Segment:
Motocross/Off-Road Competition
Target Audience:
Motocross racers, mechanics, and enthusiasts
Competitors:
KTM 125 SX, Yamaha YZ125, Honda CR125R (previous generations), Suzuki RM125 (previous generations)
Vehicle Focus:
Lightweight, agile, powerful 125cc two-stroke engine for racing
Manual Value:
Essential for maintaining peak performance and longevity of a competition bike
Engine:
Complete engine assembly, disassembly, and overhaul
Transmission:
Gearbox, clutch, and shift mechanism
Cooling System:
Radiator, water pump, hoses, and thermostat
Fuel System:
Carburetor, fuel lines, and fuel tank
Ignition System:
Spark plug, ignition coil, and stator
Exhaust System:
Exhaust pipe, muffler, and power valve
Suspension Front:
Fork assembly, seals, and damping adjustments
Suspension Rear:
Shock absorber, linkages, and bearings
Brakes Front:
Brake caliper, master cylinder, rotor, and lines
Brakes Rear:
Brake caliper, master cylinder, rotor, and lines
Wheels Tires:
Wheel bearing replacement, tire mounting
Electrical System:
Wiring diagrams, lighting, kill switch
Frame Chassis:
Frame inspection, swingarm, steering head
Bodywork Plastics:
Fairings, seat, fenders
Maintenance:
Regular servicing, filter replacement, chain adjustment
Troubleshooting:
Diagnostic procedures for common and uncommon issues
Repair:
Step-by-step repair instructions for all major components
Rebuilds:
Complete engine and suspension rebuild procedures
Diagnostics:
Identification of symptoms and corresponding fault causes
Torque Specifications:
Detailed torque settings for all critical fasteners
Depth:
Comprehensive, from basic adjustments to complete engine overhauls
Detail Level:
Factory-level technical detail with diagrams and illustrations
Type:
Liquid-cooled, 2-stroke, single-cylinder
Bore X Stroke:
54.0 mm x 54.5 mm
Compression Ratio:
8.8:1 (nominal)
Carburetor:
Keihin PWK 38 (typical specification)
Power Valve:
Mechanical power valve system (HPP)
Horsepower:
~36-38 hp (estimated at crankshaft)
Torque:
~26-28 Nm (estimated)
Fuel Type:
Unleaded gasoline (95-98 RON recommended)
Fuel Mix:
2% 2-stroke synthetic oil (e.g., Motorex Cross Power 2T)
Fuel Tank Capacity:
7.5 Liters (approx.)
Cooling System Type:
Liquid Cooling
Coolant Type:
Ethylene Glycol based antifreeze (50/50 mix with distilled water)
Type:
6-speed constant mesh
Clutch:
Wet multi-plate, hydraulically operated
Gear Ratios:
Specific gear ratios detailed in manual
Final Drive:
Chain drive (520 pitch)
Transmission Oil Type:
SAE 75W/80 or 10W/40 Motorcycle Gear Oil (refer to manual for specific grade)
Transmission Oil Capacity:
Approx. 0.8 - 1.0 Liters
Crash Safety:
N/A (Competition Off-Road Vehicle)
Brakes:
Hydraulic disc brakes front and rear
Throttle Control:
Standard twist throttle with safety stop
Frame Construction:
High-strength steel or chromoly frame
Handguards:
Often fitted as standard or aftermarket for rider protection
Oil Change Transmission:
Every 10-15 hours of riding, or as specified in the manual.
Air Filter Cleaning:
After every few rides or more frequently in dusty conditions.
Spark Plug Replacement:
Every 20-30 hours of riding, depending on plug type and usage.
Top End Rebuild:
Recommended every 40-60 hours of hard use (piston, rings, cylinder inspection).
Chain And Sprockets:
Regular cleaning, lubrication, and tension adjustment; replacement as needed.
Fork Oil:
Refer to manual for specific type (e.g., Motorex Fork Oil 5W, 7.5W) and quantity.
Coolant:
50/50 mix of ethylene glycol antifreeze and distilled water.
Carburetor Tuning:
Sensitivity to altitude and temperature changes requires proper jetting.
Clutch Wear:
Clutch plates can wear faster with aggressive riding, requiring regular inspection and replacement.
Power Valve Sticking:
Carbon buildup can cause the power valve to stick, affecting engine performance; requires periodic cleaning.
Suspension Seals:
Fork and shock seals can be prone to leaks, especially under demanding off-road conditions.
Heritage:
Husqvarna is one of the oldest motorcycle manufacturers, with a strong lineage in off-road competition.
Cr125 Lineage:
The CR125 has been a significant model in Husqvarna's motocross history, evolving through many generations with performance enhancements.
Production Era:
Husqvarna motorcycles have been produced in Sweden and later Italy (under various ownerships, including BMW and Pierer Mobility AG).
Model Specifics 2012:
The 2012 model represents a refinement of the platform, incorporating updates based on previous racing feedback.
