Segment:
Lightweight off-road/supermoto motorcycles
Competitors:
KTM 125 EXC, Yamaha WR125, Honda CRF150/250, Suzuki RM-Z125
Versatility:
Designed for both off-road (WRE125) and street-legal supermoto (SM125S) applications, offering dual-purpose capability.
Engine Type:
Robust liquid-cooled, two-stroke single-cylinder engine known for its simplicity and power delivery in its class.
Manual Value:
Essential for owners and mechanics to maintain performance, reliability, and safety of these specialized motorcycles.
Engine Mechanical:
Full overhaul, inspection, adjustment, repair (cylinder head, piston, connecting rod, crankshaft, valve train, etc.)
Fuel System:
Carburetor system (cleaning, adjustment, jetting, float level), fuel pump, fuel lines
Ignition System:
CDI unit, ignition coil, spark plug, timing specifications
Cooling System:
Radiator, coolant flow, thermostat (if applicable)
Exhaust System:
Muffler, exhaust pipe, leak checks
Transmission Drivetrain:
Clutch operation, gear shifting mechanism, chain and sprockets maintenance, gearbox internal inspection and repair
Chassis Frame:
Frame inspection, headstock bearings, swingarm pivot
Suspension:
Front forks (oil change, seal replacement, spring preload), rear shock absorber (adjustment, linkage maintenance)
Braking System:
Front and rear brake systems (caliper service, pad replacement, fluid flush, hose inspection), master cylinders
Wheel Tire:
Wheel bearing inspection, spoke tensioning (if applicable), tire pressure recommendations
Electrical System:
Wiring diagrams, battery maintenance, lighting systems, starter motor, charging system (stator, rectifier/regulator)
Bodywork Trim:
Fairing removal/installation, seat, fenders
Routine Maintenance:
Oil changes, filter replacement, spark plug inspection/replacement, chain adjustment, air filter cleaning/replacement
Diagnostic Troubleshooting:
Step-by-step guides for identifying and resolving common operational issues
Component Overhaul:
Detailed instructions for complete disassembly, cleaning, inspection, repair, and reassembly of major components
Adjustments:
Carburetor tuning, clutch adjustment, chain tension, suspension settings
Fluid Service:
Brake fluid bleeding and replacement, coolant flush, gearbox oil change
Electrical Troubleshooting:
Wiring diagrams, voltage/resistance checks for electrical components
Tire Wheel Service:
Tire mounting/dismounting, wheel balancing (if applicable), spoke truing
Depth:
Comprehensive: Covers everything from basic maintenance to complete engine and chassis rebuilds. Includes detailed specifications and diagnostic procedures.
Diagnostics:
Advanced troubleshooting with specific checks and likely causes for issues
Rebuilds:
Full rebuild procedures for engine, gearbox, and suspension components
Illustrations:
Includes exploded views and diagrams for clear component identification and assembly
Type:
Liquid-cooled, two-stroke, single-cylinder
Displacement:
124.8 cc (approximately)
Bore X Stroke:
54.0 mm x 54.5 mm (typical for this class)
Compression Ratio:
Approx. 8.8:1 (typical for 2-stroke off-road)
Power Output:
Approx. 15-20 HP (depending on tuning and variant, specific figures not in product info)
Torque:
Not specified, but typically robust low-to-mid range for this engine type
Carburetor:
Mikuni VM28SS (typical for this model)
Fuel Type:
Unleaded gasoline, must be mixed with two-stroke oil
System:
Pre-mix or separate oil injection system (check specific model variant)
Engine Oil Change:
Typically every 10-15 hours of riding or annually, refer to manual for specifics.
Spark Plug Inspection:
Every 20-30 hours of riding, or as needed based on performance.
Air Filter Cleaning:
Regularly, especially after dusty riding conditions (e.g., every 5-10 hours).
Chain Lubrication Adjustment:
Every 500-1000 km, or more frequently in wet/dirty conditions.
Engine Oil:
API GL-4 or GL-5, SAE 80W/90 gear oil for gearbox (refer to manual for exact specification).
Brake Fluid:
DOT 4 hydraulic brake fluid.
Coolant:
Ethylene glycol-based coolant, mixed with distilled water (50/50 ratio typical).
Common Wear Items:
Clutch plates, piston rings, spark plugs, chain and sprockets, fork seals due to performance nature.
Carburetor Tuning:
May require periodic adjustment due to atmospheric changes or fuel variations.
