Target Audience:
Owners, mechanics, restoration specialists, and parts suppliers for the 1981 Yamaha SR250H Exciter.
Value Proposition:
Provides crucial OEM part numbers, vital for sourcing correct and compatible replacement parts, ensuring authenticity and proper fitment, especially for classic and vintage motorcycles.
Essential Resource:
Indispensable for any work involving the Yamaha SR250H Exciter, from routine maintenance to complete overhauls.
Part Number Accuracy:
Ensures that technicians and owners order the exact, correct parts, preventing costly mistakes and delays.
General Coverage:
Comprehensive parts listing and identification for the Yamaha SR250H Exciter motorcycle.
Specific Systems Covered:
Engine, Fuel System, Exhaust System, Transmission, Clutch, Electrical System, Ignition System, Frame, Suspension (Front and Rear), Brakes (Front and Rear), Wheels, Tires, Controls, Bodywork, and Accessories.
Type:
Parts Catalog / Parts Manual
Engine Assembly:
Detailed diagrams and part numbers for all engine components, including cylinder, piston, crankshaft, valves, camshaft, and internal lubrication system.
Fuel Delivery:
Exploded views of the carburetor, fuel tank, fuel lines, petcock, and related fittings.
Exhaust System:
Part identification for the exhaust manifold, header pipe, muffler, and mounting hardware.
Transmission And Drivetrain:
Diagrams illustrating gearbox components, shift drum, gears, drive chain, and sprockets.
Clutch System:
Detailed parts breakdown of the clutch assembly, including plates, springs, and actuating mechanism.
Electrical Components:
Identification of stator, alternator, wiring harness, battery, fuses, relays, and lighting components.
Ignition System:
Parts for the CDI unit, ignition coil, spark plug cap, and timing components.
Front Suspension:
Diagrams of front forks, springs, damping rods, seals, and steering components.
Rear Suspension:
Parts listing for the swingarm, shock absorbers, linkages, and bearings.
Front Brake:
Identification of brake caliper, master cylinder, brake disc, pads, and brake lines.
Rear Brake:
Parts for the rear brake mechanism (drum or disc, depending on specific SR250H variant), linkage, and cable.
Wheels And Tires:
Component identification for rims, spokes, hubs, bearings, and valve stems.
Controls And Cables:
Parts for throttle, clutch, and brake levers, cables, and control housings.
Bodywork And Fittings:
Identification of fuel tank, seat, fenders, side covers, instrument cluster, and fasteners.
Part Identification:
Primary function is to identify and list all replaceable parts with their corresponding OEM part numbers.
Assembly And Disassembly:
Provides visual guidance through exploded diagrams for understanding component relationships during repair or replacement.
Ordering Parts:
Facilitates accurate ordering of replacement parts by providing definitive OEM part numbers.
Depth:
Detailed parts enumeration, essential for mechanics, technicians, and enthusiasts undertaking repair, restoration, or maintenance.
User Level:
Intermediate to Advanced, primarily for those familiar with motorcycle mechanics and parts identification.
Digital Format:
N/A (This listing indicates a physical print manual)
Print Quality:
Expected to be good to excellent, typical for OEM or high-quality aftermarket reproduction parts manuals, with clear line drawings.
Binding:
Likely perfect bound or saddle-stitched, designed for durability in a workshop environment.
Paper Type:
Durable paper stock, often matte or semi-gloss, suitable for repeated use and referencing grease-stained hands.
Engine Type:
Four-stroke, SOHC, single-cylinder
Displacement:
249 cc (15.2 cu in)
Bore X Stroke:
74.0 mm x 58.0 mm (2.91 in x 2.28 in)
Cooling System:
Air-cooled
Horsepower:
Approximately 21-23 hp @ 7500 rpm (claimed)
Torque:
Approximately 14.5 lb-ft @ 6000 rpm (claimed)
Carburetor:
Mikuni VM30 (single, constant velocity)
Fuel Tank Capacity:
Approx. 10 Liters (2.6 US gal)
Oil Capacity:
Approx. 1.5 Liters (1.3 US qt)
Ignition Type:
CDI (Capacitor Discharge Ignition)
Oil Change Interval:
Recommended every 3,000 km (1,860 miles) or 6 months, whichever comes first.
Air Filter Cleaning:
Check and clean every 3,000 km (1,860 miles); replace as needed.
Spark Plug Replacement:
Recommended every 6,000 km (3,730 miles).
Engine Oil Type:
SAE 10W-40 API SE or SF, or SAE 20W-40 API SE or SF (refer to manual for specific viscosity based on ambient temperature).
Brake Fluid Type:
DOT 3 or DOT 4 (for hydraulic systems, if applicable to master cylinder).
Carburetor Tuning:
Mikuni carburetors can sometimes require periodic adjustment due to wear or environmental factors.
Electrical Connections:
Corrosion or loose connections in the aging electrical system can lead to intermittent faults.
Cam Chain Tensioner:
Wear in the cam chain tensioner can lead to engine noise; requires inspection and potential replacement.
Oem Parts Importance:
The availability of correct OEM part numbers is crucial for maintaining the original specifications and performance of the vintage SR250H.
Yamaha Legacy:
Yamaha Motor Company, founded in 1955, has a rich history in motorcycle manufacturing, known for innovation, performance, and reliability across various segments.
Sr Series Significance:
The SR series, including the SR250, represented Yamaha's push into the smaller displacement, practical motorcycle market, often favored for urban commuting and ease of use.
Sr250 Production Period:
The SR250 line saw production through various iterations and updates from the late 1970s into the early 2000s in different markets.
1981 Model Notes:
The 1981 SR250H was part of the initial wave of this model, often characterized by its classic styling and robust single-cylinder engine.
