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Introduction
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Market Position
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Segment:
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Entry-level to mid-range sport underbone/moped
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Target Audience:
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Commuters, young riders, performance-oriented riders seeking practical and sporty transportation
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Competitive Analysis
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Key Competitors:
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Honda Supra X 125, Suzuki Satria F150, Kawasaki ZX-130 (market dependent)
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Key Features
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Performance Focus:
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One of the more powerful underbones in its class during its production run
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Design Appeal:
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Sporty styling, often incorporating aggressive fairings and graphics
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Practicality:
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Fuel efficiency, agility for urban environments, relatively low maintenance costs
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Manual Value
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Purpose:
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Essential tool for owners and technicians for proper maintenance, repair, and troubleshooting.
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Manual Coverage
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Systems Covered
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Engine Mechanical:
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Top end (cylinder head, valves, camshaft), bottom end (crankshaft, connecting rod, pistons), lubrication, cooling, timing
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Fuel System:
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Carburetor (for earlier models) / Fuel Injection (for later models), fuel tank, fuel pump, fuel lines, throttle body, injectors
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Ignition System:
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CDI unit, ignition coil, spark plug, stator, pickup coil
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Transmission Drivetrain:
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Clutch (automatic centrifugal and manual assist), gearbox, final drive (chain and sprocket)
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Electrical System:
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Battery, charging system (alternator/stator), starter motor, lighting system (headlight, taillight, turn signals), horn, instrumentation
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Chassis Frame:
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Frame structure, swingarm, linkages
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Suspension:
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Front telescopic forks, rear monoshock suspension, linkage system
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Braking System:
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Front disc brake, rear disc brake (or drum on some variants), master cylinders, calipers, brake lines
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Wheels Tires:
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Wheel assembly, tire specifications, bearing maintenance
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Bodywork Fairings:
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Panel removal and installation, seat, fuel tank cover, fairings
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Controls:
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Handlebars, levers, pedals, cables
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Procedures Included
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General Maintenance:
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Oil changes, filter replacement, chain lubrication and adjustment, spark plug checks, brake pad checks, tire pressure checks
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Disassembly Reassembly:
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Complete step-by-step instructions for major components (engine, transmission, suspension, brakes)
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Troubleshooting:
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Diagnostic flowcharts and symptom-based guides for common problems
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Repair Instructions:
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Detailed procedures for component repair and replacement
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Overhaul:
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Engine and transmission rebuild procedures
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Electrical Diagnostics:
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Wiring diagrams with explanations for troubleshooting electrical faults
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Parts Identification:
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Exploded views with part numbers for ordering
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Technical Depth
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Depth:
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Comprehensive (covers routine maintenance, diagnostics, repair, and complete overhaul)
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Detail Level:
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Factory-level detail with precise specifications and procedures
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Engine Specifications
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Primary Engine
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Type:
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Four-stroke, SOHC, 4-valve, liquid-cooled, single-cylinder
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Displacement:
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134 cc
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Bore X Stroke:
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Approx. 54.0 mm x 58.7 mm
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Compression Ratio:
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Approx. 11.0:1 (varies slightly by year/market)
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Performance
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Horsepower:
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Approx. 11.8 - 12.2 PS @ 8500 rpm (varies by market and tune)
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Torque:
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Approx. 10.7 - 10.9 Nm @ 6500 rpm (varies by market and tune)
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Fuel System
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Fuel Delivery:
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Carburetor (e.g., Mikuni VM22 type) or Electronic Fuel Injection (EFI) depending on model variant and year
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Fuel Type:
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Unleaded gasoline
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Cooling System
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Cooling Method:
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Liquid-cooled
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Lubrication
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Oil Type:
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API SG or higher, SAE 10W-40 recommended (check manual for specific viscosity)
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Oil Capacity:
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Approx. 0.9 - 1.0 Liters (with oil filter change)
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Maintenance
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Service Intervals
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Engine Oil Change:
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Every 3,000 km or 3 months, whichever comes first. (Refer to manual for specific interval recommendation).
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Air Filter Cleaning:
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Every 6,000 km or 6 months. Replace if damaged or excessively dirty.
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Spark Plug Check Replace:
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Check every 6,000 km, replace as needed or every 12,000 km. (Use recommended plug, e.g., NGK CR9E).
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Chain Lubrication Adjustment:
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Lubricate every 1,000 km, adjust chain slack every 2,000 km. (Refer to manual for precise slack specification, typically 20-30 mm).
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Brake Pad Inspection:
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Inspect at every 3,000 km service.
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Fluid Specifications
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Coolant Type:
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Ethylene glycol-based coolant, mix of 50% coolant and 50% distilled water. (Refer to manual for specific Yamaha coolant recommendation).
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Brake Fluid Type:
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DOT 3 or DOT 4 brake fluid (check manual for specific type).
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Known Issues
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Clutch Wear:
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Centrifugal clutch may experience wear over time, leading to slipping or inconsistent engagement, especially with aggressive riding.
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Engine Overheating:
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Can occur if coolant levels are low or the cooling system is not functioning properly (e.g., clogged radiator, faulty thermostat).
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Electrical Connections:
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Corrosion or loose connections in the electrical system can lead to intermittent faults, especially in humid environments.
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Recommended Parts
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Oil Filter Part Number:
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Commonly uses Yamaha part numbers like 5YP-13440-00 or equivalent aftermarket filters.
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Spark Plug Recommendation:
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NGK CR9E or similar (check manual for exact spec).
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