Market Segment:
Entry-level sportbike, youth-oriented performance motorcycle.
Target Audience:
Young riders seeking performance and sporty styling on a budget.
Key Competitors:
Yamaha TZR 125, Aprilia AF1 125, Honda NSR 125, Suzuki RG 125.
Styling:
Aggressive, full-fairing sportbike aesthetics characteristic of the late 1980s.
Engine Platform:
Leveraged proven two-stroke engine technology, often based on Rotax designs, known for spirited performance.
Handling:
Designed for agile handling and sporty riding dynamics.
Engine Mechanical:
Complete overhaul procedures, component identification, torque specifications, timing, cylinder head, pistons, connecting rods, crankshaft, gearbox components.
Engine Electrical:
Ignition system (CDI, spark plugs, coils), starting system, charging system (alternator, rectifier), wiring diagrams, component testing.
Fuel System:
Carburetor (likely Dell'Orto PHBH 28 AS or similar) disassembly, cleaning, adjustment, jetting, fuel pump (if applicable), fuel lines, fuel tank.
Cooling System:
Liquid cooling system components, radiator, water pump, thermostat, coolant specifications, bleeding procedures.
Transmission:
Clutch operation, gearbox disassembly and reassembly, gear selection, lubrication, shifting mechanism.
Suspension Front:
Telescopic fork service, oil change, seal replacement, spring rates, damping adjustments, steering head bearing service.
Suspension Rear:
Monoshock absorber service, linkage maintenance, swingarm bearings, rear wheel axle.
Brakes Front:
Disc brake system, caliper service, pad replacement, master cylinder overhaul, brake fluid specifications, bleeding procedures.
Brakes Rear:
Disc brake system (likely), caliper service, pad replacement, master cylinder overhaul, brake fluid specifications, bleeding procedures.
Wheels Tires:
Wheel bearing service, rim specifications, tire pressure recommendations, valve stem maintenance.
Electrical System Main:
Lighting system (headlight, taillight, indicators), horn, battery specifications, fuse box layout and function.
Bodywork Frame:
Fairing removal and installation, seat, fuel tank mounting, chassis integrity checks, frame specifications.
Routine Maintenance:
Oil changes, filter replacements, chain adjustment and lubrication, spark plug inspection/replacement, air filter cleaning/replacement.
Troubleshooting:
Diagnostic flowcharts for common problems, symptom-based troubleshooting guides for starting, running, and electrical issues.
Major Repairs:
Engine rebuilds, gearbox overhauls, suspension component replacement, brake system overhauls.
Diagnostics:
Testing electrical components, checking ignition timing, carburetor tuning, compression testing.
Wiring Diagrams:
Detailed, color-coded wiring diagrams for all electrical systems.
Depth Level:
Comprehensive (suitable for DIY mechanics and professional technicians)
Detail Level:
Step-by-step instructions with clear diagrams and photographs (where applicable in digital format).
Special Tools:
Identification and usage of special tools required for specific procedures.
Engine Type:
Liquid-cooled, two-stroke, single-cylinder
Displacement:
124.8 cc (approx.)
Bore X Stroke:
56.0 mm x 50.6 mm (typical for this platform)
Induction:
Reed valve induction with rotary disc valve (likely) and carburetor
Horsepower Output:
Approx. 28-30 HP (at crankshaft, depending on market regulations and specific tune)
Torque Output:
Approx. 19-21 Nm (at crankshaft, depending on tune)
Carburetor Model:
Dell'Orto PHBH 28 AS (common fitment)
Fuel Type:
Unleaded gasoline (minimum 95 RON), mixed with 2-stroke oil
Lubrication System:
Premix or Autolube (oil injection system)
Engine Oil Change:
Every 3,000-5,000 km or annually (refer to manual for exact interval). Use high-quality 2-stroke oil.
Spark Plug Inspection:
Every 3,000-6,000 km. Check gap and condition.
Air Filter Cleaning:
Every 3,000-5,000 km. Clean and re-oil if applicable.
Chain Maintenance:
Lubricate and adjust chain every 500-1,000 km or as needed based on slack.
Brake Fluid Change:
Every 2 years or as per manual recommendation.
Engine Oil Type:
API TC-rated synthetic or semi-synthetic 2-stroke oil (specific viscosity like 10W-30 or 15W-50 may be recommended for autolube).
Coolant Type:
Ethylene glycol-based coolant, typically a 50/50 mix with distilled water.
Transmission Oil Type:
SAE 75W/90 or SAE 80W/90 GL-4 gear oil (capacity approx. 0.8-1.0 liters).
Two Stroke Specific:
Carbon build-up in exhaust port, piston ring wear, exhaust power valve sticking (if equipped), clutch wear.
Electrical Common:
Aging wiring harnesses, regulator/rectifier failures, CDI unit issues.
Suspension:
Fork seal leaks, worn rear shock absorber damping.
Carburetion:
Carburetor jetting sensitive to altitude and temperature changes; potential for diaphragm wear.
