Segment:
Entry-level sport motorcycle, popular among younger riders and for light urban commuting.
Competitors:
Honda RS50, Yamaha TZR50, Gilera SMT/RCR 50, Derbi Senda R/SM 50.
Design:
Aggressive sportbike styling inspired by larger Aprilia RS models, lightweight chassis, responsive 50cc engine.
Performance Characteristics:
Nimble handling, quick acceleration for its class, capable of achieving legal speed limits for 50cc mopeds/motorcycles.
Engine System:
Detailed disassembly, assembly, inspection, and repair of the 50cc 2-stroke Minarelli AM6 engine, including cooling system, lubrication, fuel and ignition systems.
Transmission System:
Complete coverage of the 6-speed gearbox, clutch assembly, and shifting mechanisms.
Chassis And Suspension:
Front fork (upside-down), rear shock absorber, swingarm, wheel bearings, steering system, and frame inspection.
Brake System:
Front and rear hydraulic disc brake systems, including caliper overhaul, bleeding procedures, and pad replacement.
Electrical System:
Wiring diagrams, ignition system (CDI), lighting, charging system (stator/rotor), battery, and starter motor troubleshooting.
Fuel System:
Carburetor (Dell'Orto PHBN 14) specifications, adjustment, and overhaul; fuel tank, petcock, and lines.
Cooling System:
Liquid cooling system maintenance, radiator, water pump, and coolant specifications.
Bodywork And Trim:
Fairing removal, seat, fuel tank, and other body panel components.
Routine Maintenance:
Oil changes, spark plug replacement, air filter cleaning/replacement, chain adjustment, brake pad checks.
Engine Repair:
Top-end rebuild (piston, cylinder, head), crankshaft and bearing replacement, cylinder head gasket replacement.
Transmission Repair:
Gearbox disassembly and reassembly, clutch inspection and replacement.
Suspension Service:
Front fork oil change and seal replacement, rear shock absorber inspection.
Brake Service:
Brake fluid flush and bleed, caliper servicing, disc and pad replacement.
Electrical Troubleshooting:
Diagnostic steps for starting issues, charging system failures, lighting malfunctions.
Carburetor Tuning:
Jetting recommendations, idle speed adjustment, mixture control.
Depth:
In-depth technical repair and overhaul procedures, including detailed torque specifications and tolerances.
Engine Type:
2-stroke, single-cylinder
Bore X Stroke:
39.5 x 40.3 mm
Cooling System:
Liquid-cooled
Power Output:
Approx. 8-10 HP (depending on regulations and specific tuning)
Torque:
N/A (typically not a primary spec for this class, but available in manual)
Top Speed:
Limited by regulations, typically around 45-50 mph (70-80 km/h)
Carburetor Model:
Dell'Orto PHBN 14 HS
Fuel Type:
Unleaded gasoline (95 RON recommended) mixed with 2-stroke oil
Oil Mixture:
Automatic oil injection or pre-mix (refer to manual for specific ratios if pre-mixing).
Safety Ratings:
Not applicable in the same way as cars; refers to adherence to regional moped/light motorcycle regulations.
Braking System:
Hydraulic disc brakes front and rear, typically with braided lines for improved feel.
Suspension Features:
Upside-down telescopic front fork, monoshock rear suspension for agile handling and stability.
Lighting:
Halogen headlight, LED taillight, turn signals.
Frame Construction:
Deltabox-style perimeter frame (often aluminum or steel alloy) for rigidity.
Oil Change Interval:
Refer to manual; typically every 5,000-10,000 km or annually for gearbox oil.
Spark Plug Interval:
Refer to manual; typically every 5,000-8,000 km.
Air Filter Maintenance:
Clean every 3,000-5,000 km, replace as needed.
Engine Oil Type:
High-quality 2-stroke synthetic oil for automatic injection systems or pre-mix (specific brands and JASO FD standard recommended).
Gearbox Oil Type:
API GL-4 or GL-5, SAE 75W/90 or 80W/90 gear oil (refer to manual for exact specification).
Coolant Type:
Ethylene glycol-based antifreeze with corrosion inhibitors, mixed 50/50 with distilled water.
Brake Fluid Type:
DOT 4 hydraulic brake fluid.
Carburetor Fouling:
Common in 2-strokes if not properly maintained or if using incorrect oil ratios, leading to starting issues or poor running.
Exhaust Carbon Buildup:
Can lead to reduced performance; requires occasional cleaning or decoking.
Voltage Regulator Failure:
Can cause charging system issues; a common point of failure in many small motorcycles.
