2003–2004 Yamaha Kodiak 400 4x4 Service & Repair Manual (P/N LIT-11626-16–02)

• Factory Yamaha two-manual set for the YFM400FAR Kodiak 400 4x4 Ultramatic, identified in the service specifications by model codes 5TE1 and 5TE5, with a liquid-cooled SOHC single-cylinder engine, Mikuni carburetion, and On-Command 2WD/4WD selection.
• Takes the engine and Ultramatic drive through major factory repair work: engine removal, cylinder-head and valve service, piston and cylinder inspection, crankshaft and oil-pump work, primary and secondary sheaves, centrifugal clutch, transmission, and middle gear.
• Documents 4WD driveline repair, including front CV joints, differential operation and gear-lash adjustment, rear axle and final-drive disassembly, pinion and ring-gear positioning, bearing replacement, and driveshaft checks.
• Covers chassis repair and adjustment for the front brake master cylinder and calipers, rear drum brake, hydraulic bleeding, steering stem, tie rods, steering knuckles, front arms, swingarm, shocks, wheel hubs, toe-in, and suspension inspection.
• Provides circuit diagrams and fault isolation for ignition, electric starting, charging, lighting, signal, cooling-fan, and 2WD/4WD selecting systems, plus the full YFM400FAR wiring diagram.
• Adds the owner-level operating baseline: control identification, drive-select and reverse operation, pre-operation checks, engine break-in, cargo and towing guidance, hill and water riding, routine maintenance, and troubleshooting charts.
• 553 PDF pages total — Service Manual: 366 pages, Yamaha publication no. LIT-11616-16-02; Owner’s Manual: 187 pages, Yamaha publication no. LIT-11626-16-02. Both publications are First Edition, April 2002.

Engine and Ultramatic Repair Coverage

The service manual is the dealer-style repair source for the YFM400FAR, not an owner-maintenance overview. It begins with machine identification, connection checks, special tools, general and maintenance specifications, torque tables, lubrication points, coolant and oil flow diagrams, and cable-routing views. The specification chapters provide component clearances, wear limits, fluid capacities, and electrical test values for the covered systems.

Engine coverage follows the 401 cc liquid-cooled SOHC single from removal through cylinder-head, camshaft, rocker-arm, valve, piston, and cylinder work. Separate sections address the recoil starter and A.C. magneto, crankcase separation, crankshaft and oil-pump service, transmission inspection, and middle-drive gear shimming and backlash measurement. The Mikuni BSR33 carburetor chapter covers disassembly, inspection, assembly, and fuel-level adjustment.

Ultramatic repair receives dedicated procedures for primary and secondary sheave removal, secondary-sheave disassembly and reassembly, clutch inspection, V-belt installation, and related wear checks. The special-tool index cross-references U.S./Canadian YM, YU, and YS numbers with 90890-series equivalents. Representative callouts include the secondary-sheave spring compressor YM-04134 / 90890-04134, crankcase separating tool YU-01135-A / 90890-01135, and gear-lash measurement tools YM-01467 / 90890-01467 and YM-01475 / 90890-01475.

Drivetrain, Chassis, and Electrical Diagnosis

Four-wheel-drive repair coverage moves from front CV joints and differential gear-lash setup to rear axle, final-drive, ring-and-pinion, bearing, and driveshaft work. The chassis chapters cover wheel hubs and brake discs, front brake pads, master-cylinder and caliper overhaul, rear brake service, steering-stem and tie-rod work, front arms, swingarm, and shock absorbers. Periodic procedures add brake bleeding, select-lever cable and shift-rod adjustment, toe-in adjustment, compression testing, ignition-timing checks, valve-clearance adjustment, battery testing, and fuse diagnosis.

Electrical repair is organized around actual circuits rather than a generic component list. The PDF provides separate circuit diagrams and troubleshooting sequences for the ignition, starter, charging, lighting, signal, cooling, and 2WD/4WD selecting systems. Switch-continuity checks, connector references, component test specifications, and the complete YFM400FAR wiring diagram support fault isolation. Exploded assembly views and job charts identify removal order, part names, lubrication points, locking-agent locations, replacement items, and component-specific torque requirements.

Owner’s Manual, Operating Baseline, and Scope

Before major repair work, the owner’s manual supplies the operating baseline needed to separate a control, adjustment, or maintenance issue from an internal fault. It explains the drive select lever, On-Command four-wheel drive, indicator lights, fuel controls, electric and recoil starting, pre-operation inspections, break-in, cargo and trailer use, and riding procedures for hills, slopes, shallow water, rough terrain, and skidding. Owner-level maintenance covers engine, final-drive, and differential oils; coolant; air filtration; the V-belt cooling duct; brakes; battery; fuses; and lighting.

The service manual assumes technician-level mechanical knowledge. Secondary-sheave work involves a compressed spring, and Yamaha specifies a fixed block, locknut wrench, and spring compressor rather than improvised restraint. Two driveline traps are stated plainly: insufficient gear lash is destructive to gear teeth, and the factory-assembled front differential gear unit should not be split because disassembly can cause malfunction. The manual also identifies left-hand-thread bearing retainers in the middle and final drives, helping prevent thread damage during repair.