This workshop service repair manual provides comprehensive information for the 1990 WR 240-250-260, a line of performance-oriented off-road competition and enduro motorcycles. Renowned for its robust engineering and strong heritage in off-road racing, the WR series from this era offers exceptional capability. The 1990 models, representing a refined period for the brand, are designed for demanding terrain and competitive use, balancing power delivery with agile handling. This manual is an essential resource for owners and enthusiasts seeking to maintain the peak performance and longevity of these iconic Swedish-built machines. The scope of this English-language manual is extensive, covering all critical aspects of the WR series for owners, mechanics, and technicians. It details complete engine disassembly, assembly, and tuning for all variants, along with gearbox inspection and repair. Procedures for the front and rear suspension, brakes, electrical systems, fuel system, and chassis are thoroughly explained. Additionally, the manual includes guidance on regular maintenance, troubleshooting common issues, diagnostic procedures, and complete overhaul instructions, ensuring that every facet of the motorcycle can be properly understood and serviced. 🏷️ Basic Information Identification Make: Husqvarna Model: WR 240-250-260 Year: 1990 👋 Introduction Market Position Segment: Off-road competition/Enduro motorcycles Target Audience: Owners, mechanics, and enthusiasts of 1990 Husqvarna WR series motorcycles. Competitive Analysis Competitors 1990: KTM (e.g., 250 EXC), Yamaha (e.g., YZ250WR), Honda (e.g., CR250R), Suzuki (e.g., RM250). Key Features Model Focus: Performance-oriented off-road capability for the WR (Wide Range) series. Manual Advantage: Most complete OEM information for accurate maintenance and repair, crucial for vintage off-road bikes. 📋 Manual Details Coverage Areas Manual Type: Workshop Service Repair Manual Language: English Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Complete engine disassembly, assembly, tuning, and troubleshooting for all variants. Transmission: Gearbox inspection, repair, and maintenance procedures. Suspension: Front fork (upside-down telescopic, hydraulic) and rear shock absorber service, including adjustments and rebuilds. Brakes: Front and rear brake system maintenance, including caliper service, hydraulic line bleeding, and pad replacement. Electrical: Ignition system, lighting, wiring diagrams, and component troubleshooting. Fuel System: Carburetor identification, tuning, and rebuilding procedures. Cooling System: Air-cooled engine specifications and maintenance. Frame Chassis: Frame inspection, component mounting, and general chassis maintenance. Bodywork: Plastics, seat, and fuel tank maintenance and removal. Procedures Included Maintenance: Regular service checks, lubrication points, filter replacements, and fluid changes. Repair: Step-by-step instructions for common and complex repairs across all systems. Troubleshooting: Diagnostic tables and flowcharts for identifying and resolving common issues. Diagnostics: Identification of potential failures and methods for checking component functionality. Overhaul: Detailed procedures for complete engine and gearbox rebuilds. Technical Depth Level Of Detail: Comprehensive OEM-level technical information, suitable for professional mechanics and advanced DIY enthusiasts. 📊 Manual Specifications File Format Digital Format: PDF Searchability: Likely searchable text within the PDF for easy information retrieval. Printability: Printable pages for hands-on workshop use. Print Quality Clarity: High-resolution scans ensuring legibility of text and diagrams. Binding Type Binding For Download: N/A (Digital Download) Paper Type Paper For Download: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Type: Two-stroke, single-cylinder, liquid-cooled (typically, though air-cooled variants existed for some models/years - manual confirms specific cooling for 1990 WR) Bore X Stroke 240: 66.4 mm x 72 mm (approximate, to be confirmed by manual) Bore X Stroke 250: 67.7 mm x 72 mm (approximate, to be confirmed by manual) Bore X Stroke 260: 68 mm x 72 mm (approximate, to be confirmed by manual) Displacement 240: 238 cc (approximate, to be confirmed by manual) Displacement 250: 246 cc (approximate, to be confirmed by manual) Displacement 260: 250 cc (approximate, to be confirmed by manual) Performance Horsepower: Estimated 35-45 HP (dependent on specific model and tuning, manual provides exact figures) Torque: Manual provides specific torque figures for each displacement variant. Fuel System Carburetor Type: Likely Mikuni VM or equivalent, manual will specify exact model and jetting. Fuel Type: Premium unleaded gasoline with appropriate 2-stroke oil mixture (manual specifies ratio). Reed Valve System: Standard for performance two-strokes of this era; manual details inspection and replacement. 🔧 Transmission Standard Type: 6-speed manual transmission Optional Optional Gearboxes: N/A for this model year, standard 6-speed. Features Clutch Type: Wet, multi-plate, cable-actuated clutch. Gear Ratios: Manual provides specific gear ratios for each of the 6 speeds. Transmission Oil Spec: Manual specifies type and capacity (e.g., SAE 80W or 10W-40 motorcycle gear oil). 📐 Dimensions Exterior Wheelbase: Manual will provide specific wheelbase length for accurate geometry. Weights Dry Weight: Typically around 230-250 lbs (104-113 kg), manual confirms exact figure. Fuel Capacity: Approx. 2.5 - 3.0 gallons (9.5 - 11.4 liters), manual confirms exact capacity. Gross Vehicle Weight Rating: Manual will list the GVWR for safe operation. Wheels Tires Front Wheel Size: 21 inches Rear Wheel Size: 18 inches Front Tire Size: Manual specifies recommended sizes (e.g., 80/100-21). Rear Tire Size: Manual specifies recommended sizes (e.g., 100/100-18). 🛡️ Safety Features Ratings Safety Standards:...