2003–2007 Yamaha Kodiak 450 YFM450FAT Owner's Manual (P/N LIT-11626-18-35, LIT-11616-16-01)

• Yamaha Kodiak 450 documentation for YFM450FAR, YFM450FAS, and YFM450FAT, plus the 2008 Grizzly 450 YFM45FGX service supplement. Includes FAT owner’s instructions and the base service manual required by the supplements.
• Engine repair covers removal, crankcase separation, valve-guide replacement and seat refacing, piston and crankshaft inspection, and camshaft timing.
• V-belt transmission procedures address primary and secondary sheave disassembly, centrifugal-clutch inspection, and internal transmission checks, including shift forks and gears.
• Shaft-drive service includes CV-joint and boot work, middle-gear shim selection, final-gear backlash measurement, and bearing and oil-seal replacement.
• Brake and chassis procedures cover master-cylinder and caliper overhaul, hydraulic bleeding, steering ball-joint replacement, and suspension removal and installation.
• Fuel and cooling chapters detail Mikuni BSR33 carburetor disassembly and fuel-level adjustment, radiator-cap pressure testing, thermostat checks, and water-pump seal replacement.
• Electrical troubleshooting follows ignition, starting, charging, cooling-fan, and On-Command 2WD/4WD/4WD-LOCK faults through component tests and model-specific wiring diagrams.

Manual Set and Model Coverage

The set contains 768 pages across two PDF files: a 194-page owner’s manual and a 574-page service compilation. The owner’s manual is the first edition, May 2004.

The FAS supplement appears twice; the duplicate adds no separate coverage. The supplements update the base repair procedures and are intended for use with the base manual and preceding supplements, not as standalone manuals.

Chassis coverage distinguishes the FAR swingarm and solid rear axle from the FAT’s independent rear double wishbones, CV shafts, and stabilizer. The FAS supplement adds differential-lock override-switch checks. The FGX supplement covers a wet multiple-plate rear brake inside the final gear case, rather than the earlier rear disc setup. That later section includes friction-plate wear and brake-plate warpage checks.

Diagnostic References and Repair Limits

“Coolant Flow Diagrams” and “Oil Flow Diagrams” trace the engine’s circulation systems. “Cable Routing” drawings show hose and harness placement, while the “2WD/4WD Selecting System” circuit diagram supports drive-selector fault tracing. Switch-continuity charts identify terminals for electrical checks. The FGX “Final Gear Case (Rear Brake)” exploded view shows the integrated brake assembly.

Electrical coverage includes DC-CDI ignition tests, starter-motor overhaul, and FGX headlight-relay troubleshooting.

The base manual covers differential-case repairs and gear-lash adjustments but prohibits disassembly of the factory-assembled internal differential unit and gear motor.

The backlash procedures warn that overtightening the ring-gear holding bolt can damage the ring gear. Brake overhaul instructions flag solvent cleaning as a cause of swollen or distorted seals.

Operational Content Overview

The owner’s manual covers safe operation and routine care of the YFM450FAT. It maps the VIN and model-label locations and explains the handlebar switches, drive selection, and auxiliary DC jack.

The text details starting procedures across various ambient temperatures and engine break-in requirements. Separate limits are provided for total vehicle load, carriers, towing, and trailer tongue weight. Off-road riding guidance, proper cleaning techniques, and long-term storage procedures sit alongside periodic maintenance schedules and basic starting and overheating troubleshooting.

Specification and Data Preview

Specification tables provide component-specific tightening torques, wear limits, and clearances, backed by gear-shim, tire-pressure, fluid-capacity, and electrical test data. Factory tool references include the YM-04134 sheave spring compressor and YM-01467 gear lash measurement tool.

Fluid recommendations distinguish the FAT’s SAE 80 API GL-4 hypoid final-gear oil from the FGX’s Yamaha Friction Modified Shaft Drive Gear Oil, P/N ACC-SHAFT-LU-00, for its wet-brake final drive.

Consult a qualified Yamaha technician before advanced repair work, particularly on brake systems or an ATV supported off the ground.