2011 Yamaha YZ450F(A) Owner's Service Manual (P/N 33D-28199-81-E0)

Yamaha's 2011 YZ450F(A) Owner's Service Manual, document number 33D-28199-81-E0, covers the US, Canadian, European, Australian, New Zealand, and South African versions of this competition model. Its eight chapters range from General Information and Specifications through regular inspection and adjustments to engine repair, Fuel System, Electrical, and chassis Tuning.

Text search, bookmarks, and wiring detail: Service text is searchable, with chapter and section bookmarks. The intake/exhaust pad-selection tables and the introductory reminder page are not text-searchable. Small wiring and connector labels are legible when enlarged.

• Engine repair: Engine removal and installation, cylinder-head service, camshaft timing, valve-clearance adjustment, crankcase splitting, and cylinder/piston inspection.

• Transmission and clutch: Wet-clutch repair, gear and shift-fork inspection, shift-cam service, and kick-shaft and shift-shaft procedures.

• Fuel system: Throttle body and injector service, fuel pump removal, fuel-pressure testing, and throttle position sensor adjustment.

• Chassis and suspension: Front fork rebuilds, brake caliper and master cylinder overhaul, steering-bearing replacement, and swingarm service.

• Electrical diagnosis: Wiring diagrams, ignition tests, sensor checks, and diagnostic code tables for the electronic fuel injection system.

• Factory specifications: Component-specific torque tables, fluid capacities, wear limits, lubrication diagrams, and cable routing diagrams.

Yamaha specifies prior servicing knowledge for the repair chapters and valve-clearance work; this manual is suited to mechanics and experienced owners who already have those skills.

Engine Repair and Cooling System

The liquid-cooled DOHC engine sections pair exploded diagrams with job instruction charts for disassembly, inspection, and reassembly. Coverage includes cylinder-head tightening sequences, camshaft and decompression-system checks, titanium valves, valve-clearance adjustment with pad selection tables, and cylinder/piston wear checks.

Crankshaft and balancer service includes installation tools and component-specific torque specifications. Oil pump inspection covers rotor clearances; water pump repair covers the impeller shaft, bearings, and seals, with radiator-cap and cooling-system pressure tests in the maintenance chapter.

The camshaft section flags uneven cap-bolt tightening as a cause of damage to the cylinder head, camshaft caps, and camshafts.

Fuel Injection Diagnostics and Regional Differences

The troubleshooting section cross-references FI fault codes with sensor operation tables, electrical test specifications, and component checks, helping distinguish connector or harness faults from failed sensors before parts are replaced.

Diagnosis uses Yamaha's FI diagnostic tool YU-03182/90890-03182 and sub-wire harness YU-03212/90890-03212. The vehicle has no battery, so this setup requires an external 12 V battery.

Coverage extends to malfunction-history retrieval and erasure, injector and ignition-coil actuation, and Power Tuner setting-history and map-erasure functions. Ignition diagnostics include the AC magneto, while the lean-angle sensor is identified as part of the ECU.

Regional differences: The specifications distinguish ECU models 33D0 (USA/Canada), 33D4 (Europe), and 33D6 (Australia/New Zealand/South Africa). Separate silencer-fiber replacement instructions distinguish the bolted US/Canadian assembly from the riveted versions sold elsewhere.

Front Fork Rebuilds and Rear Suspension Tuning

Front fork rebuild procedures cover the damper assembly, base valve, bushings, and seals. Suspension setting charts relate handling symptoms to spring selection, oil quantity, rebound damping, and compression damping, including the rear shock's separate low- and high-compression damping adjustments.

The fork assembly notes explain how a dropped damper assembly can damage the internal valve.

Rear shock coverage includes removal, spring replacement, bearing service, and adjustment, but not internal damper overhaul. Follow the factory handling precautions for its pressurized nitrogen-filled cylinder and reservoir.

English PDF and Included Opening Pages

Delivered as one printable English PDF with 225 pages total: 218 numbered chapter pages plus seven opening pages comprising the cover, one operating reminder, three introductory/how-to-use pages, and two contents pages. All seven opening pages are included in the total.