Category:
Motocross / Off-Road Competition Motorcycle
Competitors:
Yamaha YZ250F, Honda CRF250R, KTM 250 SX-F, Suzuki RM-Z250
Performance Focus:
Designed for competitive motocross racing, emphasizing high-performance engine and agile chassis.
Engine:
Complete engine tear down, rebuild, including cylinder head, piston, connecting rod, crankshaft, transmission, lubrication system, cooling system, fuel injection system (EFI), ignition system.
Chassis:
Frame, suspension (forks, shock absorber), swingarm, steering, wheels, brakes (front and rear), controls, exhaust system.
Electrical:
Ignition system, charging system (stator, rectifier, battery), lighting, starter system (if applicable - though KX250F is kickstart), EFI system components (ECU, injectors, sensors).
Maintenance:
Scheduled maintenance, oil changes, filter replacements, chain adjustment, tire pressure, brake pad inspection/replacement, valve clearance checks and adjustment, coolant replacement.
Repair Rebuild:
Complete engine overhaul, transmission rebuild, suspension overhaul, brake system repair, fuel system diagnosis and repair, electrical troubleshooting.
Troubleshooting:
Diagnostic procedures for common problems, 'no spark', starting issues, performance problems, overheating, electrical faults, fuel delivery problems.
Depth:
Detailed technical information, including torque specifications for all fasteners, internal component measurements, clearances, tolerances, and assembly instructions.
Engine Type:
Liquid-cooled, four-stroke, DOHC, four-valve single-cylinder
Displacement:
249 cc (249 cubic centimeters)
Bore X Stroke:
77.0 mm x 53.6 mm (approximate, refer to manual for exact specification)
Compression Ratio:
13.5:1 (typical for this generation)
Horsepower Estimation:
Approximately 38-42 hp at the crankshaft (specific figures vary by test conditions and year; manual will provide official data)
Torque Estimation:
Approximately 20-22 lb-ft at the crankshaft (specific figures vary; manual will provide official data)
Fuel Delivery:
Electronic Fuel Injection (EFI) - Keihin 43mm throttle body
Ignition:
Digital CDI with electric timing advance
Fuel Type:
Unleaded gasoline, 91 octane or higher recommended
Engine Oil Type:
SAE 10W-40 motorcycle specific, API SG or higher (manual will list exact specifications and capacities).
Length:
Approx. 85.7 in (2177 mm)
Width:
Approx. 32.3 in (820 mm)
Height:
Approx. 49.4 in (1255 mm)
Curb Weight:
Approx. 231.7 lb (105.1 kg) (wet weight)
Fuel Capacity:
Approx. 1.6 US gal (6.1 L)
Wheelbase:
Approx. 58.3 in (1481 mm)
Type:
Not Applicable (Competition Motorcycle)
Braking System:
Hydraulic disc brakes front and rear.
Suspension Features:
Adjustable front forks (e.g., Showa Separate Function Fork - Big Piston) and adjustable rear shock absorber (e.g., Showa unit-cam, pre-load, compression, rebound damping).
Features:
None (This is a competition motocross bike, designed for performance, not comfort or infotainment).
Features:
None (This is a competition motocross bike, designed for rider input and control, not electronic assistance).
Oil Change Interval:
Refer to manual for specific hours/miles, but typically after every few rides for competition use.
Air Filter Cleaning:
Frequent checks and cleaning/replacement recommended, especially in dusty conditions.
Valve Clearance Check:
Intervals typically measured in hours of operation (e.g., 10-20 hours for initial checks, then as needed based on performance).
Coolant Type:
High-quality, permanent type ethylene glycol based coolant, mixed 50/50 with distilled water. (Manual will specify exact type and capacity).
Brake Fluid Type:
DOT 4 hydraulic brake fluid (Manual will specify exact type and flush intervals).
Efi Tuning:
Early EFI models sometimes required specific tuning for optimal performance in different conditions, addressed via ECU couplers or tuning tools. Manual covers EFI system diagnostics.
Clutch Wear:
Clutch plates can wear depending on riding style and frequency of use. Manual details clutch inspection and replacement procedures.
Suspension Maintenance:
Regular fork seal and oil service is crucial for maintaining optimal suspension performance.
Kawasaki Motocross:
Kawasaki has a long and successful history in professional motocross racing, with the KX line being a cornerstone of their performance off-road offerings.
Kx250F Development:
The KX250F has seen continuous development, with major updates in this generation focusing on engine performance, chassis refinement, and the transition to Fuel Injection.
Production Location:
Japan (typically)