Segment:
Off-road competition motorcycles (Motocross/Enduro variants)
Target Audience:
Husqvarna CR 125 and WR 125 owners, mechanics, and enthusiasts performing maintenance, repairs, and diagnostics.
Competitors:
KTM 125 SX/EXC, Yamaha YZ125, Honda CR125R, Suzuki RM125, Kawasaki KX125.
Vehicle Focus:
Lightweight, agile, and powerful 125cc two-stroke off-road motorcycles known for performance in their respective disciplines (CR for Motocross, WR for Enduro).
Manual Value Proposition:
Provides OEM-level technical data, repair procedures, and troubleshooting guidance, crucial for maintaining and restoring these specialized machines.
Engine:
Complete engine overhaul, top-end rebuild (cylinder, piston, head), bottom-end rebuild (crankshaft, connecting rod, bearings), valve timing, lubrication system, cooling system (if applicable to specific model variant).
Transmission:
Gearbox disassembly and reassembly, clutch operation and adjustment, gear selection mechanism, lubrication.
Chassis And Suspension:
Front fork service (oil changes, seal replacement, disassembly), rear shock absorber service, swingarm removal and installation, linkage maintenance, steering head bearing service.
Brakes:
Hydraulic brake system diagnosis and repair, caliper service, master cylinder overhaul, bleeding procedures, pad and rotor replacement.
Electrical System:
Wiring diagrams, component testing (ignition, stator, rectifier/regulator, lighting), battery maintenance, troubleshooting common electrical faults.
Fuel System:
Carburetor disassembly, cleaning, and adjustment (e.g., Mikuni VM series common on these models), fuel tank maintenance, fuel line inspection.
Cooling System:
Radiator inspection and cleaning, coolant replacement procedures, thermostat testing (if equipped).
Exhaust System:
Exhaust pipe removal and installation, silencer packing replacement (if applicable).
Bodywork And Trim:
Fairing removal and installation, seat maintenance, fender inspection.
Maintenance:
Routine checks, lubrication points, filter replacements, spark plug replacement, chain adjustment, pre-ride inspections.
Troubleshooting:
Diagnostic flowcharts for common performance issues, starting problems, electrical faults, and mechanical noises.
Repair:
Step-by-step instructions for component disassembly, repair, and reassembly for all major vehicle systems.
Specifications:
Torque specifications for critical fasteners, engine clearances, fluid capacities, electrical resistance values.
Assembly Disassembly:
Detailed illustrations and instructions for taking apart and putting back together all major components and systems.
Depth:
Comprehensive from basic owner maintenance to complete engine and gearbox rebuilds. Includes detailed diagnostic procedures.
Engine Type:
Liquid-cooled, two-stroke, single-cylinder
Displacement:
124.8 cc (approximately)
Bore X Stroke:
Typically 54.0 mm x 54.5 mm (verify with manual for exact spec)
Compression Ratio:
Around 8.5:1 to 9.0:1 (verify with manual)
Cylinder Head:
Desmodromic valve system (common in some Husqvarna models of this era, but 2-stroke typically has port timing, not valves. Clarification needed from actual manual, but two-stroke power valve is a key feature).
Power Valve System:
HPP (Husqvarna Power Port) or similar electronically or mechanically controlled exhaust port timing system for improved low-end and mid-range power delivery.
Horsepower Estimate:
Approx. 30-35 HP at the crankshaft (estimated, peak power varies with tuning and model variant)
Torque Estimate:
Approx. 20-23 Nm (estimated)
Carburetor:
Mikuni VM38 or similar 38mm flat-slide carburetor (common specification).
Fuel Type:
Unleaded gasoline with appropriate two-stroke oil pre-mix (e.g., 50:1 or 40:1 ratio depending on oil quality and engine condition).
Ignition System:
Digital CDI (Capacitor Discharge Ignition)
Lubrication Type:
Pre-mix in fuel tank OR separate oil injection system (verify which system this specific manual covers).
Transmission Type:
6-speed constant mesh
Clutch Type:
Wet, multi-plate, cable-actuated
Gear Ratios:
Specific gear ratios will be detailed in the manual, critical for performance tuning.
Final Drive:
Chain drive (typically 520 or 525 pitch, number of teeth on sprockets varies for gearing).
Safety Certification:
N/A (Off-road competition vehicles not typically subject to road safety certifications)
Braking System:
Hydraulic disc brakes front and rear. Specific caliper and rotor sizes detailed in manual.
Suspension System:
Upside-down telescopic front forks (e.g., Marzocchi, WP) and single shock absorber rear linkage system with adjustable preload and damping.
Frame Construction:
Chromoly steel perimeter frame (typical for Husqvarna off-road bikes).
Oil Change Engine:
Premix fuel: No specific oil change interval, relies on correct fuel/oil mixture. Gearbox oil: Check and change as per manual, typically every 15-25 hours of use.
Air Filter Cleaning:
After every ride or as conditions dictate, especially in dusty environments.
Spark Plug Replacement:
Typically every 20-40 hours of use, depending on plug type and riding conditions.
Top End Rebuild:
Piston and ring replacement typically recommended between 40-80 hours of use for aggressive riding, or based on compression testing.
Gearbox Oil:
API GL-4 or GL-5, SAE 75W/90 or 10W/40 transmission oil (verify exact viscosity and type in manual).
Coolant:
Ethylene glycol-based antifreeze with corrosion inhibitors, mixed 50/50 with distilled water. Specific type and capacity in manual.
Brake Fluid:
DOT 4 hydraulic brake fluid (verify in manual, crucial for hydraulic systems).
Fork Oil:
Specific viscosity (e.g., 5W, 7.5W, 10W) and volume per fork leg. Manual will specify exact type and amount.
Two Stroke Wear:
As with all high-performance two-strokes, regular maintenance of the top-end (piston, rings, cylinder) is critical to prevent power loss and potential catastrophic failure.
Power Valve Maintenance:
Carbon buildup in the power valve mechanism can lead to sticky operation and reduced performance; requires periodic cleaning.
Clutch Wear:
Clutch plates can wear over time, requiring adjustment or replacement, especially with aggressive use.
Carburetor Tuning:
Carburetors can require re-jetting or adjustment based on altitude, temperature, and modifications.
Brand Origin:
Swedish, founded in 1689 (originally for firearms), motorcycle production began in 1903.
Cr Wr Lineage:
The CR (Competition/Motocross) and WR (Enduro) lines are long-standing Husqvarna models, evolving with engine technology, suspension, and chassis design over decades.
2007 Updates:
Likely received refinements to suspension settings, minor engine tuning updates, and cosmetic changes over the previous year.
Manufacturing Location:
Historically Sweden, though ownership changes have led to shifts in manufacturing. For 2007, likely still European production.
