The Ninja EX250, also known as the Ninja 250R, is a popular entry-level sportbike that has been a favorite among new riders and budget-conscious enthusiasts since its introduction. Produced for the 2008 through 2012 model years, this second-generation model (chassis code EX250J) features a 249 cc liquid-cooled parallel-twin engine, a 6-speed transmission, and a lightweight, high-tensile steel perimeter frame. Its sporty styling, fuel efficiency, and affordability make it an appealing choice for those seeking an accessible and enjoyable riding experience. The reputation for engineering quality and reliability is evident in the Ninja EX250's design, offering a balance of performance and ease of use. This comprehensive full service and repair manual provides detailed guidance for maintaining and repairing the Ninja EX250 (EX250J) models from 2008 to 2012. It covers a wide range of essential topics, including in-depth engine overhaul procedures, transmission and drivetrain maintenance, chassis and suspension adjustments, brake system servicing, and complete electrical system diagnostics. The manual also details routine maintenance schedules, troubleshooting guides for common issues, and step-by-step instructions for repairs, ensuring that owners and technicians can effectively keep the motorcycle in optimal condition. With clear explanations and high-resolution diagrams, this manual serves as an indispensable resource for preserving the performance and longevity of your Ninja EX250. 🏷️ Basic Information Identification Make: Kawasaki Model: Ninja EX250 Model Code: EX250J (2008-2012) Generation Generation Designation: Second Generation (Ninja 250R) Codes Chassis Code: EX250J 👋 Introduction Market Position Vehicle Segment: Entry-level sportbike, lightweight sportbike, beginner sportbike. Target Demographic: New riders, commuters, budget-conscious enthusiasts. Competitive Analysis Key Competitors: Honda CBR250R, Yamaha YZF-R25/R3 (though later model years), Suzuki GS500F (larger displacement but similar price point). Key Features Vehicle Appeal: Affordability, fuel efficiency, ease of use, sporty styling, low running costs. Manual Value Proposition: Enables owners to perform essential maintenance and repairs, extending vehicle life and saving on labor costs. 📋 Manual Details Coverage Areas Covered Years: 2008, 2009, 2010, 2011, 2012 Page Count Estimated Page Count: Approximately 300-500 (typical for this type of manual) Manual Type Manual Type: Full Service and Repair Manual Language Language: English Format Format: Digital (likely PDF) 📖 Manual Coverage Systems Covered Engine Systems: Engine overhaul, cylinder head, valve train, crankshaft, pistons, lubrication system, cooling system, fuel injection system (EFI), ignition system, starting system. Transmission Drivetrain: Clutch, gearbox, shift mechanism, final drive chain and sprockets. Chassis Suspension: Front fork assembly, rear shock absorber, swingarm, steering system, frame. Braking System: Front and rear brake calipers, master cylinders, brake lines, brake fluid, rotor maintenance. Electrical System: Wiring diagrams, battery, charging system (alternator/stator, rectifier/regulator), lighting (headlight, tail light, signals), instrumentation, sensors, ECU (Engine Control Unit) troubleshooting. Fuel System: Fuel tank, fuel pump, fuel injectors, fuel pressure regulator, throttle body assembly. Exhaust System: Exhaust pipes, muffler, catalytic converter (if applicable). Bodywork Fittings: Fairings, seat, fuel tank cover, fenders, mirrors, controls. Procedures Included Maintenance Procedures: Oil changes, filter replacements, chain adjustment and lubrication, spark plug replacement, air filter cleaning/replacement, coolant checks and changes, brake pad inspection and replacement, tire pressure checks. Troubleshooting Diagnostics: Step-by-step diagnostic flowcharts for common issues, error code interpretation (if applicable), component testing procedures. Repair Procedures: Detailed instructions for engine rebuilds, transmission overhauls, suspension component replacement, electrical system repairs, body panel removal and installation. Calibration Adjustments: Throttle position sensor (TPS) adjustment, idle speed adjustment, chain slack adjustment, suspension adjustments. Technical Depth Depth Of Coverage: Comprehensive (covering routine maintenance to full engine and chassis rebuilds, including electrical diagnostics and EFI system troubleshooting). Diagnostic Tools: Information on required special tools and diagnostic equipment, though likely not specific ECU diagnostic software instructions for aftermarket manuals. 📊 Manual Specifications File Format File Format: PDF (Portable Document Format) Searchability: Likely text-searchable if created from digital source or high-quality OCR. Print Quality Image Resolution: High-resolution diagrams and illustrations for clarity. Binding Type Binding Type: N/A (for digital format) Paper Type Paper Type: N/A (for digital format) ⚙️ Engine Specifications Primary Engine Engine Type: Four-stroke, liquid-cooled, DOHC, parallel-twin Displacement: 249 cc (cubic centimeters) Bore X Stroke: 55.0 x 52.4 mm (millimeters) Compression Ratio: 11.0:1 Valve Train: DOHC, 8 valves (2 per cylinder) Performance Horsepower Est: Approximately 30-34 PS (22-25 kW) at 10,500 RPM Torque Est: Approximately 20-22 Nm (15-16 lb-ft) at 8,000 RPM Fuel System Fuel Delivery: Fuel Injection (DFI - Digital Fuel Injection) Fuel Type: Unleaded gasoline, minimum 87 octane Throttle Control: Cable-actuated throttle body 🔧 Transmission Standard Transmission Type: 6-speed constant mesh Features Clutch Type: Wet, multiple-disc Final Drive: O-ring sealed chain Gear Ratios: Refer to manual for specific ratios (typically close-ratio for sporty feel) 📐 Dimensions Exterior Length Overall: Approximately 2,005 mm (78.9 in) Width Overall: Approximately 745 mm (29.3 in) Height Overall: Approximately 1,095 mm (43.1 in) Wheelbase: Approximately 1,370 mm (53.9 in) Ground Clearance: Approximately 155 mm (6.1 in) Weights Dry Weight: Approximately 150 kg (331 lbs) Curb Weight: Approximately 168 kg (370 lbs)...