Engine Mechanical:
Complete engine disassembly, assembly, overhaul, piston, rings, cylinder, crankshaft, connecting rod, bearings, cylinder head, valves, camshafts, timing.
Engine Fuel System:
Carburetor service, adjustments, jetting, fuel lines, fuel tank maintenance, fuel pump (if applicable).
Ignition System:
Spark plugs, ignition timing, coil, CDI unit, wiring diagrams.
Cooling System:
Radiator service, coolant, water pump, hoses, thermostat.
Exhaust System:
Exhaust pipe, muffler, cleaning, and inspection.
Transmission Gearbox:
Gearbox disassembly, assembly, inspection, gear selection, clutch operation, maintenance.
Clutch:
Clutch plate wear, operation, adjustment, hydraulic or cable system service.
Suspension Front:
Front fork service, oil change, seal replacement, spring inspection, adjustment.
Suspension Rear:
Rear shock absorber service, linkage inspection, adjustment, bearings.
Brakes Front:
Brake caliper service, pad replacement, fluid flush, master cylinder, brake lines.
Wheels Tires:
Wheel bearing maintenance, tire pressure, tire replacement, spoke tensioning.
Electrical System:
Wiring diagrams, battery maintenance, lighting, charging system, starter, switches, fuses.
Frame Chassis:
Frame inspection, steering head bearings, swingarm bearings, maintenance.
Bodywork Plastics:
Fairing, fenders, seat maintenance, removal, and installation.
Rear Brake:
Brake caliper service, pad replacement, fluid flush, master cylinder, brake lines.
Routine Maintenance:
Oil changes, filter replacement, chain adjustment, lubrication, inspection of wear items.
Troubleshooting:
Diagnosis of common problems, fault finding based on symptoms.
Repair Procedures:
Step-by-step instructions for component removal, repair, and reinstallation.
Engine Rebuild:
Detailed guidance for full engine overhauls and component replacements.
Suspension Setup:
Guidance on suspension adjustments for different riding conditions.
Electrical Diagnostics:
Using wiring diagrams for fault finding and repair.
Depth:
Comprehensive, covering full rebuilds, advanced diagnostics, and detailed specifications.
Type:
2-stroke, liquid-cooled, single-cylinder
Displacement:
124 cc (approximate, based on model name)
Bore X Stroke:
Likely around 54mm x 54.5mm (typical for 125cc 2-strokes of this era)
Compression Ratio:
Likely around 8.5:1 - 9.5:1
Power Output:
Around 30-35 HP (estimated, exact figures vary with tuning)
Torque:
Around 18-20 Nm (estimated)
Carburetor:
Likely a Mikuni VM or TMX series carburetor, e.g., 34mm or 36mm
Fuel Type:
Unleaded gasoline with 2-stroke oil pre-mix (specific ratio required, e.g., 32:1 or 40:1)
Ignition Type:
CDI (Capacitor Discharge Ignition)
Coolant Type:
Ethylene glycol based coolant, 50/50 mix with distilled water
Oil Change Engine:
2-stroke, requires regular pre-mix; gearbox oil change every 15-20 hours of riding or annually.
Spark Plug Inspection:
Check and clean or replace every 10-15 hours of riding, depending on usage and plug type.
Air Filter Cleaning:
Clean or replace frequently, often after every few riding sessions, especially in dusty conditions.
Chain Lubrication Adjustment:
Lubricate after every wash or every 500 km; check and adjust tension regularly (15-25mm slack).
Engine Oil Premix:
High-quality 2-stroke synthetic or semi-synthetic oil (e.g., Motul 800, Castrol TTS, Yamalube 2T); Ratio: 32:1 or 40:1 (refer to manual for precise specification).
Gearbox Oil:
SAE 75W-90 or SAE 80W-90 API GL-4 transmission oil (Capacity approx. 0.6-0.8 liters).
Coolant:
50% Ethylene Glycol and 50% Distilled Water.
Power Valve Sticking:
The exhaust power valve can accumulate carbon and stick, affecting performance; requires periodic cleaning.
Clutch Wear:
Clutch plates may wear relatively quickly under aggressive off-road use; regular inspection is recommended.
Suspension Seals:
Fork seals can be prone to leaks after hard riding; periodic inspection and maintenance are important.
Carburetor Jetting:
May require re-jetting based on altitude and temperature changes for optimal performance.