2000 Polaris Trail Boss 325 ATV Service & Repair Manual (P/N 9915978)

This Polaris service manual covers the 2000 Trail Boss 325 ATV, model codes A00AA32CA and A00AA32AA, with ES32PFE02/04 four-stroke engines. The publication number is 9915978, and the pages are dated 8/99.

• Engine repair: Engine removal, cylinder-head and bottom-end disassembly, valve-seat reconditioning, camshaft timing, oil-pump inspection, and reassembly.

• Fuel system: Mikuni BST 31 carburetor overhaul, float-height adjustment, needle-and-seat leak testing, fuel-pump testing, and mixture troubleshooting.

• PVT and transmission: Drive and driven clutch service, bushing replacement, belt alignment, and Type III EZ-Shift transmission disassembly, inspection, and assembly.

• Chassis and final drive: MacPherson strut and ball-joint replacement, concentric swingarm service, rear-axle bearing replacement, and steering alignment.

• Hydraulic brakes: Master-cylinder and caliper repair, separate hand- and foot-brake bleeding, disc inspection, and brake-drag diagnosis.

• Electrical diagnosis: Ignition, charging, starter, and oil-cooler fan tests, plus wiring diagrams and reverse-speed-limiter troubleshooting.

This manual is suited to technicians familiar with engine measurements and electrical testing; the PVT chapter specifically requires Polaris-authorized technicians who have completed the manufacturer's service training.

Engine Service and Lubrication

The periodic maintenance chart separates engine, electrical, and chassis work and identifies more frequent service for severe use. General and component-specific torque tables accompany the service procedures.

Internal engine repair covers piston and cylinder measurements, connecting-rod bearing clearance, crankshaft end play, and cylinder-head reconditioning. Camshaft timing instructions distinguish between an installed and removed stator, with illustrations for both setups.

Oil-pressure testing is paired with the Oil Flow Diagram – ES32PF and oil-cooler thermo-valve operation. Valve-seat work calls for Cylinder Head Reconditioning Kit P/N 2200634 and experience with reconditioning techniques.

BST 31 Carburetor and Fuel Delivery

Separate ES32PFE02 and ES32PFE04 jetting charts distinguish the engine configurations. The Fuel Flow Diagrams trace the supply circuit, while carburetor inspections address the diaphragm, vacuum slide, jet needle, and needle seat.

Needle-seat pressure tests and fuel-pump vacuum tests help distinguish a leaking carburetor inlet from a failed pump diaphragm before selecting parts.

Clutch and EZ-Shift Transmission Service

Clutch procedures cover springs, shift weights, spider rollers, and Teflon-coated bushings, supported by exploded views and the specified pullers and fixtures. The assembly notes identify the bushings as self-lubricating and prohibit oil or grease.

Transmission troubleshooting separates shift-linkage faults from internal gear and bearing problems. The Type III Transmission Exploded View accompanies the assembly instructions.

Gen II Chassis and Dual Hydraulic Brakes

Suspension procedures include strut-cartridge replacement and ball-joint service with tool kit P/N 2870871, plus concentric swingarm removal and installation. The rear-axle section covers tapered bearings, seals, and the eccentric housing.

The manual warns that overtightening the eccentric clamp bolts can cause premature bearing failure.

The Cutaway View of DH Caliper explains the separate hand- and foot-brake circuits within the rear caliper. Brake repair extends to piston and seal inspection, master-cylinder assembly, and bleeding.

Review the full manufacturer's procedures and safety precautions before work involving spring-loaded clutch parts, raised vehicles, or hydraulic brakes.

Ignition, Starting, and Fan-Circuit Diagnosis

Fault-finding charts cover no-spark conditions, charging-system output, and starter-circuit voltage drops. The Typical Ignition Timing Curve and 2000 Trail Boss 325 Wiring Diagram support the electrical checks.

Dedicated procedures address the LR44-3 reverse limiter, Electronic Throttle Control (ETC) switch, and LR60 oil-cooler fan control, including thermistor and fan-motor testing.

Valve Clearance and Lubrication Data Preview

For the ES32PFE engine, the valve-adjustment section specifies 0.006 in. (0.15 mm) for both intake and exhaust, checked cold at TDC on the compression stroke.

The oil-change procedure lists 14 ft-lb (19 Nm) for the crankcase drain plug. Transmission lubrication data gives a capacity of 11.3 oz. (335 ml), alongside lubricant selection and level-check instructions.

Search, Bookmarks, and Wiring-Diagram Detail

Text search and diagram viewing: An OCR text layer supports searches through the service chapters, with recognition errors in some text and diagram labels. Embedded bookmarks link to the chapters, wiring diagram, and index; small wiring labels require zooming, and the main schematic is best viewed rotated.

Supplied as one printable 302-page PDF in English, including the five-page index and 18 blank pages.