Category:
Entry-level to mid-range dual-sport motorcycle, popular for trail riding, light off-roading, and commuting.
Target Audience:
Beginner riders, recreational off-road enthusiasts, commuters seeking a versatile and reliable machine.
Competitors:
Honda CRF250L, Kawasaki KLX250S, Suzuki DR-Z250.
Features:
Robust air-cooled engine, durable chassis, long-travel suspension, capable off-road performance with street-legal amenities.
Engine:
Detailed disassembly, assembly, inspection, and adjustment procedures for the 249cc air-cooled, four-stroke, SOHC engine.
Fuel System:
Carburetor (likely Mikuni BS30 or similar) tuning, cleaning, and overhaul; fuel tank and petcock service.
Ignition System:
CDI ignition timing, spark plug specifications, troubleshooting.
Transmission:
5-speed constant mesh transmission service, clutch operation and adjustment, lubrication.
Drivetrain:
Chain and sprocket inspection and replacement, rear wheel hub and bearing service.
Suspension:
Front fork (telescopic) overhaul, oil level and specification; rear shock absorber adjustment and replacement; linkage system inspection.
Brakes:
Front and rear disc brake system service, hydraulic fluid specifications, caliper overhaul, pad replacement, bleeding procedures.
Electrical System:
Wiring diagrams, battery specifications, charging system (stator, regulator/rectifier), lighting, starter motor, and instrumentation.
Cooling System:
Air-cooled engine, focus on fin cleaning and airflow.
Frame And Bodywork:
Frame inspection, subframe, body panel removal and installation, seat, fuel tank, and fender service.
Maintenance:
Scheduled maintenance intervals, oil changes, filter replacements, chain adjustment, brake checks, bolt torquing.
Troubleshooting:
Systematic diagnostics for common running issues, electrical faults, and mechanical problems with flowcharts and symptom-based guides.
Repair:
Step-by-step instructions for component removal, disassembly, inspection, repair, reassembly, and installation.
Engine Rebuild:
Complete engine overhaul procedures, including piston, cylinder, crankshaft, and valve train service.
Suspension Rebuild:
Front fork seal replacement, rear shock absorber service, linkage bearing lubrication/replacement.
Electrical Diagnostics:
Wiring diagrams, component testing, and fault finding for the electrical system.
Brake Service:
Fluid replacement, bleeding, caliper and master cylinder overhaul, pad and rotor replacement.
Depth:
Comprehensive, covering basic maintenance to full engine and component rebuilds, suitable for professional mechanics and advanced DIY enthusiasts.
Searchability:
Likely text-searchable PDF for quick information retrieval.
Quality:
Factory Quality - High resolution, clear text and diagrams.
Readability:
Optimized for viewing on screen and printing.
Zoom Functionality:
Yes (standard PDF feature)
Binding:
Not applicable (Digital PDF)
Paper Type:
Not applicable (Digital PDF)
Engine Type:
249cc, Air-cooled, Four-stroke, SOHC, 2-valve
Bore X Stroke:
73.0 mm x 57.3 mm (typical for this class)
Compression Ratio:
9.5:1 or similar
Carburetor:
Mikuni BS30 (likely) or similar Constant Velocity carburetor
Ignition:
CDI (Capacitor Discharge Ignition)
Horsepower:
Approx. 20-22 HP (at crankshaft)
Torque:
Approx. 14-16 lb-ft (at crankshaft)
Fuel Type:
Unleaded gasoline (Octane rating as per manual)
Engine Oil Capacity:
Approx. 1.6 L (with oil filter change)
Engine Oil Change:
Every 3,000 km (1,800 miles) or 6 months.
Oil Filter Replacement:
Every 6,000 km (3,600 miles) or 12 months (concurrent with oil change).
Air Filter Cleaning:
Every 1,000 km (600 miles) or 6 months (more frequently if used in dusty conditions).
Spark Plug Inspection:
Every 6,000 km (3,600 miles).
Valve Clearance Check:
Every 12,000 km (7,200 miles).
Engine Oil Grade:
SAE 20W-40 or SAE 10W-30 (API SG or higher).
Brake Fluid Type:
DOT 4 Hydraulic Brake Fluid.
Fork Oil Grade:
Yamaha Fork Oil G10 (or equivalent SAE 10W fork oil).
Common Wear Items:
Clutch plates, brake pads, chain and sprockets, front fork seals, wheel bearings, swingarm bearings.
Carburetor Fouling:
Can occur with infrequent use or poor fuel quality, requiring cleaning and adjustment.
Suspension Seals:
Front fork seals can weep over time due to riding conditions and age.
Electrical Connections:
Corrosion or loose connections, particularly in exposed areas, can lead to intermittent electrical issues.
Manufacturer:
Yamaha Motor Company, renowned for performance and reliability in motorcycles and powersports.
Introduction Year:
The TTR250 series was introduced in the late 1990s, with the L/LC variants representing specific configurations or model years within that lineage.
Design Philosophy:
Designed as a capable, user-friendly, and durable dual-sport motorcycle, bridging the gap between trail bikes and street bikes.
Manufacturing Location:
Primarily Japan.
