2008 Polaris Sportsman 500 H.O. / 500 EFI / X2 500 EFI / Touring 500 EFI Service Manual (P/N 9921315)

Polaris service manual P/N 9921315 (copyright 2007) covers the 2008 Sportsman 500 H.O. carbureted family (A08MH50AX/AZ), Sportsman 500 EFI (A08MN50AF/AN/AQ/AS/AX), Sportsman X2 500 EFI (A08TN50AX/AZ and A08TN50EA Quadricycle), and Sportsman Touring 500 EFI (A08DN50AF/AS/AZ and A08DN50EA Quadricycle).

Supplied as one 406-page PDF in a ZIP archive.

• Engine repair: EH50PLE engine removal, cylinder-head and valve-train work, piston inspection, crankcase overhaul, and final assembly with inspection limits and specifications.
• EFI and carburetor: Visteon EFI fuel-pressure testing, blink-code diagnosis, sensor testing, and TPS initialization; separate Mikuni BST 40 disassembly, cleaning, and adjustment procedures.
• PVT and transmission: Standard PVT and EBS clutch systems, belt and clutch alignment, drive- and driven-clutch overhaul, transmission removal, internal repair, and differential installation.
• Final drive: Centralized Hilliard and Active Descent Control front gearcases, ADC hydraulic-circuit bleeding, CV shaft and boot repair, prop shafts, U-joints, and hubs.
• Chassis and brakes: Model-specific body removal, A-arms, ball joints, steering posts, strut cartridges, hydraulic layouts, caliper repair, and master-cylinder replacement.
• Electrical diagnosis: Instrument-cluster and EFI diagnostic modes, AWD/ADC testing, charging and starter-system checks, and circuit-specific fault isolation for the different configurations.
• Wiring diagrams: Four complete, two-page sets with model-specific schematics and wire-color, gauge, termination, and connector-cavity tables for tracing circuits and connections.

Written primarily for certified Polaris Master Service Dealer technicians working in a properly equipped shop, this manual assumes a sound knowledge of mechanical theory, tool use, and shop procedures.

Model-Specific Repair and Maintenance

The opening tables identify each model code and distinguish carburetor from EFI, non-EBS from EBS clutching, and Centralized Hilliard from ADC front drive. They also separate standard Sportsman and X2/Touring brake and chassis layouts, plus domestic and Quadricycle equipment.

Those distinctions help prevent parts, specifications, or procedures from being taken from a similar-looking 500 model with different hardware.

Scheduled service: The maintenance chapter covers periodic schedules; front-gearcase, transmission, and ADC fluid service; compression and cooling-system pressure tests; oil and filter changes; oil-pump priming; and valve adjustment.

Chassis setup: Wheel alignment and toe setup, auxiliary-brake adjustment, and suspension preload are covered alongside model-specific lubricant and capacity tables.

EH50PLE Engine Repair

The EH50PLE chapter supports a complete mechanical teardown and rebuild, including crankshaft, counterbalancer, oil-pump, recoil, and final cam-timing work.

Internal inspection: Procedures cover cylinder honing, crankshaft straightening, cam-chain and automatic-compression-release inspection, valve-seat reconditioning, and piston and ring inspection. Crankcase separation is supported by bearing and end-play checks.

Oil-pressure testing and water-pump mechanical-seal replacement have their own procedures. Assembly references include fastener torque sequences, wear limits, clearance data, the EH50PL oil-flow diagram, engine exploded views, and a dedicated cylinder-head view.

Visteon EFI and Mikuni BST 40 Service

EFI coverage identifies the ECU and fuel-delivery components. Circuit diagrams support diagnosis of crankshaft position, manifold pressure, intake-air temperature, idle-air control, throttle position, and engine/coolant temperature, with separate power-on, fuel-pump, ignition-coil, and malfunction-indicator-light circuits.

Listed equipment includes Digital Wrench PU-47063, the PU-43506/PU-47476 fuel-pressure tools, and the 2201519 TPS tester. Some EFI checks remain dealer-tool functions, and the sealed ECU is treated as a replaceable unit rather than an internally serviceable component.

Fuel-system repair limits: The EFI fuel pump is replaced with the tank assembly; its pressure regulator and in-tank filter are not serviceable. The carbureted model has separate vacuum fuel-pump testing and repair procedures.

BST 40 carburetor: Its chapter documents carburetor operation and altitude and temperature jetting, followed by disassembly, cleaning, inspection, and assembly. Adjustment and testing cover float height, needle-and-seat leakage, and fuel level.

EFI fuel pressure can remain in the system with the engine stopped, so the publication requires pressure relief and appropriate fire-safety precautions before fuel-system service.

PVT Clutches, Transmission, and Final Drive

Clutch configurations: The carbureted 500 uses non-EBS PVT. Sportsman 500 EFI specifications distinguish Standard non-EBS and Deluxe EBS configurations; X2 and Touring models use EBS. Clutch repair includes bushing service and alignment with the 2872292 EBS alignment tool.

The drive-clutch retaining bolt is identified as a one-time-use fastener because removal can weaken it and reduce clamp load.

Transmission repair: Different exploded views show X2/Touring and carbureted layouts. Procedures cover removal, disassembly, inspection, reassembly, differential installation, and front-output-shaft backlash setup; the tool list includes the 2871695 backlash setting tool.

Transmission assembly cautions address rear-output-seal damage during differential installation, with separate X2/Touring instructions for the differential sliding geardog.

Front gearcases and shafts: Final-drive coverage includes ADC coil testing, gearcase piston service, ring-gear backlash, CV joints, and rear hubs. The ADC hydraulic operating view supports the hydraulic-circuit bleeding information.

Electrical Diagnosis and Wiring Diagrams

Fault isolation: Electrical coverage includes Power Distribution Module information for the carbureted model, a numbered AWD/speedometer fault-test series, cooling-fan checks, and X2/Touring differential-solenoid diagnosis. Lighting and sensor tests, ignition and charging-system testing, starter overhaul, battery testing, and basic winch wiring are also covered.

Key references include the EFI ignition testing flow chart, charging-system diagrams, separate EFI and carbureted starter-lockout diagrams, and the starter-system testing flow chart.

Wiring coverage: The four diagram sets cover Sportsman 500 carbureted, Sportsman 500 EFI, X2/Touring EFI, and X2 Quadricycle EFI systems. The international section adds Quadricycle braking, steering-lock, emissions, and turn/hazard-signal information.

PDF Navigation and Diagram Readability

Included pages: The total includes three introductory pages, seven Notes pages, two maintenance-record pages, five index pages, two blank pages, and eight wiring-diagram sheets. These pages are already included in the stated page count.

Text search and bookmarks: Main text sections are searchable, with embedded PDF bookmarks for chapters, procedures, the index, and wiring diagrams. Many diagram labels and the wiring-sheet contents are not searchable.

Small labels: The full wiring sheets and connection tables need enlargement for comfortable reading. Some fine labels in the color EFI troubleshooting illustrations remain soft or difficult to read when enlarged.