Segment:
Entry-level sport motorcycle, popular for new riders and commuters.
Key Competitors:
Honda CBR250R, Yamaha YZF-R25 (in later markets), Suzuki GS500F (as a slightly larger competitor).
Rideability:
Known for its user-friendly ergonomics and accessible performance.
Styling:
Adopts the aggressive styling of Kawasaki's Ninja supersport lineage.
Target Audience:
Beginner motorcyclists, urban commuters, budget-conscious riders.
Engine And Drivetrain:
Engine disassembly/assembly, lubrication, cooling system, fuel system (carburetor tuning, injection systems if applicable), ignition system, exhaust system, transmission operation and repair, clutch, gearbox.
Chassis And Suspension:
Frame inspection and repair, front fork overhaul and adjustment, rear shock absorber and linkage service, wheel and tire service, brake system (front and rear disc brakes, fluid replacement, caliper overhaul), steering system.
Electrical System:
Wiring diagrams, battery maintenance, charging system (alternator/stator, regulator/rectifier), lighting (headlight, taillight, turn signals), ignition system components (CDI, coils), starter motor, instrumentation and gauges.
Bodywork And Trim:
Fairing removal and installation, seat maintenance, fuel tank service, fender service, trim piece replacement.
Maintenance:
Scheduled maintenance intervals, oil and filter changes, spark plug replacement, air filter cleaning/replacement, chain maintenance, brake fluid flush, coolant flush.
Troubleshooting:
Diagnostic procedures for common running issues, electrical faults, braking problems, and starting difficulties.
Repair And Overhaul:
Detailed step-by-step instructions for component disassembly, inspection, repair, and reassembly of major systems.
Specifications And Tolerances:
Torque specifications for critical fasteners, engine clearances, valve adjustments, suspension settings.
Depth Of Coverage:
Comprehensive, covering everything from routine maintenance to full engine rebuilds and advanced diagnostics.
Configuration:
Inline-twin, 4-stroke, DOHC, 8-valve
Bore X Stroke:
55.0 x 52.4 mm
Compression Ratio:
11.7:1
Horsepower:
Approx. 30-33 HP @ 10,500 rpm (depending on market and emissions regulations)
Torque:
Approx. 17-18 lb-ft @ 8,000 rpm
Induction:
Carbureted (dual Keihin CVK34 carburetors on most models, though some later markets may have had fuel injection)
Fuel Type:
Unleaded gasoline, minimum octane rating 87
Oil Type:
SAE 10W-40, API SG or higher, JASO MA certified motorcycle oil (refer to manual for specific grades)
Oil Capacity:
Approx. 1.6 L (with filter change)
Coolant:
Kawasaki Coolant or equivalent ethylene glycol-based coolant with distilled water (50/50 mix)
Crash Test Results:
N/A (Motorcycles typically do not undergo standardized car-like crash testing; focus is on design for rider control and protection).
Braking System:
Front: 290mm petal disc with dual-piston caliper; Rear: 220mm petal disc with dual-piston caliper. ABS was an optional feature on some models.
Lighting:
Halogen headlight, LED taillight.
Frame Construction:
High-tensile steel diamond frame for rigidity and handling.
Tires:
Front: 110/70-17; Rear: 130/70-17
Instrument Cluster:
Analog tachometer, digital speedometer, odometer, trip meter, fuel gauge, clock, and indicator lights.
ABS:
Available as an optional feature on select models/markets.
Charging Port:
N/A (Not typically equipped with factory charging ports).
Oil Change Interval:
Every 3,000-6,000 km (1,800-3,700 miles) or 6-12 months, whichever comes first (refer to manual for precise interval).
Air Filter Service:
Inspect every 3,000 km (1,800 miles), clean/replace as needed.
Spark Plug Replacement:
Typically every 10,000-15,000 km (6,000-9,000 miles) depending on plug type.
Chain Maintenance:
Lubricate and adjust every 1,000 km (600 miles) or as needed.
Brake Fluid Flush:
Every 2 years or as per manual recommendation.
Valve Clearance Check:
Initial check at 1,000 km (600 miles), then every 6,000 km (3,700 miles) or annually.
Engine Oil Grade:
SAE 10W-40 (JASO MA)
Coolant Type:
50/50 mix of ethylene glycol-based coolant and distilled water
Common Wear Items:
Clutch wear, chain and sprockets, brake pads, fork seals, regulator/rectifier (in some units).
Fuel System Maintenance:
Carburetor synchronization and cleaning can be critical for optimal performance, especially on older or high-mileage units.
Manufacturer:
Kawasaki Heavy Industries Motorcycle & Engine Company.
Ninja 250 Lineage:
The EX250 platform has been in production for decades, with the EX250J representing a significant update with fuel injection (on some models) and revised styling compared to earlier generations.
Production Years For Ex250J:
2008-2012
Manufacturing Locations:
Primarily Japan (for global markets).
