Welcome to the comprehensive workshop service repair manual for the 1987 Husqvarna WRK 125. This iconic off-road motorcycle, from the First Generation (MK I), is celebrated for its torquey 125cc two-stroke engine, long-travel suspension, and agile handling, making it a capable machine for motocross and enduro riding. Known for its robust construction and performance that rivaled contemporaries from other manufacturers, the WRK 125 embodies a rich heritage in off-road motorsport. Its design emphasizes tractable power delivery and maneuverability, ideal for challenging terrains and providing an engaging riding experience. This manual serves as an indispensable resource for owners, mechanics, and technicians, offering detailed guidance on all aspects of the WRK 125. It covers essential maintenance procedures, including fluid changes, lubrication, and component inspections, alongside in-depth troubleshooting guides for common issues. You will find thorough instructions for engine overhauls, carburetor tuning, suspension servicing, brake maintenance, and electrical system diagnostics, all presented with OEM-equivalent detail. With approximately 200-300 pages of high-resolution English content, this digital manual is designed to ensure your WRK 125 remains in optimal condition, facilitating both routine upkeep and complex repairs. 🏷️ Basic Information Identification Make: Husqvarna Model: WRK 125 Year: 1987 Generation Generation Designation: First Generation (MK I) 👋 Introduction Market Position Category: Off-road, Motocross/Enduro (Lightweight Class) Competitive Analysis Competitors: Competed against models like KTM 125 EXC, Yamaha YZ125, Suzuki RM125, Honda CR125R of the era. Key Features Engine Type: Torquey 125cc 2-stroke, liquid-cooled (check specific model variant, some may be air-cooled, but WRK usually implies water-cooled) Suspension: Long-travel suspension for off-road capability, typically featuring adjustable front forks and a monoshock rear. Handling: Known for agile handling and maneuverability in technical terrain. Performance: Emphasis on tractable power delivery suitable for trail riding and entry-level motocross. 📋 Manual Details Coverage Areas Engine: Complete engine overhaul, internal components, cooling system, lubrication system Transmission: Gearbox operation, clutch assembly, shift mechanism, lubrication Chassis: Frame, suspension (front forks, rear shock absorber), steering, wheels, hubs Brakes: Front and rear brake system servicing, hydraulic components, pad/shoe replacement Electrical: Ignition system, lighting, charging system, wiring diagrams, battery maintenance Fuel System: Carburetor tuning and overhaul, fuel tank, fuel lines, fuel pump (if applicable) Exhaust System: Exhaust pipe and silencer maintenance Bodywork: Body panels, seat, fenders, graphics Maintenance: Scheduled maintenance, fluid changes, lubrication points Troubleshooting: Diagnostic procedures for common issues Page Count Estimated Pages: ~200-300 Manual Type Type: Workshop Service Repair Manual (OEM Equivalent) Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine System: Detailed breakdown of the 125cc 2-stroke engine, including cylinder, piston, crankshaft, connecting rod, seals, and gaskets. Specific torque values for critical fasteners. Cooling System: Air cooling system analysis, fin cleaning, and general condition checks. Lubrication System: 2-stroke oil/fuel mixture recommendations, gearbox oil specifications and change intervals. Transmission System: 6-speed gearbox service, clutch operation and adjustment, shift lever linkage. Fuel Delivery System: Dell'Orto PHBH carburetor specifications, jetting, float level adjustment, and cleaning procedures. Fuel filter inspection. Ignition System: CDI ignition timing, spark plug specifications (type, gap), and coil testing. Suspension System: Front telescopic forks (oil type, level, seal replacement), rear monoshock (pre-load adjustment, damping characteristics). Braking System: Front disc brake caliper and master cylinder service, rear drum brake adjustment and shoe replacement. Hydraulic fluid type (DOT 3/4). Electrical System: Wiring diagrams for all electrical components, including lighting, horn, and kill switch. Battery specifications and charging system diagnosis. Procedures Included Engine Rebuild: Complete engine disassembly, cleaning, inspection, and reassembly with replacement part recommendations. Carburetor Tuning: Step-by-step guide for adjusting air-fuel mixture, idle speed, and throttle response. Suspension Servicing: Fork seal replacement, fork oil change, rear shock absorber adjustments. Brake Maintenance: Brake fluid bleeding, pad/shoe replacement, caliper/drum servicing. Electrical Diagnostics: Troubleshooting common electrical faults using wiring diagrams and multimeter testing. Wheel And Tire Service: Tire pressure recommendations, wheel bearing maintenance, spoke tensioning (if applicable). Cleaning And Lubrication: Points for regular cleaning and lubrication of moving parts. Troubleshooting Guides: Problem-solution tables for ignition, fuel, starting, and running issues. Technical Depth Depth: Comprehensive OEM-level detail for DIY repairs, professional mechanics, and in-depth understanding of the machine. 📊 Manual Specifications File Format Format: PDF (Portable Document Format) Searchable Text: Yes (typically, depending on the scan quality) Print Quality Quality: High-resolution scans for clear text and diagrams Binding Type Type: Digital Download (Not a physical product) Paper Type Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: Two-stroke, single-cylinder Displacement: 123.5 cc (approx.) Bore X Stroke: 54 mm x 54 mm (typical for this era and displacement) Cooling System: Liquid-cooled Carburetor Model: Dell'Orto PHBH 28 AS (common fitment) Ignition: CDI (Capacitor Discharge Ignition) Compression Ratio: Typically around 7.0:1 to 8.0:1 (check manual for exact spec) Performance Horsepower: Approx. 25-30 HP (estimate, actual may vary) Torque: Not typically quoted for this class, but focused on mid-range pull. Fuel System Fuel Type: Unleaded gasoline with 2-stroke engine oil mix...