Engine Mechanical:
Engine assembly, disassembly, inspection, overhaul, piston, rings, cylinder, crankshaft, connecting rod, valve train, timing
Fuel System:
Carburetor (Mikuni VM17SH), fuel tank, fuel filter, fuel lines, fuel pump (if applicable)
Cooling System:
Radiator, fan, coolant, hoses, thermostat (if applicable)
Ignition System:
CDI unit, ignition coil, spark plug, wiring
Exhaust System:
Muffler, exhaust pipe, heat shields
Transmission Drivetrain:
Automatic CVT (Continuously Variable Transmission), drive clutch, driven clutch, V-belt, reduction gear, kick starter mechanism
Brakes:
Front disc brake (hydraulic), rear drum brake, brake fluid, brake lines, master cylinder, caliper, brake pads, brake shoes
Suspension:
Front telescopic fork, rear swingarm, shock absorber, fork seals, bushings
Steering:
Handlebar, steering stem, bearings, steering lock
Electrical System:
Battery, charging system (stator, rectifier/regulator), lighting (headlight, taillight, indicators), horn, starter motor, wiring harness, fuses
Wheels Tires:
Wheel specifications, tire sizes, valve stems, bearings
Bodywork Frame:
Frame inspection, body panels, seats, storage compartment, fasteners
Maintenance:
Scheduled maintenance, oil changes, filter replacements, spark plug checks, brake adjustments, chain lubrication (if applicable), CVT belt inspection
Troubleshooting:
Diagnostic charts for common problems, symptom-based troubleshooting, electrical issue diagnosis
Repair:
Step-by-step repair instructions for all major components and systems
Overhaul:
Complete engine and transmission overhaul procedures
Inspection:
Detailed inspection procedures for wear and damage
Depth:
Professional-level, covering disassembly, assembly, specifications, tolerances, and diagnostic procedures
Engine Type:
4-stroke, liquid-cooled, SOHC
Engine Displacement:
49.4 cc
Bore X Stroke:
38.0 mm x 43.5 mm
Compression Ratio:
12.0:1
Carburetor Model:
Mikuni VM17SH
Spark Plug Type:
NGK CR7E (typical, consult manual for exact)
Air Filter Type:
Paper element (replaceable)
Horsepower:
Approx. 4.0 HP @ 7500 RPM (estimate, refer to manual for exact)
Torque:
Approx. 3.0 lb-ft @ 6000 RPM (estimate, refer to manual for exact)
Fuel Type:
Unleaded gasoline, 87 octane minimum
Fuel Tank Capacity:
1.6 US gallons (6.0 L)
Engine Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40 API SG or higher
Engine Oil Capacity:
0.85 US qt (0.80 L) (without filter change), 0.95 US qt (0.90 L) (with filter change)
Crash Test Ratings:
N/A (Scooter category, not typically rated by NHTSA/IIHS)
Braking System:
Front hydraulic disc brake, rear drum brake
Lighting:
Halogen headlight, LED taillight/brake light, front and rear turn signals
Frame Construction:
Steel tube frame for durability
Handlebar Design:
Wide, upright handlebars for stability and control
Engine Oil Change:
Every 2,000 miles (3,000 km) or 6 months
Gear Oil Change:
Every 4,000 miles (6,000 km) or 12 months
Air Filter Cleaning/Replacement:
Inspect every 2,000 miles (3,000 km), replace as needed
Spark Plug Replacement:
Inspect every 2,000 miles (3,000 km), replace as needed
Cvt Belt Inspection:
Inspect every 4,000 miles (6,000 km), replace if worn or damaged
Brake Fluid Flush:
Every 2 years (standard practice, check manual)
Engine Oil Viscosity:
SAE 10W-40
Gear Oil Viscosity:
SAE 80 API GL-4
Brake Fluid Type:
DOT 3 or DOT 4
Common Wear Items:
CVT belt, brake pads, tires, suspension bushings, starter motor brushes
Carburetor Idling:
Carburetor can sometimes develop idling issues if not cleaned or adjusted properly
Cooling System Maintenance:
Regular coolant flushes are important to prevent overheating in the liquid-cooled engine.
