1987–2004 Yamaha Warrior 350, YFM350X ATV Factory Service & Repair Manual (P/N LIT-11616-YM-37)

• Factory Yamaha set P/N LIT-11616-YM-37: Combines the YFM350XA base service manual with Yamaha supplements for the YFM350XE, YFM350XJ, California YFM350XKC, YFM350XP, and YFM350S.
• Documents engine removal and full internal overhaul, including cylinder-head and valve work, piston and crankshaft inspection, transmission and shifter service, balancer timing, clutch repair, oil-pump inspection, and final engine assembly.
• Breaks down Mikuni carburetor repair with a labeled section view, removal, disassembly, inspection, assembly, installation, float-height adjustment, and fuel-level adjustment, plus California-specific calibration data where applicable.
• Details wheel hubs, rear axle, hydraulic disc brakes, steering, front suspension, swingarm, drive chain, and the gas-charged rear shock, with removal, inspection, installation, bleeding, and adjustment procedures.
• Provides starting, charging, ignition, lighting, and signal-system troubleshooting, switch and bulb continuity checks, circuit diagrams, cable-routing views, and model-specific wiring diagrams.
• Supplies component torque tables, fluid capacities, inspection and wear limits, clearance and adjustment data, electrical test values, and Yamaha special-tool numbers for the covered repair work.

This is a cumulative factory service set, not a stand-alone late-model supplement. Yamaha states that the publications were produced primarily for dealers and qualified mechanics and assume a basic understanding of mechanical concepts and machine-repair procedures. The material is therefore best suited to qualified technicians and experienced mechanics with the appropriate shop tools and test equipment.

Publication and Model Coverage

The shared Warrior front and rear covers add two pages, bringing the file to 403 PDF pages total. Each supplement contains changed service data and must be used with the preceding publications identified in its foreword.

Coverage is keyed to Yamaha suffixes, model codes, and identification numbers rather than one continuous serial-range chart. The XA section identifies model code 3GD5, starting vehicle number JY43GDW00*LC051101, and engine number 3GD-051101; the XE supplement identifies 3GDB, JY43GDA0*PA095101, and 3GD-095101. Later sections specify 3GDK for XJ, 3GDM for the California XKC, 5NF4 except California and 5NF5 for California on XP, and 5YT1 for USA/Oceania, 5YT2 for Canada, and 5YT3 for Europe on S. Match the frame model label before applying a supplement.

Repair Depth and Variant Changes

The base manual covers the air-cooled SOHC single-cylinder engine, wet multi-disc clutch, constant-mesh six-speed transmission with reverse, and chain final drive. Its overhaul chapter follows engine removal through crankcase separation, inspection, repair, reassembly, timing installation, and remounting.

Valve-seat and guide work, camshaft and rocker inspection, and cylinder and piston service receive dedicated procedures. Lower-engine coverage continues through the crankshaft and connecting rod, transmission and shifter, balancer, clutch, oil pump, bearings, and oil seals.

The supplements isolate later changes instead of repeating the base book. XJ adds revised starting and engine-revolution-limiter information; XKC separates California carburetor data; XP distinguishes California and non-California carburetion and updates piston, clutch, ignition, signal, and front-suspension information. The S publication adds the BSR36 Mikuni carburetor, revised body and cable routing, rear axle and hub work, front arms and shocks, rear brake service, gas-shock and swingarm procedures, battery service, electrical components, and its own wiring diagram. Component specifications can differ between the base manual and later supplements, so the applicable model section matters during repair.

Named visual references include the YFM350XA, YFM350XP, and YFM350S wiring diagrams, the electric-starting-system circuit diagram, the ignition-system circuit diagram, and the carburetor section view. Exploded assembly views are paired with job-instruction charts that identify part order, replacement items, lubrication and sealant points, and related torque references. Fault-finding sections address hard starting, poor idle or high-speed performance, shifting faults, clutch slip or drag, overheating, brake faults, shock problems, unstable handling, and lighting failures.

Special Tools and Repair Cautions

Special-tool callouts include the YU-90050 crankshaft installer set, YM-04019 valve spring compressor, YM-34487 dynamic spark tester, YU-03112 pocket tester, and model-specific rear-axle nut wrenches YM-37132 and YM-37134/90890-01498. Regional tool equivalents are identified where Yamaha used different numbers outside the United States and Canada.

The cautions are component-specific. The rear-axle procedure warns that striking the axle end directly can damage its threads and splines, while the starting-system diagnostic section warns that applying battery voltage to the CDI unit can damage it.

Brake repair, axle removal, and suspension work require the ATV to be securely supported. The rear shock and gas cylinder contain high-pressure nitrogen; Yamaha’s handling, disposal, and eye-protection requirements apply when working around these pressurized components.