Yamaha Warrior 350 ATV Service & Owner’s Manual Set, 1991–2003 (P/N LIT-11616-07-50)

The YFM350XA manual provides the base repair procedures. The four factory supplements document model changes and identify which earlier publications to use alongside them. All of those references are included in the service PDF.

The supplements provide model-specific changes to the base procedures. The separate YFM350XL(C) owner's manual covers operation, preventive maintenance, and minor repairs.

PDF Search, Bookmarks, and Wiring Detail

Search and diagram readability: Both PDFs have chapter bookmarks. Text search is available in the YFM350XP supplement only. Small connector labels and wire-color codes in the wiring diagrams are easier to read when enlarged. Some labels in the base manual's signal-system diagram remain grainy at higher zoom.

The ZIP contains two PDFs totaling 505 pages, with 337 pages in the service PDF and 168 in the owner's PDF. The totals include the six front covers, five blank pages, three pages with only a heading or page number, the owner's two-page safety card, and three additional pages in the owner's PDF.

Engine Overhaul, Electrical Diagnosis, and ATV Maintenance

The items below are selected examples. The service manual also covers compression testing and ignition timing checks.

• Engine overhaul: Step-by-step engine removal and installation, cylinder-head and valve service, camshaft and timing-chain work, and piston, ring, and crankshaft inspection.

• Clutch and transmission: Wet-clutch service, crankcase separation, oil-pump clearance and gear checks, and disassembly, inspection, and reassembly of the forward/reverse transmission and shift mechanism.

• Carburetor service: Mikuni BTM36SH disassembly, inspection, reassembly, and fuel-level adjustment, with separate calibration data in the California YFM350XKC supplement.

• Electrical diagnosis: CDI ignition, electric-starting interlocks, charging, lighting, and switch-continuity tests, with fault-isolation charts and model-specific wiring diagrams.

• Chassis and brakes: Wheel and hub service, hydraulic disc-brake bleeding, steering inspection and toe-in adjustment, suspension service, and drive-chain inspection and adjustment.

• Operation and maintenance: Pre-ride checks, cold and warm starting, shifting and drive selection, parking, riding on slopes and rough terrain, and scheduled maintenance.

Yamaha wrote the service publications primarily for dealer mechanics with a working knowledge of ATV repair. The owner's manual is written for riders carrying out pre-ride checks, preventive maintenance, and minor repairs.

Engine Assembly and Special Tools

Exploded views identify the decompression cam, valve guides, rocker arms, connecting rod, starter drive, primary drive, balancer, bearings, and seals. The Lubrication Diagrams, torque tables, and timing marks show where the assembly specifications apply. The Carburetor Section View identifies the starter, pilot, float, and accelerator-pump circuits.

Factory tools listed include the YU-01135 crankcase separator with YM-1382 adapter, YM-04019 valve spring compressor, YM-01404 flywheel puller, YM-37132 rear axle nut wrench, and YM-34487 dynamic spark tester.

The manual specifies new piston-pin circlips and shows their orientation relative to thrust because a displaced clip can damage the piston or cylinder. It also warns that spinning a cleaned bearing dry with compressed air can damage its running surfaces.

Model Changes and Electrical Diagnosis

The XE supplement revises identification data, specifications, Cable Routing, and throttle-cable adjustment. The XJ supplement updates engine and maintenance data and shows how the parking-brake switch activates the ignition rev limiter. The XKC supplement adds California carburetor settings and maintenance intervals. The XP supplement revises clutch and ignition data and covers front suspension, rear brake-light switch adjustment, and signal-system checks.

The electric starting circuit diagram and Starting Circuit Operation section show how the cut-off relay, clutch switch, neutral switch, and drive-select switch interact. The accompanying tests help distinguish an interlock fault from a starter motor or relay fault. Full wiring diagrams are included for the XA, XJ, and XP service coverage.

Brake and Rear Suspension Service

The chassis chapter covers master-cylinder and caliper disassembly, plus rear shock and swingarm removal, inspection, and installation. Rear shock coverage includes preload adjustment and handling and disposal of the pressurized assembly. Yamaha warns against opening or heating the nitrogen-charged shock or reservoir.

Owner Controls and Routine Maintenance

The owner's manual covers the throttle and speed limiter, clutch and brake controls, fuel controls, seat, and shock adjustments. It explains break-in, loading, hill and side-slope riding, shallow-water crossings, and sliding or skidding. Six reproduced warning and specification labels cover passenger restrictions, drive selection, tire pressure and load, the rear shock, minimum rider age, and general ATV hazards.

Maintenance coverage includes engine oil, spark plug, air filter, carburetor and idle adjustment, brake pads and fluid, parking brake, clutch free play, chain and pivot lubrication, battery, fuse, headlight, and spark arrester. It also includes cleaning, storage, a troubleshooting chart, and specifications for fluids, tires, chassis, drivetrain, and electrical equipment.

Clutch Wear and Ignition Test Preview

The YFM350XA clutch inspection lists a standard friction-plate thickness of 2.94–3.06 mm and a wear limit of 2.8 mm. Both figures are in the clutch inspection section for comparing measured plates with the factory specifications.

The YFM350XP ignition troubleshooting chart gives a pickup-coil resistance of 459–561 Ω at 20°C (68°F), a model-specific reference for checking the magneto pickup during ignition diagnosis.