Yamaha Grizzly 660 2002-2008 Service Manual (P/N 90890-01309)

• Covers the 2002–2008 Yamaha Grizzly 660 (YFM660F) equipped with the 660cc liquid-cooled 4-stroke SOHC engine and V-belt automatic transmission
• Official Yamaha publication P/N 90890-01309
• Features over 80 mechanical exploded-view diagrams
• Includes comprehensive maintenance torque tables for all critical engine and chassis fasteners
• Spans 466 pages of dedicated factory reference material, detailing specialized 4WD and differential lock system diagnostics

Operational and Service Documentation

Dive straight into the mechanical core of the 2002–2008 Yamaha Grizzly 660. This factory publication breaks down the drivetrain, chassis, and electrical systems with absolute clarity. It moves from basic machine identification right into heavy component analysis. You get a complete breakdown of the 5KM-series engine architecture and the 3-axle transmission mechanism. Need to trace a fluid issue? The manual maps out exact lubrication points, coolant flow paths, and detailed oil flow diagrams. It also covers the specific parking-position shift mechanism introduced for this model year. Beyond basic periodic maintenance, the chapters walk you through complex electrical circuit troubleshooting and high-level internal engine evaluations. Working on ATV drivetrains carries inherent physical risks. Always follow the documented factory safety procedures before lifting the vehicle or dismantling high-tension components.

Specification and Reference Highlights

Guesswork has no place in the shop. This manual provides the hard technical specifications required for serious bench work, covering critical clearances, fluid capacities, and fastener torque ratings. For example, cylinder head bolt torque is strictly documented at 38 Nm. Critical spark plug gap settings are listed at 0.8–0.9 mm. You will find exact fluid requirements, including a 1.8-liter coolant system capacity and a 1.9-liter engine oil specification for periodic changes. Precision matters when rebuilding the drive system. The documentation details exact differential gear backlash settings, specified right at 0.05–0.25 mm, so you can lock in factory-standard tolerances across the entire YFM660F series.