2009 Yamaha YZ450FY Service & Repair Manual (P/N LIT-11626-22-57)
276 Pages • 12.86 MB • Instant, Printable PDF
Yamaha Models Covered & Key Technical Specifications
Models: Yamaha YZ450FY
Sub-models / Variants: USA, CDN, AUS, NZ, EUROPE, ZA
Trade Names: YZ450F, YZ450FY
Model 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
Yamaha Manual Features & Content Preview
- Applies to all 2009 Yamaha YZ450FY market configurations (USA, Canada, Australia, New Zealand, Europe, and South Africa)
- Official Yamaha publication P/N LIT-11626-22-57, 1st Edition, May 2008
- Includes 47 pages of technical specification tables and 15 pages of accurate wiring and cable routing diagrams
- This 276-page OEM publication serves as the base reference for all 34P-series race-prep, engine teardowns, and chassis tuning
Manual Content Summary
This factory publication spans seven core chapters outlining the exact maintenance protocols required by Yamaha. It opens with general identification, chassis numbering, and pre-ride checklists to keep the machine race-ready. From there, it dives into full engine disassembly and inspection procedures—covering the liquid-cooled DOHC top-end, transmission gear mesh, clutch pack, and lubrication routing. On the chassis side, you get clear factory guidance on suspension tuning, brake hydraulic service, steering head bearing maintenance, and drive chain slack management. Always observe proper shop safety practices, use appropriate support stands, and follow sequence guidelines to ensure safe operation and prevent component damage.
Technical Specification Preview
The manual provides the exact factory tolerances needed for precision work. Engine data lists the standard bore and stroke at 95.0 x 63.4 mm alongside the 12.3:1 compression ratio. Torque specs are heavily documented throughout: cylinder head assembly sequences, crankshaft primary gear fixation (110 Nm / 80 ft-lb), and front axle nut tightening (105 Nm / 75 ft-lb). Electrical testing data outlines charging coil resistance values, ranging from 44-66 ohms up to 720-1080 ohms depending on the specific stator coil. Fuel delivery specs break down the FCR-MX39 carburetor settings, calling out the #160 main jet and NFLR-3 jet needle. Cylinder head bolt torque values are shown in a multi-stage sequence, including the critical 180° final-stage angle. For further context on standard shop procedures, review how factory workshop documentation is structured.
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