Category:
Competition Motocross Motorcycle
Target Audience:
Motocross racers, off-road enthusiasts, and DIY motorcycle mechanics.
Competitors:
Yamaha YZ250F, Honda CRF250R, Suzuki RM-Z250
Engine Design:
High-revving, liquid-cooled, four-stroke single-cylinder engine.
Suspension:
Advanced front and rear suspension systems tuned for motocross performance.
Chassis Design:
Lightweight and rigid chassis for agility and handling.
Engine:
Detailed disassembly, assembly, inspection, and repair of the 250cc four-stroke engine, including cylinder head, piston, crankshaft, valve train, and lubrication system.
Fuel System:
Carburetor (Keihin MX Series) service, adjustment, troubleshooting, and component identification.
Cooling System:
Radiator, hoses, coolant specifications, and fan operation (if applicable).
Ignition System:
CDI unit, ignition coil, spark plug specifications, and troubleshooting ignition faults.
Transmission:
Gearbox disassembly, inspection, assembly, clutch operation, and transmission fluid specifications.
Drivetrain:
Chain and sprocket maintenance, inspection, and replacement procedures.
Chassis:
Frame inspection, fork (upside-down telescopic) disassembly, service, and tuning; rear shock absorber service and adjustment.
Brakes:
Front and rear hydraulic disc brake system service, including caliper disassembly, pad replacement, fluid bleeding, and master cylinder maintenance.
Wheels Tires:
Wheel bearing service, spoke tension adjustment, tire pressure recommendations, and common tire sizes.
Electrical System:
Wiring diagrams, battery maintenance, lighting system (if applicable), fuse identification, and basic troubleshooting.
Bodywork:
Plastic panel removal and installation, seat maintenance, and graphics application guidance.
Routine Maintenance:
Oil changes, filter replacements, chain lubrication and adjustment, air filter cleaning/replacement, spark plug checks, and general lubrication points.
Troubleshooting:
Systematic diagnostic procedures for common starting problems, engine performance issues, braking concerns, and electrical faults.
Disassembly Assembly:
Step-by-step instructions for the complete dismantling and reassembly of major motorcycle components.
Rebuilds:
Detailed guidance for engine top-end rebuilds, clutch replacement, and suspension overhauls.
Adjustments:
Carburetor jetting and adjustment, clutch lever play, brake lever travel, and suspension sag adjustments.
Depth Level:
Comprehensive, suitable for both home mechanics and professional technicians. Covers routine maintenance to complete engine and chassis overhauls.
Engine Type:
Liquid-cooled, four-stroke, DOHC, four-valve single cylinder
Displacement:
249 cc (15.2 cu. in.)
Bore X Stroke:
72.0 x 61.1 mm (2.83 x 2.41 in)
Compression Ratio:
12.5:1
Horsepower Estimated:
Approximately 38-40 HP (at crankshaft, peak)
Torque Estimated:
Approximately 20-22 lb-ft (at crankshaft, peak)
Carburetor:
Keihin MX36 (flat slide) with dual injectors
Fuel Type:
Unleaded gasoline, minimum octane rating 91
Oil Type:
SAE 10W-40 API SG or higher (check manual for specific recommendations)
Engine Oil Change:
Every 8-10 hours of riding or annually. Refer to manual for specific recommendations based on riding conditions.
Air Filter Cleaning:
After every few rides, or more frequently in dusty conditions. Check manual for detail.
Chain Lubrication Adjustment:
Before every ride or as needed. Check manual for correct slack.
Spark Plug Inspection:
Every 10-15 hours of riding.
Engine Oil Capacity:
1.0 L (1.1 US qt) without filter change; 1.1 L (1.2 US qt) with filter change.
Coolant Type:
High-quality coolant/antifreeze mixed with distilled water (50/50 ratio). Refer to manual for specific Kawasaki coolant part number.
Transmission Oil Type:
SAE 10W-40 API SG or higher (same as engine oil, or refer to manual for specific transmission oil if different).
Common Wear Items:
Clutch plates, piston rings, valve stem seals, wheel bearings, and chain/sprockets are common wear items in high-performance motocross bikes.
Carburetor Tuning:
Carburetor tuning can be sensitive to altitude, temperature, and humidity changes, requiring periodic adjustment for optimal performance.
Kawasaki Offroad:
Kawasaki has a long and successful history in off-road racing, particularly with its KX line, known for performance and innovation.
Kx250F Introduction:
The KX250F, as a four-stroke model, emerged as Kawasaki's response to the growing popularity of the 250cc four-stroke class, competing directly with established models from other Japanese manufacturers.
2004 Model Updates:
The 2004 model likely featured refinements over its predecessor, focusing on engine performance, suspension tuning, and chassis improvements based on race feedback.
Manufacturing Location:
Japan