2009 Yamaha YZ450FY Service Manual

This manual details the maintenance and repair procedures for the 2009 Yamaha YZ450FY. It covers operation, inspection, and tuning with clear instructions and diagrams. PN LIT-11626-22-57

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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

Yamaha Models Covered & Key Technical Specifications

Models: Yamaha YZ450FY
Sub-models / Variants: USA, CDN, AUS, NZ, EUROPE, ZA
Trade Names: YZ450F, YZ450FY
Build Years: 2009
Serial Numbers: 34P1, 34P2, 34P4
Technical Data:

  • Engine: Liquid cooled 4-stroke, DOHC, single cylinder, 449 cm3
  • Compression ratio: 12.3:1
  • Starting system: Kickstarter
  • Transmission: Constant mesh, 5-speed, left foot operation
  • Cooling capacity: 0.99 L (0.87 Imp qt, 1.05 US qt)
  • Engine oil capacity: 0.95 L (periodic) to 1.2 L (total)
  • Spark plug gap: 0.7–0.8 mm (0.028–0.031 in)
  • Cylinder head bolt torque: 30 Nm, 20 Nm + 180° angle
Technical Specifications
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Document Number / Seller:
27782 / Carol Parker
File Size:
12.86 MB
File Type:
PDF
Language:
English
Pages:
276
Printable:
Yes
Category:
Motorbike
Last updated / verified
Feb 3, 2026

Yamaha Manual Features & Content Preview

Yamaha YZ450FY 2009 Service Documentation

  • Covers 2009 Yamaha YZ450FY, including USA, Canada, Australia, New Zealand, Europe, and South Africa market configurations
  • Official Yamaha publication P/N LIT-11626-22-57, 1st Edition, May 2008
  • Contains 47 pages of technical specification tables and 15 pages of wiring and cable routing diagrams for precise system maintenance
  • Accessible from your device as soon as the order is placed
  • Suitable for printing individual sections for shop-floor use
  • This 276-page OEM publication serves as the base reference for all 2009 YZ450FY race-prep and chassis tuning activities

Manual Content Summary

This 2009 Yamaha YZ450FY publication covers seven core chapters defining the factory maintenance requirements. The technical scope begins with general identification labels, chassis numbering, and pre-operation check sequences to ensure the machine remains race-ready. Detailed sections follow for engine disassembly and inspection, covering the liquid-cooled DOHC top-end, transmission gear mesh, clutch assembly, and lubrication system flow. Chassis documentation provides clear instruction on suspension tuning, brake hydraulic service, steering head maintenance, and drive chain slack management.

Technical Specification Preview

Engine data includes standard bore and stroke measurements of 95.0 x 63.4 mm and a 12.3:1 compression ratio. Torque values are cataloged extensively, documenting cylinder head assembly, crankshaft primary gear fixation at 110 Nm (80 ft-lb), and front axle nut tightening at 105 Nm (75 ft-lb). Electrical system data includes charging coil resistance values ranging from 44-66 ohms to 720-1080 ohms depending on the coil set. Fuel system specifications highlight the FCR-MX39 carburetor settings, including a #160 main jet and NFLR-3 jet needle. Cylinder head bolt torque values are documented in a multi-stage sequence, with final-stage angles of 180° specified in the engine assembly data. For more detail on structural maintenance, consult how factory workshop documentation is structured.

An official 276-page Yamaha OEM workshop manual covering the 2009 YZ450FY, documenting engine, chassis, electrical, and fuel-injection specifications for the 34P-series build.

Manual FAQ, Purchase & Download Details

Which system chapters contain the most comprehensive reference content in this service manual? keyboard_arrow_down

Manual is organized into seven distinct chapters including General Information, Specifications, Engine, Chassis, and Electrical, which collectively cover the primary mechanical and maintenance data.

Are there wiring diagrams and connector references included for the electrical components? keyboard_arrow_down

Chapter 6 of the document is dedicated to electrical components and specifically includes wiring diagrams to reference system layouts. It also contains sections regarding the ignition system and throttle position sensor system.

Is there a central table or section that provides information on tightening torques and fluid capacities? keyboard_arrow_down

Chapter 2 serves as the primary location for technical specifications, listing tightening torques, maintenance requirements, and lubrication diagrams for the machine.

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