Exploring the Simson S51 Moped: A Glimpse into a Classic Era

Exploring the Simson S51 Moped: A Glimpse into a Classic Era

Introduction

In the world of classic mopeds, few evoke as much nostalgia and admiration as the Simson S51. Manufactured by the VEB vehicle and equipment factory Simson Suhl, this iconic Mokick was produced between 1980 and 1990, following in the footsteps of its predecessor, the S50. With over 1.6 million units produced, the S50/S51 series holds the distinction of being the most produced small motorcycle in Germany.

Engine Concept and Innovations

The Simson S51 brought significant innovations compared to its predecessor, particularly in the engine department. The introduction of a newly developed two-stroke engine (M531/541 or M542 in the S51/1 models) marked a departure from the S50. This engine boasted a changed stroke-bore ratio and external crankshaft seals, making it easier to maintain and slightly more robust.

One notable change was the arrangement of the shaft seals, allowing the petrol-oil mixture to lubricate the crankshaft bearings. This innovation led to a reduction of 100 ml in the transmission oil fill quantity. The long-stroke concept of the new engine provided more pulling power in the medium speed range, addressing the challenges faced by its predecessor on inclines.

With power figures of 2.7 kW (3.7 HP) and a displacement of 49.8 cm³, the S51 delivered a maximum speed of 60 km/h. The introduction of a four-speed gearbox, in contrast to the previous claw gearshift, allowed for greater flexibility and ease of use. The kickstarter mechanism was also revamped, making it possible to change the shaft without dismantling the entire engine/gearbox block.

Variants and Features

The S51 series was characterized by its modular construction, leading to minimal differences between variants. Notable models included:

• S 51 N (Normal): Minimal electrical equipment, no battery, and designed for low-maintenance use in areas with little traffic.

• S 51 B (Better): Equipped with indicators, hydraulic rear wheel dampers, ignition lock, and a lead accumulator. Available in various versions with different gearboxes and headlight wattage.

• S 51 E (Enduro): Introduced in 1982, this model featured raised exhaust, high handlebars, larger speedometer, shortened mudguards, adjustable rear wheel dampers, and bellows on the telescopic fork.

• S 51 C (Comfort): Built from 1983, this variant largely corresponded to the S 51 B2-4 but included additional features such as a tachometer, side stand, and upholstered benches.

Driving License Regulations

In Germany, the S 51 can be driven with a Class AM license, despite its maximum speed of 60 km/h, thanks to an exception in the standard contract. However, this exception does not apply to re-imports.

Legacy and Popularity

The enduring popularity of the Simson S51 is evident in its widespread distribution, with over a million units built. Even today, there is a thriving market for spare and tuning parts. The S51's simplicity, undemanding technology, and modular design contribute to its status as a sought-after classic.

Conclusion

The Simson S51 Moped stands as a symbol of a bygone era, encapsulating the spirit of freedom and adventure. Its innovative engine, modular construction, and various models catered to a diverse range of riders, ensuring its place in the hearts of enthusiasts. Whether in its unrestored original condition or meticulously restored to its former glory, the Simson S51 continues to weave its story into the rich tapestry of motorcycle history.