeds. Proven by BMW single cylinder GS models in the grueling Paris-Dakar rally, this motor is surprisingly smooth, extremely durable, has a narrow profile, and is perfect for short blasts or long-distance hauls.