🏷️ Basic Information Identification Make: AJS Model: K7 & K10 Year: 1928 Codes Product Code: N/A Generation Generation Identifier: Pre-War British Motorcycle 👋 Introduction Market Position Historical Context: Represents a crucial period in British motorcycle development, with AJS being a prominent manufacturer known for its sporting and reliable machines. Competitive Analysis Competitors: Models from BSA, Triumph, Norton, and Matchless of the same era. Key Features Vehicle Key Features: Overhead chain-driven camshaft engine (advanced for its time), solid construction, and robust performance characteristic of AJS engineering. 📋 Manual Details Coverage Areas Areas Covered: Engine (Overhead Chain Driven Camshaft), Lubrication, Decarbonizing, Valve Clearance Page Count Page Count: 7 Manual Type Manual Type: Instruction Manual Language Language: English Format File Format: PDF SCAN 📖 Manual Coverage Systems Covered Engine Systems: Overhead chain driven camshaft operation, lubrication systems, decarbonizing procedures, valve clearance adjustment. Procedures Included Maintenance Procedures: General maintenance, engine decarbonizing, lubrication system servicing, valve adjustment. Technical Depth Technical Depth: Covers essential operational and maintenance aspects for technicians and owners of the era, focusing on key engine functionalities. 📊 Manual Specifications File Format Digital Format: PDF Print Quality Scan Quality: Scanned document, quality dependent on original source and scanning process. Likely suitable for screen viewing and targeted printing. Binding Type Binding Type: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Configuration: Overhead Chain Driven Camshaft (OHC) Engine Type: Internal Combustion, likely 4-stroke Performance Horsepower Estimation: Typical for the era, likely in the 15-25 hp range depending on specific engine variant and tune. Torque Estimation: Estimated based on displacement and engine design; specific figures are rare for this period. Fuel System Carburation: Likely single carburetor (e.g., Amac, Villiers, or proprietary AJS). Fuel Type: Petrol (Gasoline), likely leaded. Lubrication Lubrication System: Total Loss or early recirculating oil system, with oil fed to the engine, gearbox, and primary chain case. Engine Codes Engine Displacement Estimation: K7 and K10 likely refer to different engine displacements or tuning variants. Common AJS displacements in the late 1920s ranged from 250cc to 500cc, often 350cc or 500cc overhead valve or pushrod engines. The OHC configuration suggests performance-oriented models. 🔧 Transmission Standard Transmission Type: Manual, likely 3 or 4-speed gearbox. Optional Clutch Type: Dry plate or multi-plate clutch, operated by hand lever. Features Gear Selection: Hand-operated gear change mechanism, possibly foot pedal in later iterations. Lubrication Gearbox Oil Specification: Typically SAE 30 or SAE 50 motor oil, depending on ambient temperature and manufacturer recommendation. Shared lubrication with primary chain case is common. 📐 Dimensions Exterior Wheelbase Estimation: Typical for motorcycles of the era, around 55-60 inches (1400-1525 mm). Weights Dry Weight Estimation: Likely in the range of 300-400 lbs (135-180 kg) depending on model and equipment. 🛡️ Safety Features Ratings Safety Standards Era: Safety standards were rudimentary compared to modern vehicles. Emphasis was on mechanical reliability and rider skill. Active Features Braking System: Drum brakes (likely both front and rear), operated by cables or rods. Performance would be limited by materials and design of the era. Passive Features Lighting: Typically a basic headlamp (often acetylene or early electric), and possibly a tail lamp. Magneto ignition often provided current for the headlamp. 💡 Technology Features Infotainment Infotainment Features: N/A (Mechanical motorcycle of the 1920s) Driver Assistance Driver Assistance Systems: N/A (Mechanical motorcycle of the 1920s) Connectivity Connectivity Features: N/A (Mechanical motorcycle of the 1920s) Ignition System Ignition Type: Magneto ignition, providing a self-contained high-voltage spark without a battery. Electrical System Electrical Components: Basic electrical system for lighting, driven by the magneto's dynamo output or separate dynamo on some models. Likely 6-volt system if electric lighting was fitted. 🔧 Maintenance Service Intervals Decoking Interval: Historically, decarbonizing might have been recommended every 3,000-5,000 miles, or when performance degradation was noticed. Lubrication Interval: Regular checks and replenishment of oil in the engine and gearbox were crucial, often done before long journeys. Fluid Specifications Engine Oil Specification: Typically SAE 30 or SAE 50 monograde mineral oil for the engine and gearbox. Modern alternatives should be carefully selected for compatibility with older seal materials. Gearbox Oil Capacity: Capacity would be specific to the gearbox, likely around 0.5-1 liter. Known Issues Common Wear Items: Valve guides and seats, piston rings, camshaft chain wear, clutch plate wear, gearbox lubrication breakdown due to early oil formulations and potential leaks. Maintenance Challenges: Sourcing original or high-quality replacement parts can be difficult. Ignition timing and carburetor tuning require specialized knowledge of pre-war engines. Parts Replacement Spark Plug Specification: Thread size and heat range would be specific to the period, likely a metric thread (e.g., 14mm) with a suitable heat range for the engine's operating conditions. Camshaft Chain Tensioner: Manual adjustment of the camshaft chain tensioner would be a critical maintenance procedure covered. 📚 Vehicle History Brand Heritage Manufacturer History: A.J. Stevens & Co. Ltd. (AJS)...