Vehicle Segment:
Dual-sport/Enduro motorcycle
Target Audience:
Off-road enthusiasts, trail riders, and dual-sport riders seeking a reliable and capable machine.
Key Competitors:
Honda XR250R/L, Kawasaki KLX250S, Suzuki DR-Z250
Engine Type:
Four-stroke, air-cooled, SOHC
Durability:
Known for Yamaha's reputation for robust engineering and reliability.
Versatility:
Capable of both trail riding and street legal use (depending on configuration and local laws).
Engine:
Top-end (cylinder head, valves, camshaft), Bottom-end (crankshaft, connecting rod, pistons), Lubrication system, Cooling system (if applicable), Fuel injection/Carburetor system, Ignition system, Starting system, Exhaust system
Transmission:
Gearbox (shifting mechanisms, gears, bearings), Clutch (operation, adjustment, replacement), Final drive (chain, sprockets)
Chassis And Suspension:
Frame, Forks (front suspension - damping, springs, seals), Rear shock absorber (rear suspension - adjustment, rebuilding), Swingarm, Linkages, Bearings (steering head, wheel, swingarm)
Brakes:
Front brake system (caliper, master cylinder, lines, pads, discs), Rear brake system (caliper, master cylinder, lines, pads, discs), Bleeding procedures, Brake fluid specifications
Electrical System:
Wiring diagrams, Lighting system (headlight, taillight, signals), Charging system (stator, rectifier/regulator), Battery, Ignition control unit (CDI/ECU), Ignition timing, Switches, Fuses, Troubleshooting electrical faults
Bodywork And Controls:
Seat, Fuel tank, Fenders, Handlebars, Levers, Cables (throttle, clutch), Footpegs, Seat mounting, Decals and graphics
Routine Maintenance:
Oil change intervals and procedures, Oil filter replacement, Air filter cleaning/replacement, Spark plug inspection/replacement, Chain adjustment and lubrication, Brake pad wear checks, Tire pressure checks, Cable adjustments (throttle, clutch)
Troubleshooting:
Diagnostic flowcharts, Common symptom identification, Root cause analysis for engine performance issues, electrical faults, braking problems, suspension behavior
Major Repairs:
Engine disassembly and reassembly (top-end and bottom-end), Transmission overhaul, Carburetor/Fuel injection system rebuild, Fork seal replacement, Rear shock absorber service, Brake caliper rebuilding, Wheel bearing replacement
Specifications And Data:
Torque specifications for all fasteners, Valve clearance specifications, Piston ring gap, Cylinder bore specifications, Carburetor jet sizes, Ignition timing specifications, Fluid capacities and types
Depth:
Comprehensive from basic owner maintenance to full engine and transmission rebuilds, including electrical system diagnostics and component-level repairs. Designed for both novice mechanics and experienced technicians.
Engine Type:
249cc, 4-stroke, SOHC, 2-valve
Cooling System:
Air-cooled
Bore X Stroke:
73.0 mm x 59.6 mm (typical for this engine family)
Compression Ratio:
10.2:1 (typical)
Horsepower:
~20-25 HP (estimated, varies by market and tuning)
Torque:
~18-20 Nm (estimated)
Fuel Delivery:
Carburetor (likely Mikuni VM34 or similar for earlier models, potentially EFI on later 'L' models if introduced, though manual specifies carb)
Carburetor Size:
34 mm (typical for this class)
Valvetrain:
SOHC with 2 valves per cylinder. Manual will detail valve clearance checks and adjustment procedures.
Engine Oil Change:
Every 3,000 km or 6 months (typical for this era, consult manual for exact spec).
Oil Filter Change:
With every oil change (typical).
Air Filter Cleaning:
Every 1,000 km or as needed based on riding conditions.
Valve Clearance Check:
Every 10,000 km (typical, consult manual for exact spec).
Engine Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40 API SG or higher motorcycle oil.
Engine Oil Capacity:
1.80 L (with oil filter replacement).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Fork Oil Type:
Yamaha Fork Oil 10W (or equivalent).
Fork Oil Capacity:
Approx. 360 ml per fork leg (check manual for precise amount).
Common Wear Items:
Clutch plates (due to heavy use in off-road conditions), wheel bearings, steering head bearings, fork seals.
Carburetor Tuning:
May require periodic cleaning and adjustment, especially if exposed to dirty conditions or varying altitudes.
Electrical Connections:
Corrosion in electrical connectors can occur with exposure to moisture, requiring cleaning and dielectric grease.
