Polaris Predator 500 ATV Service Manual 2003 (P/N 9918062)

Polaris factory service manual P/N 9918062 covers the 2003 Predator 500, including the standard and Troy Lee Limited Edition models. The separately published owner’s manual and parts manual are not included.

PDF Search, Chapter Bookmarks and Page Count

Search and wiring detail: Main chapter text is searchable, and eight embedded PDF bookmarks link to the chapter index and all seven chapters. Some specification-table entries and most wiring-diagram labels are not searchable. Small wire codes, component labels and connector details are legible when enlarged.

The ZIP download contains one printable, 193-page PDF. This total includes both covers, a one-page foreword, one safety page, a one-page chapter index, a four-page alphabetical index, one blank page and four notes pages.

Engine Repair, FOX Shocks and Electrical Diagnosis

These selected highlights are not a complete table of contents. Other topics include spark-arrestor maintenance and accessory tether-switch testing.

• Engine repair: Step-by-step removal, disassembly and reassembly procedures, cylinder-head and valve service, piston inspection, crankcase work, water-pump seal replacement and cam-timing setup.

• Clutch and transmission: Wet multi-plate clutch inspection, gearset removal and installation, shift-drum and fork inspection, bearing checks and reassembly verification.

• Mikuni BSR 42 carburetor: CV-system operation, jetting guidance, disassembly, cleaning, float adjustment, needle-and-seat leakage testing, fuel-pump service and rich/lean troubleshooting.

• Chassis and FOX shocks: Steering, front hubs, ball joints, A-arms, concentric swingarm and rear axle service, plus separate front- and rear-shock rebuilding procedures.

• Hydraulic brakes: Fluid replacement and bleeding, master-cylinder removal and installation, pad replacement, disc inspection, caliper repair and brake-noise diagnosis.

• Electrical troubleshooting: DC/CDI ignition tests, stator and charging checks, starter-motor repair, switch tests, diagnostic flowcharts and the vehicle wiring diagram.

• Routine service: Scheduled inspections, lubrication charts, oil and filter changes, air-filtration service, control adjustments, drive-chain maintenance and suspension settings.

The manual is written primarily for certified Polaris Master Service Dealer technicians working in a properly equipped shop; some procedures require mechanical theory, established shop skills and special tools.

Maintenance and Workshop Reference

The maintenance schedule distinguishes normal operation from severe use, including racing, mud, water and sand. Lubricant and sealant product numbers, component-specific torque tables, wear limits and Polaris/SPX special-tool listings support service planning.

Steering coverage includes both string and chalk methods for checking toe alignment. Control service addresses clutch freeplay, throttle-cable routing and the relationship between idle adjustment and Electronic Throttle Control operation.

Engine and Transmission Repair Depth

The ES50PL engine section, with engine designation ES50PLE01, reaches the camshafts, automatic compression release, cam-chain tensioner, valve guides and seats, adjusting-pad selection, piston rings, crankshaft, balancer and crankcase bearings. Cylinder honing, valve-guide replacement and valve-seat reconditioning are also addressed.

Reassembly material explains bearing orientation, crankcase sealing, piston and ring placement, cylinder-head tightening sequences, primary-drive installation and final rotating-assembly checks. The ES50PL oil-flow chart and cam-timing diagram illustrate lubrication paths and indexed timing relationships.

Clutch and gearbox: Internal inspection covers friction discs, pressure plates, shaft splines, gear teeth, shift dogs, forks and the shift drum. The PA-46087 crankcase separator is listed for crankshaft removal. Press-fit crankshaft rebuilding information is referred to a separate rebuilding manual, which is not included.

Cooling and lubrication: Coverage includes cooling-system and radiator-cap pressure tests, cooling-system bleeding, oil-pressure testing and oil-pump priming. The 2872105 water-pump mechanical-seal puller supports seal replacement with the engine installed; pump-shaft replacement requires engine removal and crankcase separation.

Incorrect cam timing can cause valve-to-piston contact, while reused or distorted piston-pin circlips can cause severe engine damage.

Carburetor Circuits and Fuel-Pump Diagnosis

The BSR 42 chapter explains starter-enrichment, pilot, main, float and vent circuits before the repair procedures. Altitude- and temperature-based jetting guidance and Mikuni main- and pilot-jet references accompany the carburetor exploded view.

Inspection distinguishes needle and needle-jet wear from inlet-valve leakage and diaphragm problems. Fuel-level checking is described where the drain fitting is accessible, alongside fuel-pump vacuum testing and diaphragm service. The 2872314 float-adjustment tool is identified.

Steering, Axles and FOX Shock Rebuilding

Chassis procedures address body-panel removal, steering-knuckle and ball-joint replacement, front-hub bearings, steering-post service, swingarm bearings and rear-axle assembly. Exploded views show the relationship between hubs, spacers, seals and retaining hardware.

Separate FOX front- and rear-shock sections cover seal and bearing work, internal floating piston positioning, bleeding, nitrogen recharging and final movement checks. Front-shock material includes typical and optional valving information; rear-shock coverage includes compression/rebound components and a standard valving chart. The 2871351 FOX shock IFP depth tool is listed.

Valve-stack order affects damping, and a shock shaft allowed to spin in its holding clamps can suffer permanent damage and develop leaks.

Brake Service and Electrical Fault Isolation

The hydraulic brake-system schematic explains reservoir venting, the compensating port and floating-caliper operation. Repair coverage extends to caliper seals and pistons, disc thickness and runout checks, brake-drag diagnosis and post-service checks.

Electrical sections combine ignition-timing inspection, neutral/fan/ETC switch tests, battery testing, lamp and switch service, starter-brush and armature inspection, and one-way starter-clutch checks. The ES50PL alternator exploded view accompanies ignition, charging and starter-system flowcharts.

Those flowcharts connect symptoms with component and wiring tests, helping distinguish a connection fault from a failed ignition, charging or starter component. Test specifications reference the PV-43568 Fluke 77 digital multimeter.

FOX shock service involves high-pressure nitrogen, while fuel and brake work introduces fire, vapor, pressure and finish-damage hazards. Use the specified tools, protective equipment, ventilation, vehicle support and system depressurization practices before beginning those repairs.

Oil-Pressure and Carburetor-Setting Examples

The ES50PL lubrication section specifies oil pressure at 5,500 rpm with the engine hot and Polaris PS-4 Synthetic oil: 20 psi standard and 12 psi minimum.

For the Mikuni BSR 42, float height is 13–14 mm, measured from the float-bowl mating surface to the top step of the float without compressing the inlet-needle spring.