BMW R51-R66 SPORT R61-R71 TOUREN 1939 ERSATZTEILLISTE

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🏷️ Basic Information Identification Make: BMW Model: R51, R51/2, R61, R66, R71 Model Variant: Sport, Touren, Ersatzteilliste Year: 1939-1951 (approximate range covered by models referenced) Codes Chassis Codes: R51, R51/2,...

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Type: Motorcycle

Vendor:

Sku: 602647

Tags: 1939 BMW Motorcycle Motorcycles R Series R51-R66 SPORT R61-R71 TOUREN

Product variants

Description

🏷️ Basic Information

Identification

Make:

Model:

R51, R51/2, R61, R66, R71

Model Variant:

Sport, Touren, Ersatzteilliste

Year:

1939-1951 (approximate range covered by models referenced)

Codes

Chassis Codes:

R51, R51/2, R61, R66, R71

Engine Codes:

M253 (R51/R51/2), M254 (R61), M255 (R66), M256 (R71)

👋 Introduction

Market Position

Era Context:

Represents BMW's high-quality motorcycle engineering in the pre-WWII and immediate post-war era.

Competitive Analysis

Competitors:

Competed with other premium European motorcycle manufacturers of the time, such as Norton, Triumph, and Moto Guzzi.

Key Features

Engineering Philosophy:

Emphasized robust construction, shaft drive reliability, and boxer engine performance.

Target Audience

Audience:

Owners, mechanics, restorers, and collectors of vintage BMW motorcycles.

📋 Manual Details

Coverage Areas

Coverage Type:

Parts Catalog / Ersatzteilliste

Specific Models Covered:

BMW R51, BMW R51/2, BMW R61, BMW R66, BMW R71

Designations:

Sport, Touren

Page Count

Estimated Page Count:

100-200 pages (typical for this era and type of catalog)

Manual Type

Type:

Ersatzteilliste (Parts List/Catalog)

Language

Language:

German

Format

Format:

Printed Document (likely spiral-bound or stapled booklet)

📖 Manual Coverage

Systems Covered

Engine:

Component breakdown and part numbers for the boxer twin engine

Transmission:

Parts for the 4-speed manual gearbox

Drivetrain:

Shaft drive components, rear wheel hub, differential

Suspension:

Front leading-link fork components, rear plunger suspension parts

Brakes:

Drum brake components for front and rear

Electrical System:

Magneto ignition, lighting components (headlight, taillight, dynamo), wiring harnesses

Fuel System:

Carburetor parts (e.g., Bing), fuel tank components, fuel lines

Exhaust System:

Exhaust pipes, mufflers

Controls:

Throttle, clutch, and brake levers and cables

Frame And Body:

Frame members, fenders, fuel tank, seat components

Wheels And Tires:

Wheel rims, spokes, hubs, tire specifications

Procedures Included

Part Identification:

Detailed diagrams with numbered parts for precise identification

Part Number Reference:

Assignment of official BMW part numbers for ordering

Assembly Breakdown:

Visual breakdown of how components fit together

Technical Depth

Depth:

Component-level part identification and sourcing

Application:

Essential for restoration, repair, and parts procurement for these classic BMW motorcycles

📊 Manual Specifications

File Format

Digital Format:

N/A (assuming original print)

Print Quality

Print Quality:

Original print quality, typically line drawings and text

Binding Type

Binding:

Likely saddle-stitched or stapled booklet

Paper Type

Paper Type:

Standard paper stock for technical documentation of the era

⚙️ Engine Specifications

Primary Engine

Engine Type:

Air-cooled, horizontally opposed (boxer) twin-cylinder four-stroke

Displacement:

R51/R51/2: 494cc; R61: 597cc; R66: 600cc; R71: 750cc

Bore X Stroke:

R51: 68 x 68 mm; R61: 68 x 80 mm; R66: 72 x 73 mm; R71: 78 x 78 mm

Power Output:

R51: ~24 hp; R61: ~26 hp; R66: ~30 hp; R71: ~28 hp (approximate, varies by specific tune and model year)

Engine Construction:

Cast iron cylinders, aluminum heads (initially, later variations may exist)

Fuel System

Carburetor Type:

Typically dual Bing carburetors (e.g., Bing 1/24/x)

Fuel Type:

Leaded gasoline (historically), modern unleaded with appropriate octane rating

Ignition

Ignition System:

Magneto ignition (e.g., Bosch)

🔧 Transmission

Standard

Transmission Type:

4-speed manual, foot-shift operation (later models may have slight variations)

Gear Selection:

Heel-and-toe shifting mechanism

Features

Drive System:

Shaft drive to rear wheel

Clutch:

Dry single-plate clutch

📐 Dimensions

Exterior

Wheelbase:

Approximately 1400-1450 mm (varies by model)

Overall Length:

Varies by model, typically around 2100-2200 mm

Weights

Dry Weight:

R51: ~160 kg; R61: ~170 kg; R66: ~180 kg; R71: ~195 kg (approximate)

🛡️ Safety Features

Ratings

Crash Safety:

Not applicable to modern safety rating standards. Focus on mechanical integrity and rider control.

Active Features

Braking System:

Drum brakes front and rear.

Passive Features

Lighting:

Headlight, taillight, often with a brake light function activated by rear brake pedal.

💡 Technology Features

Infotainment

Features:

N/A (no infotainment systems in the modern sense). Focus is on functional instrumentation.

Driver Assistance

Features:

N/A. Rider awareness and mechanical skill are the primary 'assistance'.

Connectivity

Features:

N/A. Mechanical connectivity only.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Historically every 2,000-3,000 km (refer to specific model documentation for exact intervals).

Valve Adjustment Interval:

Recommended periodically, especially before long tours or after significant mileage. Exact interval depends on usage. Typically checked every 5,000-10,000 km.

Gearbox Oil Change:

Recommended annually or every 5,000-10,000 km.

Shaft Drive Maintenance:

Regularly check and replenish lubricant in the final drive. Typically every oil change.

Fluid Specifications

Engine Oil Type:

SAE 40 or SAE 50 monograde oil (historically). Modern equivalents would be high-quality motorcycle-specific oil.

Engine Oil Capacity:

Approximately 1.5 - 1.75 liters (varies by model, refer to manual).

Gearbox Oil Type:

EP (Extreme Pressure) gear oil, SAE 80W/90.

Final Drive Oil Type:

EP (Extreme Pressure) gear oil, SAE 80W/90.

Known Issues

Crankshaft Bearings:

Potential wear on crankshaft main bearings over time, especially with high mileage or infrequent maintenance.

Carburetor Wear:

Wear in the throttle slides and barrels of older Bing carburetors can lead to poor idling and fuel mixture control.

Shaft Drive U Joint:

Wear or damage to the universal joint in the shaft drive system.

Magneto Coil Failure:

Aging ignition coils within the magneto can fail, leading to no spark.

Oil Leaks:

Common with older motorcycles due to aging seals and gaskets.

📚 Vehicle History

Brand Heritage

Founding:

Bayerische Motoren Werke AG (BMW) founded in 1916, initially focused on aircraft engines.

Motorcycle Start:

Began motorcycle production in 1923 with the R32, establishing the boxer engine and shaft drive configuration.

Model Evolution

R51 Introduction:

Introduced in 1938, a sportier iteration than its predecessors.

R51 2 Introduction:

An updated version of the R51, produced post-war until 1950.

R61 Introduction:

A touring model with a larger engine, introduced in 1938.

R66 Introduction:

BMW's first 600cc production motorcycle, launched in 1938, positioned as a high-performance sport model.

R71 Introduction:

A more robust and utilitarian model, introduced in 1938. Notably, it was the basis for the Soviet IMZ M-72 motorcycle.

Production

Wartime Impact:

Production of civilian models was significantly curtailed during WWII, with many motorcycles requisitioned for military use. Some models like the R71 were adapted for military purposes.

Post War Production:

Resumed after WWII, with models like the R51/2 continuing production.

🏆 Awards & Recognition

Recognitions

Historical Accolades:

While specific awards are unlikely for parts catalogs, these models were recognized for their engineering, durability, and performance in their time, contributing to BMW's strong reputation.