Vehicle Segment:
Entry-level off-road / trail bike
Target Audience:
Beginner riders, youth riders, recreational trail riders
Key Competitors:
Honda CRF100F/150F, Kawasaki KLX125/140, Suzuki DR-Z125
Handling Characteristics:
Known for predictable and stable handling, beginner-friendly
Durability:
Yamaha's reputation for robust engineering and reliability
Ease Of Maintenance:
Designed for straightforward maintenance by owners
Engine Overhaul:
Complete engine disassembly, inspection, repair, and reassembly
Fuel System:
Carburetor service, cleaning, adjustment, fuel pump, fuel lines
Ignition System:
Spark plug, ignition coil, CDI unit, timing checks
Lubrication System:
Oil pump, oil filter, oil passages, oil change procedures
Cooling System:
Air-cooled system specific checks, potential heat management advice
Transmission And Drivetrain:
Clutch operation, gearbox inspection, chain drive maintenance
Suspension System:
Front fork service, rear shock absorber inspection and adjustment, linkage maintenance
Braking System:
Front and rear brake pad replacement, caliper service, brake fluid flush (if applicable), drum brake adjustment
Electrical System:
Wiring diagrams, lighting, battery, starter, fuses, switches
Chassis And Frame:
Frame inspection, steering head bearing service, swingarm inspection
Wheels And Tires:
Tire pressure, wheel bearing service, spoke tensioning
Bodywork And Plastics:
Fairing removal and installation, seat maintenance
Routine Maintenance:
Oil changes, filter replacements, chain lubrication and adjustment, spark plug checks
Troubleshooting Guide:
Diagnostic charts for common problems and symptoms
Tune Up Procedures:
Carburetor tuning, valve clearance adjustment
Rebuild Instructions:
Engine, carburetor, and brake system rebuilds
Component Replacement:
Detailed steps for replacing major and minor components
Torque Specifications:
Crucial torque values for critical fasteners
Depth Of Coverage:
Comprehensive workshop level, suitable for intermediate to advanced DIY mechanics and professional technicians
Diagnostic Capabilities:
Detailed fault finding and diagnostic procedures for all major systems
Schematics And Diagrams:
Includes detailed wiring diagrams and exploded views
Engine Type:
Four-stroke, SOHC, air-cooled
Bore X Stroke:
54.0 mm x 54.5 mm
Valvetrain:
SOHC, 2 valves per cylinder
Horsepower:
Approximately 10-12 HP (estimate, varies with tune)
Torque:
Approximately 7-8 lb-ft (estimate, varies with tune)
Carburetor Model:
Mikuni VM20 (or similar 20mm carburetor)
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
Approximately 1.6 gallons (6.0 L)
Length:
Approximately 73.8 inches (1875 mm)
Width:
Approximately 31.5 inches (800 mm)
Height:
Approximately 43.7 inches (1110 mm)
Wheelbase:
Approximately 49.4 inches (1255 mm)
Ground Clearance:
Approximately 11.0 inches (280 mm)
Dry Weight:
Approximately 174 lbs (79 kg)
Wet Weight:
Approximately 183 lbs (83 kg) (estimated)
Seat Height:
Approximately 31.5 inches (800 mm)
Oil Change Interval:
Every 1000 km or 12 months (refer to manual for precise intervals and conditions)
Air Filter Cleaning:
Every 500 km or as needed based on operating conditions (refer to manual)
Spark Plug Replacement:
Every 6000 km or annually (refer to manual for specific plug type)
Valve Clearance Check:
Every 1000 km (refer to manual for specific clearance values)
Engine Oil Type:
Yamalube 4 (or equivalent SAE 10W-40 API SG or higher, JASO MA)
Engine Oil Capacity:
Approximately 0.95 L (0.84 Imp Qt, 1.0 US Qt) without filter change, 1.05 L (0.92 Imp Qt, 1.1 US Qt) with filter change (verify in manual)
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid (for disc brakes, if applicable)
Common Wear Items:
Clutch plates, brake pads, sprockets, chain, carburetor jets
Carburetor Fouling:
Can occur with infrequent use or poor fuel quality, requiring cleaning and jetting adjustments.
Suspension Seals:
Fork seals can degrade over time, leading to leaks, especially with aggressive riding.
