Target Audience:
Professional technicians, DIY mechanics, Yamaha SR250 owners
Value Proposition:
Provides comprehensive, manufacturer-approved repair and maintenance information, saving on labor costs.
Accessibility:
Instant download, printable sections for workshop use.
Completeness:
Covers routine maintenance to complete engine overhauls, including wiring diagrams.
Primary Coverage:
Workshop Service, Repair, Maintenance, Troubleshooting, Overhaul
Estimated Pages:
Hundreds (specific count not provided, typical for comprehensive workshop manuals)
Type:
Workshop Service Manual / Repair Manual
Engine:
Detailed engine overhaul, tuning, carburetor, ignition system, lubrication system
Transmission:
Clutch operation, gearbox disassembly and assembly, shifting mechanism
Electrical System:
Wiring diagrams, lighting system, charging system, ignition system, starter system, battery maintenance
Chassis And Suspension:
Front fork (telescopic), rear suspension (swingarm, shock absorbers), steering system, frame inspection
Brakes:
Front disc brake, rear drum brake, hydraulic system, brake pad/shoe replacement
Fuel System:
Fuel tank, fuel petcock, fuel lines, carburetor (likely Mikuni VM series)
Exhaust System:
Muffler, exhaust pipe, gasket replacement
Maintenance:
Periodic maintenance charts, oil changes, filter replacements, chain adjustment, spark plug checks
Repair:
Step-by-step repair instructions for all major components
Troubleshooting:
Diagnostic guides for common problems, symptoms, and solutions
Overhaul:
Complete engine and component overhaul procedures
Adjustments:
Carburetor tuning, valve clearance adjustment, brake adjustments
Wiring Diagrams:
Detailed electrical schematics included
Depth:
Comprehensive, suitable for professional technicians and advanced DIY enthusiasts
Engine Type:
Four-stroke, Single-cylinder, Air-cooled
Displacement:
249 cc (approximately)
Bore X Stroke:
Typically around 71.0 mm x 62.0 mm (specific values to be confirmed in manual)
Compression Ratio:
Typically around 9.5:1 (specific values to be confirmed in manual)
Horsepower:
Approx. 18-20 HP (specific values to be confirmed in manual)
Torque:
Approx. 18-20 Nm (specific values to be confirmed in manual)
Carburetor Type:
Likely Mikuni VM34SS or similar single carburetor
Fuel Type:
Unleaded gasoline
Oil Type:
SAE 10W-40 or 20W-40 motorcycle specific oil (refer to manual for exact specifications)
Oil Capacity:
Approx. 1.8 - 2.0 Liters (refer to manual for exact specifications)
Ignition Type:
CDI (Capacitor Discharge Ignition)
Valvetrain:
SOHC (Single Overhead Camshaft), 2 valves per cylinder
Cooling Method:
Air-cooled
Transmission Type:
5-speed constant mesh
Clutch Type:
Wet, multi-plate
Gear Ratios:
Specific gear ratios detailed in the manual
Transmission Oil Type:
Yamalube or equivalent motorcycle transmission oil (refer to manual for exact specifications)
Transmission Oil Capacity:
Refer to manual for exact specification
Length:
Refer to manual for exact specification
Width:
Refer to manual for exact specification
Height:
Refer to manual for exact specification
Dry Weight:
Approx. 147 kg (refer to manual for exact specification)
Wet Weight:
Refer to manual for exact specification
Front Tire Size:
Typically 3.00-18 4PR or similar
Rear Tire Size:
Typically 110/90-18 M/C 61S or similar
Front Wheel:
Spoked wheel
Crash Test Ratings:
Not applicable to vintage motorcycles in the modern sense.
Braking System:
Front disc brake, Rear drum brake
Lighting:
Headlight, Taillight, Turn Signals
Oil Change Interval:
Typically every 3,000 km or 6 months (refer to manual for precise interval)
Spark Plug Replacement:
Refer to manual for recommended interval
Valve Clearance Check:
Typically every 6,000 km or 12 months (refer to manual for precise interval)
Brake Fluid Type:
DOT 3 or DOT 4 (refer to manual for exact specification)
Fork Oil Type:
Specific viscosity fork oil, e.g., SAE 10W (refer to manual for exact specification)
Carburetor Performance:
Can be prone to clogging if fuel is left stagnant; requires regular cleaning and adjustment. Ignition coil performance degradation over time.
Electrical Connections:
Corrosion in connectors can lead to intermittent electrical faults.
Engine Compression:
Wear in piston rings and cylinder bore can lead to reduced compression over high mileage.
Exhaust Flange Leaks:
Exhaust header flange gaskets can wear out, leading to exhaust leaks.
Yamaha Motorcycle Division:
Yamaha Motor Company is renowned for its innovation and performance in motorcycle manufacturing, dating back to the early 1950s.
Sr Series:
The SR series is known for its classic styling and reliable single-cylinder engines, embodying a minimalist and pure motorcycle experience.
Production Period:
The SR250 model line was produced for many years, with the SR250G specifically covering the early 1980s.
