Market Position:
Lightweight, agile supermoto aimed at urban riding and spirited performance.
Competitors:
Yamaha DT125X, Aprilia SX125, KTM 125 EXC Supermoto conversion.
Key Features:
Compact 125cc two-stroke engine, agile chassis, powerful braking for its class, distinctive supermoto styling.
Target Audience:
Beginner to intermediate riders, urban commuters, those seeking a fun, accessible supermoto experience.
Manual Value Proposition:
Provides essential technical knowledge for self-maintenance and repair, reducing reliance on costly dealership services.
Engine:
Complete engine disassembly, assembly, troubleshooting, and repair
Fuel System:
Carburetor system, fuel lines, fuel tank, and related components
Cooling System:
Radiator, coolant hoses, thermostat, and fan operation
Ignition System:
Ignition coil, spark plug, CDI unit, and wiring
Transmission Drivetrain:
Gearbox inspection, repair, clutch service, and final drive maintenance
Suspension:
Front forks (oil type, level, seal replacement), rear shock absorber, linkage systems
Brakes:
Front and rear brake systems, caliper service, pad replacement, fluid flush, hydraulic lines
Electrical System:
Wiring diagrams, battery service, lighting, starter motor, charging system
Chassis Frame:
Frame inspection, steering head bearing service
Bodywork:
Fairings, seat, fuel tank cover removal and installation
Maintenance:
Regular servicing, lubrication, filter changes, fluid checks
Troubleshooting:
Diagnostic charts and procedures for common problems
Repair:
Detailed step-by-step instructions for all components and systems
Disassembly Assembly:
Exploded views and instructions for component removal and reinstallation
Adjustments:
Carburetor tuning, chain slack adjustment, clutch and brake lever adjustments
Overhauls:
Complete engine and gearbox rebuild procedures
Technical Depth:
Comprehensive, from basic maintenance to complete engine rebuilds
File Format:
PDF (Portable Document Format)
Searchability:
Likely text-searchable PDF
Print Quality:
Designed for clear printing of text and diagrams
Binding Type:
N/A (Digital Download)
Paper Type:
N/A (Digital Download)
Operating Systems:
Windows (95, 98, 2000, NT, XP, Vista, 7, 8), Mac OS
Engine Type:
Liquid-cooled, two-stroke, single-cylinder
Bore X Stroke:
54 mm x 54.5 mm (typical for this era 125cc Husqvarna 2-stroke)
Compression Ratio:
Approx. 8.0:1 to 8.5:1 (may vary slightly by specific market version)
Carburetor:
Mikuni VM28 (common for this model)
Horsepower:
Approximately 15-20 HP (depending on model year and emissions tuning)
Torque:
Not specifically detailed, but adequate for class performance.
Fuel Type:
Unleaded gasoline (RON 95 recommended)
Fuel Mixture:
Pre-mix oil/fuel or automatic oil injection system (check specific model variant)
Fuel Tank Capacity:
Approx. 9-10 Liters
Safety Ratings:
Not applicable to motorcycles in the same way as cars.
Active Safety Features:
Responsive braking system, agile handling, good visibility.
Passive Safety Features:
Robust frame construction, standard handguards.
Oil Change Interval:
Every 3,000 km or 12 months (typical for 2-stroke).
Spark Plug Replacement:
Every 5,000-8,000 km (depending on plug type and usage).
Air Filter Cleaning:
Every 1,500-3,000 km, depending on riding conditions.
Top End Rebuild:
Recommended every 15,000-20,000 km for optimal performance in 2-stroke engines.
Engine Oil Type:
High-quality 2-stroke premix oil (JASO FD or TCW3 rated).
Gearbox Oil Type:
API GL-3 or GL-4, SAE 80W/90 hypoid gear oil.
Coolant Type:
Ethylene glycol-based antifreeze coolant (50% mixture with distilled water).
Brake Fluid Type:
DOT 4 brake fluid.
Known Issues:
Potential for carburetor jetting issues if not properly maintained, occasional clutch wear with hard use, typical 2-stroke wear on piston and rings over extended mileage.
Common Repairs:
Piston ring replacement, exhaust port cleaning, carburetor cleaning and adjustment, fork seal replacement.
Brand Heritage:
Husqvarna Motorcycles has a long and rich history dating back to 1903, renowned for its off-road prowess.
Model Evolution:
The SM 125 S is part of Husqvarna's expansion into the supermoto segment, building on their dirt bike expertise. This generation represents a key period for the brand under BMW ownership.
Production Period:
The SM 125 S model was produced for several years in the early 2000s, with this manual covering a specific early period.
