MZ BK 350 classic motorcycles for sale

History of the MZ BK 350

The MZ BK 350 stands out in post-war East German motorcycle development. Built in the 1950s, with known examples dating from 1957, this machine was designed as a powerful and reliable combination motorcycle, primarily used with a sidecar. Engineering highlights include the robust engine-gearbox-shaft combination, making it a reliable workhorse in both urban and rural settings. Its design paved the way for technical innovations and quality restoration practices, with a clear focus on maintaining both mechanical and aesthetic originality.

Model History

The BK 350 sits centrally in the MZ legacy, following the tradition of solid, shaft-driven motorcycles from East Germany in the decade after World War II. The predecessor models set the foundation for the advanced drive train featured in the BK 350. Over its production span in the 1950s, the BK 350 became a mainstay for professional and demanding private riders, with continued enthusiasm for its complex engineering even decades later. It has no direct successor within the classic MZ lineup – later models shifted in concept or technical philosophy.

Highlights of the MZ BK 350

One of the main highlights of the BK 350 is its innovative shaft drive, which brought smooth power transmission and lower maintenance compared to chain-driven models. The introduction of a VAPE ignition system is a common modernisation, boosting reliability and cold-start behaviour. Enthusiasts appreciate the option to convert the electrical system to 12V, making the motorcycle more compatible with modern lighting and accessories. Wheel construction with 3-crossed 200mm spokes strengthens the combination for demanding sidecar use. The BK 350 is also prized for its specialist rims and unique exhaust systems from manufacturers like Trommer. Restoration culture emphasises hand-lined paintwork and authentic frame details, especially on rare sidecars like the Stoye SM, produced only between 1954 and 1956.

Technical Data

Special Editions and Collectible Models

The Stoye SM sidecar stands out as a particularly sought-after special edition, produced only between 1954 and 1956. These sidecars feature matching identification plates and frames, highly regarded by collectors for their short production span and authentic historical connection to the BK 350. Hand-crafted interiors, including custom side panels and reworked seats, further add to their uniqueness.

Weak Spots and Common Issues

For potential BK 350 buyers, attention should be paid to the condition of the engine, gearbox and shaft drive, as these are the heart of the machine’s engineering. When restoring, the gearbox can be upgraded to use modern shaft seals to resolve common leak issues. Special wheels or rims should be checked for authenticity and condition, especially if the motorcycle is intended for combination with a sidecar. As always with classics, professional paintwork and lining as well as correct frame and sidecar plate details matter for both function and value.

Engine and Performance, Transmission and Handling

The BK 350 was engineered for strong and consistent performance as a sidecar combination machine. Its shaft drive delivers smooth power to the rear wheel with minimal loss, ideal for heavy-duty use with a sidecar attached. Upgraded VAPE ignition systems improve engine reliability, while the optional 12V system supports stable lighting. The triple-cross spoke wheels increase stability under load – especially in demanding or uneven road conditions. The transmission’s adaptability and the possibility to upgrade with better seals make long rides more manageable and less prone to oil leaks. - MZ BK 350 with Stoye SM sidecar (rare, authentic match of frame and registration plate, notable for only two years of production)

• BK 350 with custom Trommer exhaust (for enthusiasts seeking period-correct, hand-crafted components)
• Restored models with hand-lined paintwork and upgraded electronic systems

Interior, Comfort, Exterior and Design

Aesthetically, the MZ BK 350 impresses through hand-painted lines and expertly restored bodywork, often done by traditional workshops. Special attention is given to frame authenticity and hand-finished details. The Stoye SM sidecar offers thoughtfully designed interiors with side panels and custom-upholstered seats, enhancing both comfort and period charm. Specialist rims and period-correct exhausts contribute to the distinctive exterior, while 3-cross spokes and heavy-duty hubs signal the bike’s intended use as a sidecar machine.

Other relevant features

The MZ BK 350 can be adapted with a range of genuine or period-correct accessories to suit individual restoration goals. Original Trommer exhausts and unique hand-lining techniques are hallmarks of enthusiast-grade restorations. Paintwork is typically completed by professional shops specialising in classic motorcycles.

Summary

The MZ BK 350 stands out as a technically advanced motorcycle-sidecar from post-war East Germany, with significant attention paid to shaft-driven reliability, period-correct upgrades, and original restoration techniques. The statistics confirm its unique position within the MZ collector community, making it a singular focal point for enthusiasts seeking authenticity and technical excellence in a classic motorcycle.