Back to Bike FinderYears: 1928 · 1927 · 1926
BMW R42
1927Allround

BMW R42

Key specifications

Engine
494 cc
Power
12 HP
Fuel type
petrol
Transmission
3-speed
Front brakes
Expanding brake (drum brake)

Overview

### Introducing the 1927 BMW R42: The Icon of Classic Motorcycling Step into the world of classic motorcycling with the 1927 BMW R42, a motorcycle that embodies the spirit of innovation and craftsmanship that BMW is renowned for. Positioned as an allround motorcycle, the R42 was designed to meet the demands of a growing post-war market, offering both practicality and performance. Its charming aesthetics are matched only by its robust engineering, making it a standout choice for enthusiasts and collectors alike. With its unmistakable silhouette and captivating history, the R42 is not just a motorcycle; it’s a testament to an era of elegance and functionality. ### Engine Performance and Riding Characteristics At the heart of the R42 lies a 494 cc two-cylinder boxer engine that delivers an impressive 11.96 horsepower at 3,400 RPM. This four-stroke powerhouse is ingeniously designed with a balanced 4.9:1 compression ratio, allowing for smooth power delivery and a surprisingly brisk top speed of 95 km/h (59 mph). The air-cooled engine, combined with a 3-speed gearbox and a reliable shaft drive, provides a unique riding experience that’s both exhilarating and manageable for riders of all skill levels. With a fuel consumption of just 3.00 liters per 100 km (78.41 mpg), the R42 proves to be an economical choice for those long, scenic rides. The leading-link front suspension and rigid rear ensure a stable ride, whether cruising through the countryside or navigating city streets. ### Key Features and Technology The R42 showcases several key features that highlight BMW's commitment to quality and innovation. Its steel double cradle frame not only adds to its durability but also enhances handling, while the expanding front drum brake ensures reliable stopping power. With a front brake diameter of 150 mm (5.9 inches), safety is prioritized without compromising on style. The motorcycle's dimensions, with a length of 2,100 mm and a weight of 126 kg (277.8 pounds), strike a perfect balance between agility and stability, making it easy to maneuver in various conditions. Additionally, the kick starter brings a sense of nostalgia, allowing riders to connect with the traditional methods of starting their machines. ###

Pros

    Cons

    • Vintage Charm: The R42’s classic design and iconic boxer engine make it a standout in any collection.
    • Economical Performance: With its impressive fuel efficiency and manageable power output, it’s perfect for both leisurely rides and spirited adventures.
    • Robust Engineering: The combination of a durable steel frame and reliable shaft drive contributes to a stable and enjoyable riding experience.
    • Limited Speed: While 95 km/h is decent for its time, modern riders may find it lacking in acceleration compared to contemporary motorcycles.
    • Basic Features: The technology and features may seem rudimentary by today’s standards, lacking the advancements common in modern bikes.
    • Maintenance Needs: As a vintage motorcycle, the R42 may require more frequent upkeep and attention than newer models, which could be a consideration for potential owners.

    Technical details

    Source specification data

    Make
    BMW
    Model
    R42
    Category
    Allround
    Starter
    Kick
    Power
    11.96 HP (8.7 kW)) @ 3400 RPM
    Clutch
    Dry-single plate-cable operated
    Gearbox
    3-speed
    Top Speed
    95.0 km/h (59.0 mph)
    Fuel System
    Carburettor. 20mm BMW Spezial
    Bore X Stroke
    68.0 x 68.0 mm (2.7 x 2.7 inches)
    Compression
    4.9:1
    Displacement
    494.00 ccm (30.14 cubic inches)
    Cooling System
    Air
    Engine Details
    Two cylinder boxer, four-stroke
    Fuel Consumption
    3.00 litres/100 km (33.3 km/l or 78.41 mpg)
    Greenhouse Gases
    O2
    g/km. (
    O2
    -
    Carbon
    dioxide emission)
    Lubrication System
    Wet sump
    Transmission Type Final Drive
    Shaft drive (cardan)
    Overall Width
    800 mm (31.5 inches)
    Overall Height
    950 mm (37.4 inches)
    Overall Length
    2,100 mm (82.7 inches)
    Weight Incl Oil Gas Etc
    126.0 kg (277.8 pounds)
    Seat
    Single seat
    Rear Tyre
    3.5-26
    Frame Type
    Steel doble cradle
    Front Tyre
    3.5-26
    Front Brakes
    Expanding brake (drum brake)
    Rear Suspension
    Rigid
    Front Suspension
    Leading link
    Front Brakes Diameter
    150 mm (5.9 inches)