The KLX250S, produced for the 2009 and 2010 model years, is a versatile dual-sport motorcycle renowned for its lightweight, agile design, and capable off-road suspension. It features a liquid-cooled, DOHC, four-valve, single-cylinder engine displacing 249 cc, delivering a balance of power suitable for both trail riding and commuting. Known for its user-friendly nature and reliable performance, the KLX250S offers a compelling package that excels in various riding conditions, making it a popular choice among enthusiast riders. This comprehensive Factory Service Manual (FSM) provides in-depth coverage for the maintenance, repair, and servicing of the KLX250S (chassis code KLX250S, engine code prefix LX250F) for 2009-2010 models. It details engine mechanicals, fuel and ignition systems, cooling, lubrication, transmission, suspension, braking, and electrical systems. The manual includes routine maintenance procedures, troubleshooting guides, engine rebuild instructions, and technical specifications, serving as an essential resource for owners and technicians to ensure the optimal performance and longevity of their vehicle. 🏷️ Basic Information Identification Make: Kawasaki Model: KLX250S Model Years Covered: 2009, 2010 Codes Chassis Code: KLX250S Engine Code Prefix: LX250F 👋 Introduction Market Position Segment: Dual-sport/Off-road motorcycle Target Audience: Enthusiast riders, DIY mechanics, and service technicians. Competitive Analysis Competitors: Honda CRF250L (later model), Yamaha WR250R, Suzuki DR-Z250. Klx250S Advantage: Known for its user-friendly nature, capable off-road suspension, and reliable engine, making it a popular choice for trail riding and commuting. Key Features Design Philosophy: Lightweight, agile, and versatile for both on-road and off-road use. Engine Configuration: Liquid-cooled, DOHC, four-valve, single-cylinder engine. 📋 Manual Details Coverage Areas General Coverage: Complete service, repair, and maintenance for Kawasaki KLX250S models 2009-2010. Page Count Estimated Page Count: 500+ Manual Type Manual Type: Factory Service Manual (FSM) Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Engine disassembly, assembly, inspection, troubleshooting, and repair of all internal and external components. Fuel System: Carburetor (Keihin CVK34) tuning, disassembly, cleaning, repair, and adjustment. Ignition System: CDI ignition system, spark plug specifications, troubleshooting, and testing. Cooling System: Radiator, fan, thermostat, coolant specifications, and bleeding procedures. Lubrication System: Oil pump, oil passages, oil filter specifications, and oil change procedures. Transmission: Clutch operation, gearbox disassembly, assembly, inspection, and maintenance. Suspension Front: Inverted telescopic fork service, oil levels, seal replacement, and adjustments. Suspension Rear: Uni-Trak rear suspension, shock absorber service, linkage maintenance, and adjustments. Braking System: Hydraulic disc brakes (front and rear), caliper service, master cylinder, fluid specifications, bleeding procedures, and pad replacement. Electrical System: Wiring diagrams, lighting, charging system (stator, regulator/rectifier), battery specifications, starter motor, and fuse box. Frame And Bodywork: Frame inspection, handlebars, seat, fuel tank, fenders, and all body panel removal/installation. Wheels And Tires: Wheel bearing service, spoke tensioning, tire replacement, and pressure specifications. Procedures Included Routine Maintenance: Oil changes, filter replacements, chain adjustment, spark plug checks, air filter cleaning/replacement. Troubleshooting Guides: Diagnostic procedures for common and uncommon issues with detailed symptom-cause-remedy charts. Engine Rebuild: Complete procedures for cylinder head removal/installation, piston and ring replacement, crankshaft and connecting rod service. Suspension Overhaul: Detailed instructions for fork seal replacement, shock absorber servicing, and linkage bearing maintenance. Carburetor Tuning: Jetting adjustments, idle speed settings, pilot screw adjustments, and float bowl level checks. Electrical Diagnostics: Step-by-step testing of charging system, ignition system, lighting circuits, and starter system. Brake System Maintenance: Bleeding procedures, pad replacement, caliper piston service, and master cylinder rebuild. Technical Depth Depth: Comprehensive from basic adjustments and fluid changes to complete engine and transmission overhauls. Detail Level: Highly detailed with exploded views, torque specifications, and special tool requirements. 📊 Manual Specifications File Format File Format: PDF Searchability: Fully searchable text content for quick information retrieval. Print Quality Print Quality: High-resolution scans of original factory manual pages. Image Clarity: Clear, legible diagrams and photographs. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Four-stroke, DOHC, four-valve, single-cylinder Displacement: 249 cc (250 cc class) Bore X Stroke: 72.0 x 61.2 mm Compression Ratio: 11.0:1 Cooling Method: Liquid-cooled Performance Horsepower Est: Approximately 20-24 hp @ 7000 rpm (varies with emissions equipment and region) Torque Est: Approximately 15-18 lb-ft @ 6000 rpm (varies with emissions equipment and region) Fuel System Fuel Delivery: Carburetor: Keihin CVK34 with accelerator pump Fuel Type: Unleaded gasoline, minimum 87 octane Fuel Tank Capacity: 2.4 US gallons (9.1 L) 🔧 Transmission Standard Transmission Type: Constant mesh, 6-speed Clutch Type: Wet, multi-disc Final Drive: O-ring sealed chain Features Gear Ratios: Detailed gear ratios available in manual (e.g., 1st: 2.643, 2nd: 1.933, 3rd: 1.556, 4th: 1.333, 5th: 1.150, 6th: 1.000) Transmission Fluid: Refer to manual for specific type and capacity (typically motorcycle-specific gearbox oil). 📐 Dimensions Exterior Length: 86.8 in (2205 mm) Width: 32.1 in (815 mm) Height: 49.8 in (1265 mm) Wheelbase: 56.5 in (1435 mm) Ground Clearance: 11.0 in (280 mm) Seat Height: 34.8 in (885 mm) Weights Curb...