Production Years Covered:
1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990
Segment:
Dual-purpose motorcycle, often referred to as a 'street scrambler' or 'retro-style' motorcycle.
Competitors Era:
Competed against other Japanese manufacturers' offerings in the dual-purpose segment, such as certain Honda XL series or Kawasaki KLR models of the time.
Versatility:
Designed for both on-road commuting and light off-road use, offering a balance of practicality and adventure.
Design Philosophy:
Emphasized reliability, ease of maintenance, and a classic aesthetic.
Engine Mechanical:
Full engine disassembly, inspection, repair, and reassembly procedures.
Engine Electrical:
Ignition system, charging system, starting system, wiring diagrams, component testing.
Fuel System:
Carburetor overhaul, fuel pump, fuel lines, fuel tank maintenance.
Transmission:
Clutch operation, gearbox disassembly, inspection, and repair.
Suspension:
Front fork service, rear shock absorber maintenance, linkage adjustments.
Brakes:
Front and rear brake system maintenance, bleeding procedures, component replacement.
Cooling System:
Radiator service, coolant replacement, thermostat testing (if applicable).
Exhaust System:
Muffler and pipe inspection, repair, and replacement guidance.
Chassis Frame:
Frame inspection, steering head bearing service, swingarm maintenance.
Bodywork Fittings:
Fairing removal and installation, seat maintenance, minor bodywork adjustments.
Electrical Diagnostics:
Troubleshooting common electrical faults using schematics.
Routine Maintenance:
Oil changes, filter replacements, chain adjustment, spark plug service, lubrication points.
Troubleshooting Guides:
Diagnostic charts for common running problems and system failures.
Major Repairs:
Engine rebuilds, transmission overhauls, suspension component replacement.
Diagnostic Procedures:
Step-by-step instructions for diagnosing faults in various systems.
Adjustment Procedures:
Carburetor synchronization, valve clearance adjustment, cable adjustments.
Depth Level:
Comprehensive rebuild and diagnostic capability.
Diagnostic Tools:
Requires standard motorcycle mechanic tools, multimeters for electrical testing, and potentially specialized carburetor adjustment tools.
Engine Type:
Four-stroke, SOHC, air-cooled, parallel-twin cylinder.
Displacement:
233 cc (Actual displacement may vary slightly by specific model year or variant, but this is the typical specification).
Bore X Stroke:
Typically around 49.0 mm x 66.0 mm. (Precise figures will be in the manual).
Compression Ratio:
Likely in the range of 8.9:1 to 9.5:1. (Manual will confirm exact ratio).
Horsepower Est:
Estimated 18-22 hp @ 7000-8000 rpm. (Exact figures confirmed in manual).
Torque Est:
Estimated 1.5-1.8 kgf-m @ 5000-6000 rpm. (Exact figures confirmed in manual).
Carburetor Type:
Twin Mikuni VM-series carburetors, likely 26mm or 28mm. (Specific model confirmed in manual).
Fuel Capacity:
Approximately 9-10 liters (2.4-2.6 US gallons). (Confirmed in manual).
Oil Capacity:
Around 1.8-2.0 liters with filter change. (Confirmed in manual).
Oil Type Spec:
Yamaha recommends SAE 20W-40 or SAE 10W-30 API SE or SF service classification oil. (Confirm specific recommendation in manual).
Overall Length:
Approximately 2100-2150 mm. (Exact measurement in manual).
Overall Width:
Approximately 800-850 mm. (Exact measurement in manual).
Overall Height:
Approximately 1200-1250 mm. (Exact measurement in manual).
Wheelbase:
Approximately 1390-1410 mm. (Exact measurement in manual).
Dry Weight:
Around 130-135 kg. (Confirmed in manual).
Wet Weight:
Approximately 145-150 kg with all fluids. (Confirmed in manual).
Front Tire Size:
Commonly 3.00-21 or 90/90-21. (Confirm specific size in manual).
Rear Tire Size:
Commonly 4.60-17 or 110/90-17. (Confirm specific size in manual).
Front Wheel Type:
Spoked wheel.
Rear Wheel Type:
Spoked wheel.
Safety Ratings Era:
Motorcycle safety standards and ratings in this era were less stringent and standardized than modern vehicles; emphasis was on mechanical integrity.
Braking System:
Disc brake on front, drum brake on rear. (Some later models may have offered dual discs, but the classic BR250F usually has a disc/drum setup).
Lighting:
Headlight, taillight, brake lights, turn signals.
Infotainment Systems:
Basic for its era: analog speedometer, tachometer, odometer, neutral indicator, high beam indicator, turn signal indicators.
Rider Assistance:
None typical for the era (e.g., no ABS, traction control).
Connectivity Features:
None.
Oil Change Interval:
Every 3,000 km (approx. 1,800 miles) or 6 months, whichever comes first. (Refer to manual for exact interval and conditions).
Air Filter Cleaning:
Every 3,000 km or as needed, depending on operating conditions. (Manual provides detailed cleaning instructions).
Spark Plug Replacement:
Every 6,000 km (approx. 3,600 miles) or annually. (Manual specifies plug type and gap).
Valve Clearance Check:
Typically every 6,000 km (approx. 3,600 miles). (Crucial procedure detailed in manual).
Engine Oil Viscosity:
SAE 20W-40 or SAE 10W-30 (API SE/SF).
Transmission Oil Viscosity:
SAE 80W (API GL-4).
Brake Fluid Type:
DOT 3 or DOT 4 (Check manual for specific recommendation, especially for clutch actuation if hydraulically operated).
Common Wear Items:
Worn clutch plates, carburation issues due to age and dirt ingress, aging electrical connections, fork seal leaks, chain and sprockets wear.
Carburetor Maintenance:
Regular cleaning and synchronization of the twin carburetors is key for smooth running due to their age. Fuel quality and storage can affect them.
Electrical Reliability:
Older wiring can degrade; checking grounds and connectors is important. The manual's wiring diagrams are invaluable for troubleshooting.
Yamaha Motorcycles:
Yamaha Motor Company is a renowned Japanese manufacturer with a long history of producing high-quality motorcycles, known for innovation and performance across various categories.
Br250 Lineage:
The BR250 series, including the BR250F, evolved from Yamaha's earlier dual-purpose and trail bikes, offering a blend of performance and usability for riders of the period.
Manufacturing Origin:
Japan.
