The BMW K100 series, produced from 1983 to 1992, represents a significant chapter in BMW's motorcycle history. Available in several variants including the Standard, RS (Road Sport), RT (Road Touring), and LT (Luxury Touring), these motorcycles were engineered to offer a sophisticated and refined riding experience, competing in the premium touring and sport-touring segments. Key innovations included a unique transverse inline-four engine with a low center of gravity, a clean shaft drive via a single-sided swingarm, and powerful dual front disc brakes, often featuring Brembo calipers. Renowned for its build quality and rider comfort, the K100 series provided a high-capacity 460-watt alternator and optional ABS on later models, showcasing BMW's commitment to performance and technology for long-distance journeys.
This comprehensive Factory Service Manual (FSM) provides detailed guidance for the maintenance, repair, and troubleshooting of the BMW K100 series motorcycles from 1984 to 1993. It covers all major systems, including the engine, fuel injection, ignition, transmission, brakes, electrical system, and suspension. The manual offers step-by-step procedures for scheduled maintenance, component disassembly and reassembly, and in-depth diagnostic strategies for identifying and resolving issues. With precise technical specifications, torque values, and clear wiring diagrams, this resource is an essential tool for owners, mechanics, and technicians seeking to maintain the optimal performance and longevity of their K100 motorcycle.
The BMW K100 is a family of four-cylinder 987 cc motorcycles that were manufactured by BMW from 1983 to 1992.
Various models of the K100 were produced.
K100, with no fairing.
K100RS, with sports fixed fairing and lower bars.
K100RT, with full fairing for 'road touring'.
K100LT, with a higher screen and additional equipment as standard for 'Luxury Touring'.
All models have dual front, and single rear disk brakes. The RS model has a longer gear ratio than other models.[3]
The K-series offered additional refinements including: all stainless steel exhaust, rust-resistant aluminium fuel tank (although tanks do rust at the low points on right and left sides), anti-lock brakes or ABS on later-year models, adjustable headlight, high capacity 460 watt alternator, Hella accessory plug-in, self cancelling signal lights.
The engine has its four cylinders arranged so that the crankshaft is on the right-hand side of the motorcycle, with the cylinder heads, camshafts, injectors and spark plugs on the left-hand side. This arrangement keeps the centre of gravity relatively low, which benefits handling; and the space behind the front wheel available for the radiator.
In addition, since the crankshaft is now on the right-hand side, access to the engine becomes much easier than in a conventional design, where the crankshaft is at the bottom. BMW preferred a shaft-drive for smoothness, and a single-sided hollow swing arm enclosing the drive shaft provided right side drive through the gearbox and to the rear wheel. The 4-into-1 all stainless steel exhaust exited on the left hand side.
Brakes were twin-pot Brembo onto undrilled discs. Two different forks manufactures were used: Showa with an outer upper tube diameter of 1.612 in (41 mm) and Fichtel and Sachs measuring 1.627 in (41 mm). In later models, the standard swingarm was replaced with a Paralever just as on the K1.
The BMW K100 is a family of four-cylinder 987 cc motorcycles that were manufactured by BMW from 1983 to 1992.
Various models of the K100 were produced.
K100, with no fairing.
K100RS, with sports fixed fairing and lower bars.
K100RT, with full fairing for 'road touring'.
K100LT, with a higher screen and additional equipment as standard for 'Luxury Touring'.
All models have dual front, and single rear disk brakes. The RS model has a longer gear ratio than other models.[3]
The K-series offered additional refinements including: all stainless steel exhaust, rust-resistant aluminium fuel tank (although tanks do rust at the low points on right and left sides), anti-lock brakes or ABS on later-year models, adjustable headlight, high capacity 460 watt alternator, Hella accessory plug-in, self cancelling signal lights.
The engine has its four cylinders arranged so that the crankshaft is on the right-hand side of the motorcycle, with the cylinder heads, camshafts, injectors and spark plugs on the left-hand side. This arrangement keeps the centre of gravity relatively low, which benefits handling; and the space behind the front wheel available for the radiator.
In addition, since the crankshaft is now on the right-hand side, access to the engine becomes much easier than in a conventional design, where the crankshaft is at the bottom. BMW preferred a shaft-drive for smoothness, and a single-sided hollow swing arm enclosing the drive shaft provided right side drive through the gearbox and to the rear wheel. The 4-into-1 all stainless steel exhaust exited on the left hand side.
Brakes were twin-pot Brembo onto undrilled discs. Two different forks manufactures were used: Showa with an outer upper tube diameter of 1.612 in (41 mm) and Fichtel and Sachs measuring 1.627 in (41 mm). In later models, the standard swingarm was replaced with a Paralever just as on the K1.