Historical Significance:
Essential reference for enthusiasts and restorers of classic British motorcycles from AJS and AMC brands.
Value Proposition:
Provides hard-to-find, consolidated technical data for a range of iconic motorcycles, enabling accurate maintenance and restoration.
Data Comprehensiveness:
Consolidates technical specifications across multiple models and years, offering a single source of truth for vital data.
Primary Coverage:
Technical specifications and data for AJS and AMC motorcycles.
Secondary Coverage:
Historical data, model variations, engine types, chassis details, electrical systems.
Estimated Page Count:
Varies significantly by specific release and scope, typically 100-300 pages.
Type:
Technical Data Manual / Specification Compendium
Format:
Likely printed book or PDF document.
Engine Systems:
Engine configurations (e.g., single, twin), bore, stroke, compression ratios, valve timing, lubrication systems, ignition systems.
Transmission Systems:
Gearbox types (e.g., constant mesh, pre-unit), gear ratios, clutch mechanisms, final drive ratios.
Chassis And Suspension:
Frame types, suspension travel, fork specifications, shock absorber details, steering geometry.
Braking Systems:
Brake types (drum, disc), master cylinder sizes, caliper specifications, brake pad/shoe details.
Electrical Systems:
Ignition coil resistance, dynamo/alternator output, battery specifications, wiring diagrams (often included in related service manuals).
Fuel Systems:
Carburetor models and jetting specifications, fuel tank capacities, fuel pump types (if applicable).
Technical Data Provision:
Detailed specifications for engine components, chassis parts, electricals, and performance figures.
Model Identification:
Data to identify specific models, engine variants, and production eras.
Performance Benchmarks:
Top speed, acceleration figures, power output, torque curves (where available).
Depth:
Comprehensive technical data, useful for restoration, specification verification, and performance tuning.
Diagnostic Focus:
Primarily focused on known specifications rather than diagnostic procedures.
Digital Format:
PDF (if digital); High-quality scans for print
Print Quality:
Professional printing standards, clear diagrams and text.
Binding:
Stapled, perfect bound, or coil bound (depending on format).
Paper Type:
Durable, high-quality paper suitable for workshop use.
Engine Types:
Range of single-cylinder (e.g., 250cc, 350cc, 500cc) and parallel-twin cylinder engines (e.g., 500cc, 600cc, 650cc).
Power Output:
Typically ranges from 15 bhp for smaller singles to over 40 bhp for larger twins, model dependent.
Torque Figures:
Varies by displacement and tuning, crucial for understanding engine character.
Carburetor Models:
Examples include Amal Monobloc, Amal Concentric, and sometimes specialized racing carbs for performance variants.
Jetting Specifications:
Detailed main jet, pilot jet, needle taper, and air/fuel mixture screw settings provided for various models and conditions.
Oil Type:
Typically SAE 20W/50 or 20W/40 motorcycle-specific oil. Some older models might use different viscosities.
Oil Capacity:
Engine oil capacity varies by model, typically 2-4 pints (approx. 1-2 liters).
Gearbox Type:
Often 4-speed or 5-speed constant mesh gearboxes, with pre-unit or unit construction.
Gear Ratios:
Specific gear ratios for each gear are detailed, critical for performance tuning.
Clutch Type:
Multi-plate wet clutch is standard on most models.
Final Drive:
Chain drive with specific sprocket ratios (front and rear) provided.
Wheelbase:
Varies by model, generally in the range of 53-57 inches (approx. 1350-1450 mm).
Seat Height:
Model-dependent, influencing rider accessibility.
Dry Weight:
Typically between 300-450 lbs (approx. 135-205 kg) depending on model size and configuration.
Fuel Capacity:
Fuel tank capacity ranges from approximately 3 to 5 gallons (approx. 11-19 liters).
Crash Test Data:
Not applicable for this era of motorcycles in the modern sense.
Braking Performance:
Specifications for brake components dictate stopping capability, which can be enhanced with modern upgrades.
Lighting Systems:
Details on dynamo/alternator output and wattage for headlamp, taillight, and indicators are provided.
Oil Change Interval:
Typically every 1,000 - 2,000 miles or annually, depending on usage and model.
Valve Clearance Adjustment:
Recommended at significant mileage intervals (e.g., 3,000-5,000 miles) or if engine noise is present.
Spark Plug Replacement:
As per ignition system recommendations, typically every 3,000-6,000 miles.
Engine Oil Spec:
SAE 20W/50 or 20W/40 motorcycle-specific oil. Check manual for exact recommendation.
Gearbox Oil Spec:
Often a heavier grade oil like SAE 75W/90 or 90 GL-4, depending on gearbox design (pre-unit vs. unit).
Brake Fluid Spec:
DOT 3 or DOT 4 for models equipped with hydraulic brakes (later models).
Valve Seat Wear:
Common in older engines, requiring attention for lead-free fuel compatibility.
Electrical Reliability:
Original wiring and charging systems can be prone to wear and failure, often requiring upgrades.
Gearbox Dog Wear:
Can lead to jumping out of gear, especially on high-mileage or hard-ridden machines.
Carburetor Tuning:
Amal carburetors require regular tuning and can be sensitive to atmospheric conditions.
A J Stevens:
AJS (A. J. Stevens) was a British motorcycle manufacturer founded in 1909. Known for sporting and racing success.
Associated Motorcycles:
AMC (Associated Motorcycles) was a conglomerate that owned AJS, Matchless, and other brands, merging operations in the mid-20th century.
Key Models:
Includes data for models like the AJS Model 18, CSR, Stormer, and various AMC models derived from shared components.
Engine Development:
Tracks the evolution from early JAP engines to proprietary AJS/AMC designs, including OHV and OHC configurations.
Manufacturing Period:
Covers production primarily from the 1930s through the 1960s, with some overlap and variations.
Racing Heritage:
AJS and AMC bikes achieved significant success in various racing disciplines, including Isle of Man TT and scrambles, demonstrating their engineering prowess.
Build Quality Perception:
Generally perceived as robust and well-built for their era, though subject to the typical wear and tear of vintage machinery.
