Target Audience:
Yamaha WR250 owners, DIY mechanics, restoration enthusiasts, parts suppliers.
Value Proposition:
Provides essential OEM part identification to facilitate cost-effective repairs and maintenance, bypassing expensive dealer-only information access.
Core Benefit 1:
Illustrated exploded parts diagrams for clear visualization of component layout.
Core Benefit 2:
Complete listing of OEM part numbers for accurate sourcing.
Core Benefit 3:
User-friendly language making it accessible to a wide range of technical abilities.
Core Benefit 4:
Instant digital download eliminates shipping costs and wait times.
Engine Components:
Cylinder, Piston, Crankshaft, Valves, Carburetor, Ignition System, Exhaust System
Chassis Components:
Frame, Subframe, Swingarm, Linkage, Forks, Rear Shock Absorber
Drivetrain Components:
Transmission, Clutch, Drive Chain, Sprockets
Wheel Components:
Rims, Hubs, Spokes, Tires, Brake Discs, Calipers
Electrical Components:
Wiring Harness, Lights, Battery, CDI Unit, Stator, Rectifier/Regulator
Bodywork Components:
Fuel Tank, Seat, Fenders, Number Plates, Handlebars, Controls
Suspension Components:
Front fork internals (springs, damping rods, seals), rear shock absorber components (spring, damping adjustments, seals), linkages.
Fuel Delivery:
Carburetor assembly parts, fuel petcock components, fuel lines.
Disassembly Guidance:
Illustrations assist in understanding component relationships for disassembly.
Assembly Guidance:
Exploded diagrams are crucial for correct assembly of components.
Part Identification:
Explicit listing of all OEM part numbers for identification.
Part Ordering:
Provides part numbers necessary for ordering replacement parts from dealers or aftermarket suppliers.
Depth Of Coverage:
Comprehensive parts listing with detailed exploded diagrams, ideal for component-level replacement and identification.
Diagnostic Utility:
While not a diagnostic manual, it helps in identifying missing or damaged parts which can be a symptom of issues.
Exhaust Parts:
Exhaust pipe, muffler, exhaust gaskets, mounting hardware.
Radiator Parts:
Radiator assembly, hoses, clamps, radiator cap, fan components (if applicable).
Throttle Control:
Throttle grip, throttle cable, throttle position sensor (if applicable).
Clutch Control:
Clutch lever, clutch cable, clutch perch components.
Brake Controls:
Brake levers, master cylinders, brake pedal, brake light switch.
PDF Quality:
High-resolution, printable quality.
Searchability:
Likely text-searchable PDF for quick part number lookup.
Printability:
Designed to be printed page-by-page or in sections as needed.
Binding Type:
N/A (Digital download - Print as needed)
Paper Type:
N/A (Digital download - User's choice)
Engine Type:
Liquid-cooled, 2-stroke, reed valve, YPVS (Yamaha Power Valve System)
Displacement:
239cc (Approximate, may vary slightly based on specific WR250 model variants within 1997)
Bore X Stroke:
67.0 mm x 66.0 mm (Typical for this era WR250)
Compression Ratio:
Approx. 8.8:1 (May vary)
Horsepower:
Approx. 45-50 HP (Estimated, official figures often not published for competition models)
Torque:
Approx. 28-30 lb-ft (Estimated)
Carburetor Type:
Mikuni VM38 (Commonly used)
Fuel Type:
Unleaded gasoline (Minimum 91 octane recommended, mixed with 2-stroke oil)
Safety Certification:
N/A (Off-road motorcycles are generally not subjected to the same crash safety ratings as street vehicles).
Braking System:
Hydraulic disc brakes, front and rear. Manual lists all associated components (calipers, master cylinders, lines, pads, discs).
Frame Construction:
Steel perimeter frame providing structural integrity. Parts manual details frame sections and mounting points.
Oil Change Interval:
N/A (2-stroke engines utilize mixed fuel; gearbox oil change intervals would be specified in a service manual, but this parts manual lists gearbox components.)
Spark Plug Replacement:
N/A (Spark plug part numbers are listed, but intervals are in the service manual.)
Engine Oil Type:
2-stroke premix oil (Specific brands and ratios would be in the owner's/service manual, but parts for the oil injection system if applicable would be listed).
Gearbox Oil Type:
Yamalube Gear Oil or equivalent SAE 10W-30 API SG (Typical specification, consult service manual for precise details. This manual provides part numbers for gearbox components.)
Coolant Type:
Permanent type antifreeze coolant (Ethylene glycol based) - Consult service manual for specific mix ratio and part numbers for cooling system components.
Common Wear Items:
Piston rings, clutch plates, wheel bearings, fork seals, chain and sprockets. Parts are cataloged for easy replacement.
Ypvs System:
The Yamaha Power Valve System (YPVS) can accumulate carbon and require cleaning or replacement of its control cable and servo motor components, all of which are listed.
Yamaha Motorcycles:
Yamaha has a long and successful history in motorcycle racing and production, particularly in the off-road segment with its YZ and WR lines.
Wr250 Lineage:
The WR250 is Yamaha's dedicated off-road competition/trail bike, evolving from the YZ platform. The 1997 model represents a specific iteration of this successful lineage, known for its robust 2-stroke power and handling.
Manufacturing Origin:
Japan (Typical for Yamaha motorcycles of this era)
