Yamaha YF660FP ATV Service Manual | 2002-2008

This official service publication (P/N LIT-11616-15-01, Form 5KM-28197-E0) serves as the primary technical reference for keeping the 2002–2008 YFM660FP Grizzly series in peak operating condition. It details all periodic maintenance schedules, engine overhauls, and electrical diagnostics necessary for professional shop work or serious DIY maintenance.

• Covers liquid-cooled 660cc 4-stroke engines and V-belt automatic transmissions
• Contains 407 pages of raw technical data, including detailed torque tables, wiring schematics, and fluid-capacity charts

Component and System Documentation

The manual organizes information into ten dedicated chapters, stripping down every major system. Need to rebuild the top end? The engine section extensively covers the cylinder head, camshaft, valves, pistons, and both the primary and secondary sheaves. Drivetrain documentation explains the intricate operation of the front differential—specifically the 4WD and Diff-Lock modes—alongside rear final drive assemblies. Chassis tear-downs cover front and rear brake disc procedures, steering system alignments, and precise suspension settings.

Technical Specification Preview

Factory reference values take the guesswork out of your wrenching. The publication provides exact figures for the entire machine. For instance, cylinder head bolt torque is strictly documented at 38 Nm, while spark plugs require a snug 18 Nm. Engine idle speed sits comfortably at 1,450–1,550 r/min. If you are flushing the system, note the 1.8-liter total cooling capacity across all routes. Electrical diagnostics are just as precise, listing the ignition coil secondary winding resistance at 6.32–9.48 k-ohms at 68 degrees Fahrenheit (20 degrees Celsius). Working on high-torque ATV drivetrains and suspension systems carries inherent physical risks. Always verify your tools and environment, and consider bringing in certified professionals for complex electrical or high-pressure hydraulic work.