From the gearbox output shaft the drive is transmitted by another shaft to the final drive assembly. The shaft consists of two tubular metal components bonded together by a rubber sleeve to form a single assembly, with a universal joint at the front to permit the shaft to move with the rear suspension, and splined couplings at both ends to allow for the alteration in effective length as the suspension moves through its travel.
The final drive assembly consists of the drive pinion which rotates on a combined hall and roller bearing and the crownwheel which rotates on a taper roller hearing at its right-hand end and a ball journal bearing at its left-hand end; since the rear wheel is bolted directly to a flange on the crownwheel left-hand end, these crownwheel bearings also serve as the rear wheel hearings. A castellated ring on the crownwheel right-hand end serves as the rotor for the speedometer impulse transmitter which is mounted on the final drive housing.
The rear suspension is by an hydraulically-damped coil spring suspension unit acting on a single-sided swinging arm; the arm is a single large aluminium alloy casting which pivots on taper roller bearings that are set on stubs screwed into the rear of the gearbox housing. The final drive shaft rotates inside the swinging arm and the final drive housing is bolted to its rear end.
The K75S model, and any other machine fitted with ’S’ suspension, is fitted with a suspension unit that is stiffened to match the front forks. The K100LT model is fitted with Boge Nivomat self-levelling suspension at the rear; this is described in detail in Section 10 of this Chapter and is listed as an optional extra for other models in the range.
Next Section: 2: Final drive: removal
1928 - R52 Final drive
1995 - R1100RS Final drive