Market Segment:
High-performance off-road motorcycles, popular in motocross and enduro disciplines during their production years.
Competitors:
Competed against models from KTM (e.g., EXC, SX series), Yamaha (e.g., YZ series), Honda (e.g., CR series), Suzuki (e.g., RM series), and Kawasaki (e.g., KX series) in the 250cc and 350cc off-road segments.
Brand Reputation:
Husqvarna, a historic Swedish motorcycle manufacturer known for its robust and capable off-road machines.
Model Design:
Typically featured powerful two-stroke engines, capable suspension, and durable chassis designed for demanding off-road conditions.
Value Proposition:
Essential resource for owners and mechanics to maintain, diagnose, and repair these performance-oriented motorcycles, ensuring longevity and optimal performance.
Engine Service:
Detailed disassembly, inspection, reassembly of engine components, cylinder head, piston, crankshaft, bearings, seals, lubrication system, cooling system (if applicable to specific models, though these are primarily air-cooled).
Transmission Service:
Gearbox disassembly, inspection, repair, clutch service (friction plates, steel plates, springs, mechanism), shift drum and forks.
Fuel System:
Carburetor service (disassembly, cleaning, adjustment, jetting), fuel tank, fuel lines, petcock.
Ignition System:
CDI unit, spark plug, ignition coil, timing specifications, stator/rotor inspection.
Suspension:
Front fork service (oil change, seal replacement, damper rod inspection), rear shock absorber service (if applicable, though most WR/CR models of this era were mono-shock).
Brakes:
Hydraulic brake system service (front and rear calipers, master cylinders, brake lines, brake fluid replacement, bleeding), brake pad replacement, rotor inspection.
Electrical System:
Wiring diagrams, lighting (headlight, taillight, brake light), switches, battery maintenance (if electric start models exist, though less common for these), fuse inspection.
Chassis And Frame:
Frame inspection, swingarm service, linkage maintenance (if applicable), steering head bearing service.
Cooling System:
Likely air-cooled, so focus on cylinder fin cleaning and airflow.
Wheels And Tires:
Wheel bearing service, spoke tensioning, tire removal/installation, recommended tire pressures.
Routine Maintenance:
Oil changes, filter cleaning/replacement, chain adjustment and lubrication, spark plug checks, air filter service, general inspection.
Troubleshooting:
Diagnostic guides for common performance issues, starting problems, running issues, and component failures.
Repair And Rebuild:
Complete step-by-step instructions for major component overhauls and replacements (e.g., engine rebuild, transmission overhaul, suspension rebuild).
Adjustments:
Carburetor tuning, clutch cable adjustment, brake lever adjustment, chain slack adjustment.
Disassembly And Reassembly:
Detailed procedures for taking apart and putting back together all major systems of the motorcycle, aided by exploded views.
Technical Depth:
Comprehensive, covering everything from basic maintenance to complete engine and transmission rebuilds, including detailed specifications and diagnostics.
Diagnostic Capability:
Provides specifications for measurements (e.g., piston-to-cylinder bore clearance, valve lash if applicable, compression test readings) and troubleshooting charts.
Illustrations And Diagrams
Illustrations:
Includes detailed illustrations, exploded views, and diagrams to clarify procedures and component identification.
Engine Type:
Two-Stroke, Single Cylinder
Bore Stroke Wr250:
Approximately 66.4 mm x 72.0 mm (typical for 249cc class, specific Husky specs to be confirmed in manual)
Bore Stroke Wr360:
Approximately 78.0 mm x 77.0 mm (typical for 359cc class, specific Husky specs to be confirmed in manual)
Bore Stroke Cr250:
Approximately 66.4 mm x 72.0 mm (typical for 249cc class, specific Husky specs to be confirmed in manual)
Cooling System:
Air-cooled
Horsepower Wr250:
Estimated 35-45 HP (peak, depending on tuning and specific model year)
Horsepower Wr360:
Estimated 40-50+ HP (peak, depending on tuning and specific model year)
Torque Characteristics:
Strong mid-range and top-end power delivery, characteristic of performance two-strokes.
Carburetor Size:
Typically a 36mm or 38mm Mikuni or Keihin carburetor (specific model dependent).
Fuel Type:
Unleaded gasoline with appropriate two-stroke oil pre-mix (e.g., 40:1 or 50:1 ratio, refer to manual for exact specification).
Transmission Oil Type:
Specialized gearbox oil for wet clutches (e.g., Motul 75W/80, or equivalent JASO MA certified oil - confirm in manual).
Oil Change Interval:
Gearbox oil typically recommended every 10-15 hours of riding or annually, refer to manual for specific mileage/hour recommendations.
Air Filter Cleaning:
Frequent cleaning recommended, especially in dusty conditions (e.g., every few rides).
Spark Plug Inspection:
Regular checks for fouling and proper gap, typically every 5-10 hours.
Chain Lubrication Adjustment:
Lubricate and adjust chain slack after every few rides or as needed based on wear.
Transmission Oil Capacity:
Approximately 0.7 - 0.8 liters (specific amount to be confirmed in manual).
Brake Fluid Type:
DOT 4 recommended for hydraulic brake systems (confirm in manual).
Coolant Type:
N/A (Air-cooled engines).
Common Wear Items:
Piston rings, clutch plates, wheel bearings, steering head bearings, fork seals, brake pads are common wear items on performance off-road bikes.
Carburetor Tuning:
Can be sensitive to altitude and temperature changes, requiring periodic adjustment for optimal performance.
Two Stroke Engine Maintenance:
Requires diligent attention to pre-mix ratios, spark plug maintenance, and periodic decarbonization of the exhaust port and piston crown.
Brand Origin:
Founded in Sweden in 1903, Husqvarna has a long and storied history in motorcycle manufacturing, particularly in off-road disciplines.
Model Lineage:
The WR (Wide Ratio) and CR (Competition Replica) lines represent Husqvarna's commitment to motocross and enduro racing, with continuous development and improvements across generations.
Production Period:
Models WR 250, WR 360, and CR 250 were produced through the early 2000s, with variations and updates occurring annually.
Manufacturing Location:
Historically manufactured in Sweden, though ownership has changed hands, influencing production locations over time (but for this era, likely Sweden).
