The Polaris Sportsman 400 HO is an All-Terrain Vehicle (ATV) produced for the model years 2008 through 2010. Known for its versatility and capability, this ATV is designed for a wide range of uses, from recreational trail riding to utility work. The Sportsman line is a popular offering from a manufacturer with a long heritage in powersports. The 'HO' designation typically signifies a 'High Output' engine, indicating enhanced performance. This particular model features a 375cc, single-cylinder, 4-stroke engine with SOHC and four valves, paired with a Variable Transmission (PVT) system offering High, Low, Neutral, Reverse, and Park gears, along with On-Demand AWD. Its robust design includes a liquid-cooled engine, hydraulic disc brakes, and ample cargo capacity, making it a reliable choice for various terrains and tasks. This comprehensive Service Repair Manual for the Polaris Sportsman 400 HO (2008-2010) provides detailed information essential for maintenance, repair, and troubleshooting. Covering over 300 pages, the manual delves into all major systems, including engine mechanicals, fuel and ignition systems, cooling, exhaust, drivetrain, suspension, steering, braking, and electrical systems. It offers step-by-step instructions for disassembly and assembly, preventive maintenance schedules, diagnostic procedures, and specific adjustments. Furthermore, it includes crucial technical specifications, torque values, lubrication requirements, and detailed wiring diagrams. This resource is invaluable for ATV owners, mechanics, and technicians seeking to maintain the performance, reliability, and longevity of their Sportsman 400 HO. 🏷️ Basic Information Identification Make: Polaris Model: Sportsman 400 HO Year: 2008-2010 Product Type: Workshop Service Repair Manual 👋 Introduction Market Position Target Audience: ATV owners, mechanics, maintenance technicians. Value Proposition: Cost-effective solution for maintaining and repairing the Polaris Sportsman 400 HO. Competitive Analysis Competitor Alternatives: Official Polaris service manuals (often more expensive), generic ATV repair guides (less specific). Key Features Comprehensiveness: Covers all aspects of maintenance, repair, and troubleshooting. Clarity: Detailed step-by-step instructions and clear diagrams. Accessibility: Digital format allows for easy searching and access on various devices. 📋 Manual Details Coverage Areas Model Years Covered: 2008, 2009, 2010 Vehicle Type: All-Terrain Vehicle (ATV) Page Count Estimated Page Count: 300+ Manual Type Manual Type: Service Repair Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine Mechanical: Complete engine overhaul, cylinder head, piston, crankshaft, connecting rods, valve train, timing. Fuel System: Carburetor (carburetor troubleshooting, cleaning, adjustment, jetting), fuel pump, fuel tank, fuel lines. Ignition System: CDI unit, spark plugs, ignition coil, stator, wiring diagrams. Cooling System: Radiator, fan, thermostat, coolant, hoses, water pump. Exhaust System: Muffler, exhaust pipe, heat shields. Drivetrain: Transmission (gearbox disassembly, assembly, maintenance), final drive, differential. Drive System: Polaris Variable Transmission (PVT) clutch service (primary and secondary clutch maintenance, belt replacement, alignment), drive shafts, U-joints. Suspension: Front and rear suspension components, shocks, control arms, bushings, bearings. Steering System: Handlebars, steering shaft, tie rods, steering rack, universal joints. Braking System: Hydraulic brake system, brake calipers, master cylinders, brake lines, brake pads, rotors, bleeding procedures. Electrical System: Battery, charging system (alternator/stator), starter motor, lighting (headlights, taillights, brake lights), horn, switches, wiring diagrams. Chassis And Frame: Frame inspection, welds, component mounting. Bodywork And Trim: Fenders, plastics, seats, racks, decals. Special Tools: Required special tools for specific repairs and adjustments. Procedures Included Preventive Maintenance: Scheduled maintenance checks, lubrication points, filter replacements. Troubleshooting: Diagnostic procedures for common problems, symptom-based troubleshooting charts. Disassembly And Assembly: Step-by-step instructions for removing and reinstalling all major components. Torque Specifications: Detailed torque values for all critical fasteners. Adjustments: Carburetor adjustments, clutch adjustments, valve adjustments (if applicable). Lubrication: Specific lubricant types and intervals for all moving parts. Wiring Diagrams: Comprehensive electrical system wiring diagrams for easy fault finding. Technical Depth Depth Level: Comprehensive, from basic maintenance to complete engine and transmission rebuilds. Diagnostic Capabilities: Detailed diagnostic information for identifying and resolving issues. 📊 Manual Specifications File Format File Format: PDF Searchable Text: Yes Print Quality Print Quality: High-resolution, clear diagrams and text. Binding Type Binding Type: N/A (Digital) Paper Type Paper Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, SOHC, Liquid-Cooled, 4-Valve Engine Displacement: 375cc (approximate, 'HO' often denotes specific tuning) Bore X Stroke: Not explicitly stated in product info, requires manual lookup. Compression Ratio: Not explicitly stated in product info, requires manual lookup. Cylinder Arrangement: Single Cylinder Performance Horsepower: Varies by year and specific tuning, estimated 25-30 HP. Manual provides specifics. Torque: Varies by year. Manual provides specifics. Fuel System Fuel Delivery: Carburetor (specific model like Mikuni BSR36 or similar) Fuel Type: Unleaded gasoline Fuel Tank Capacity: Approximately 3.25 US gallons (12.3 liters). Manual confirms. 🔧 Transmission Standard Transmission Type: Automatic, Polaris Variable Transmission (PVT) with Engine Braking Optional Optional Transmission: N/A Features Gear Selection: High, Low, Neutral, Reverse, Park. Drive Modes: 2WD/4WD (On-Demand, AWD) Clutch System: Dual Clutch (Primary and Secondary) Transmission Fluid Type: Polaris Premium AGL Synthetic Gearcase Lubricant or equivalent. Manual specifies exact type and viscosity. 📐 Dimensions Exterior...