Target Audience:
Yamaha SR250/SR250G owners, independent repair shops, restoration enthusiasts.
Value Proposition:
Provides comprehensive, professional-level repair and maintenance information for a specific vintage motorcycle model, offering significant cost savings over dealership service.
Manual Content:
Detailed sub-steps, notes, cautions, warnings, numbered instructions, bold figure numbers, detailed illustrations, enlarged insets, troubleshooting, wiring diagrams.
Accessibility:
Instant download eliminates shipping costs and waiting times.
Engine:
Complete engine overhaul, tuning, diagnostics, lubrication system, cooling system (if applicable), fuel system, ignition system.
Transmission:
Clutch operation and adjustment, gearbox inspection and repair, shift mechanism.
Chassis:
Frame inspection and repair, suspension (front fork, rear shock absorber), steering system, wheels and tires.
Brakes:
Front and rear brake system diagnosis, repair, fluid replacement, caliper and master cylinder servicing.
Electrical:
Wiring diagrams, lighting system, starting system, charging system (alternator/generator, regulator), battery maintenance, instrumentation.
Fuel System:
Carburetor disassembly, cleaning, adjustment, fuel tank, fuel lines.
Exhaust System:
Exhaust pipe and muffler inspection and replacement.
Bodywork And Trim:
Fairings, fenders, seat, handlebars, controls, emblems.
Maintenance:
Regular service schedules, oil changes, filter replacements, chain adjustment, brake adjustments, spark plug replacement.
Troubleshooting:
Systematic diagnostic procedures for common and uncommon problems, electrical fault finding.
Repair:
Detailed step-by-step instructions for component removal, replacement, and reassembly.
Rebuild:
Comprehensive instructions for engine and major component rebuilds.
Refurbishment:
Guidance on restoring components to original specifications.
Restoration:
In-depth information to guide complete motorcycle restoration.
Depth:
Comprehensive, suitable for professional technicians and advanced DIY mechanics.
Required Software:
Adobe PDF Reader, WinRAR (for extraction)
Compatibility:
All versions of Windows & Mac
Print Capability:
High-resolution, fully printable pages
Binding:
Digital (Downloadable PDF)
Paper Medium:
N/A (Digital Format)
Engine Type:
Four-stroke, single-cylinder, SOHC
Displacement:
Approximately 249cc (specific bore and stroke would be detailed in manual)
Bore X Stroke:
Refer to manual for precise specifications (e.g., typically around 71mm x 62mm for similar Yamaha singles)
Compression Ratio:
Refer to manual for precise specifications (e.g., typically around 9.5:1)
Horsepower:
Refer to manual for precise specifications (e.g., typically around 19-21 HP at 7500 RPM)
Torque:
Refer to manual for precise specifications (e.g., typically around 19-20 Nm at 5500 RPM)
Carburetor Type:
Likely a single Mikuni VM or similar constant velocity (CV) carburetor, size approx. 34mm (specific model detailed in manual)
Fuel Delivery:
Gravity feed from fuel tank via fuel petcock.
Ignition Type:
CDI (Capacitor Discharge Ignition)
Oil Type:
Refer to manual for specific API service classification and viscosity grade (e.g., SAE 20W-40 or 10W-40 motorcycle oil).
Oil Capacity:
Refer to manual for precise capacity (e.g., approximately 1.7 - 1.9 liters with filter change).
Cooling Method:
Air-cooled
Overall Length:
Refer to manual for exact dimensions.
Overall Width:
Refer to manual for exact dimensions.
Overall Height:
Refer to manual for exact dimensions.
Dry Weight:
Refer to manual for exact dry weight (typically around 140-150 kg).
Wet Weight:
Refer to manual for exact wet weight.
Fuel Tank Capacity:
Refer to manual for exact capacity (typically around 10-12 liters).
Crash Test Data:
N/A for this era of motorcycle manual; focus is on mechanical safety.
Braking System:
Front: Disc brake; Rear: Drum brake. Specifics on caliper, rotor, and drum size detailed in manual.
Lighting:
Headlight, taillight, brake lights, turn signals (if equipped). Bulb specifications in manual.
Frame Construction:
Steel cradle frame construction.
Infotainment System:
N/A - Classic motorcycle with analog instrumentation.
Rider Assistance:
N/A - Basic mechanical systems only.
Connectivity Features:
N/A - No electronic connectivity.
Starter Type:
Kick starter. Electric start may have been an option on some SR250G variants, but the manual likely covers both or primary method.
Oil Change Interval:
Refer to manual; typically every 3,000 - 5,000 km or 6-12 months.
Spark Plug Replacement:
Refer to manual; typically every 10,000 - 15,000 km or annually.
Air Filter Cleaning/Replacement:
Refer to manual; periodic cleaning and replacement based on riding conditions.
Chain Lubrication And Adjustment:
Refer to manual; frequent checks recommended, especially after wet riding.
Valve Clearance Check:
Refer to manual; typically at higher mileage intervals (e.g., 20,000 km).
Engine Oil Spec:
Refer to manual for API SG/SH classification and SAE viscosity (e.g., 20W-40, 10W-40).
Brake Fluid Spec:
Refer to manual; likely DOT 3 or DOT 4.
Transmission Oil Spec:
Refer to manual; typically SAE 80W-90 GL-4 gear oil.
Common Wear Items:
Clutch wear, worn fork seals, carburetor jetting issues due to age and fuel quality, electrical connections degradation, chain and sprockets.
Specific Model Quirks:
Refer to manual for model-specific common issues and troubleshooting tips. Carburetor float bowl gaskets can degrade over time. Ignition coils can fail.
Yamaha Legacy:
Yamaha Corporation, founded in 1887, has a long and rich history in musical instruments, expanding into motorcycles in 1955 with the YA-1.
Sr Series Origin:
The SR series, particularly the SR400 and SR500, are celebrated for their simplicity, reliability, and classic styling. The SR250 was a smaller displacement variant, often targeting urban riders and those seeking a lighter, more manageable machine with similar classic appeal.
Production Period:
The SR250 and SR250G models were produced during the early 1980s, representing a specific era of Yamaha's single-cylinder motorcycle development.
Manufacturing Location:
Likely manufactured in Japan, consistent with Yamaha's primary production facilities during this period.
Model Awards:
While specific awards for the SR250 are not widely publicized, the SR series is recognized for its enduring design, reliability, and role in the classic motorcycle market.
Reliability Reputation:
Generally good reliability for the era, especially with proper maintenance. The simple, air-cooled single-cylinder design contributes to its robust nature.
Manual Quality Standard:
Meets industry standards for technical repair documentation, providing detailed, accurate, and actionable information.
