2005–2008 Yamaha Grizzly 80, YFM80GT ATV Factory Service Manual (P/N LIT-11616-08-19, LIT-11616-18-47)

• Exact document set: a 252-page PDF built around the August 2004 YFM80GT supplement LIT-11616-18-47 for the YFM80GT Grizzly 80, model code 2D31, with the Yamaha YFM80(D) base manual and YFM80M/YFM80MC supplement included.
• GT-specific service updates: covers machine identification, revised engine/chassis/electrical specifications, cable and hose routing, periodic maintenance, front and rear body-panel removal, speed-limiter adjustment, air-filter service, spark-arrester cleaning, and handlebar installation.
• Engine and carburetor repair depth: documents engine removal, cylinder-head and cylinder disassembly, piston and valve-train inspection, cam-chain service, clutch and starter-clutch work, oil-pump service, CDI magneto removal, crankcase and transmission repair, crankshaft inspection, and carburetor disassembly and fuel-level adjustment.
• Chassis and driveline procedures: provides removal, inspection, installation, and adjustment coverage for the front and rear brakes, wheels and bearings, steering system, front suspension, rear shock and swingarm, final-drive components, and shaft-drive assembly.
• Electrical testing and fault isolation: supplies switch and bulb checks, ignition, electric-starting, charging, starter-motor, and signal-system diagnosis, backed by circuit diagrams and troubleshooting charts for hard starting, poor running, shifting faults, clutch problems, overheating, braking, shock-absorber faults, and unstable handling.
• Factory reference data and tools: includes component-specific torque tables, lubrication data, capacities, wear limits, clearances, electrical test specifications, Yamaha special-tool numbers, job charts, cable-routing drawings, and exploded assembly views.

Document Set and Coverage

This PDF contains three Yamaha factory publications totaling 252 pages. The YFM80GT supplement accounts for 34 pages. The YFM80M/YFM80MC supplement accounts for 15 pages when its appended wiring sheet is included, while the YFM80(D) base manual accounts for 203 pages including its wiring sheet and back cover.

The document numbers are LIT-11616-18-47 / 2D3-28197-10 for the YFM80GT supplement, LIT-11616-13-28 / 4EM-28197-21 for the YFM80M/YFM80MC supplement, and LIT-11616-08-19 / 4EM-28197-20 for the YFM80(D) service manual. Yamaha designed the GT publication as an update rather than a stand-alone repair manual. It specifically directs the technician to the two earlier publications for procedures that were not repeated. Both supporting manuals are contained in this PDF, so the referenced engine, carburetion, chassis, electrical, and troubleshooting material is present in the same file.

Factory Procedures and Reference Drawings

Removal and disassembly sections begin with exploded views and job-instruction charts that identify parts, quantities, notes, and the intended order of work before the detailed procedure text. The periodic service chapters go beyond routine fluid changes, covering cam-chain tension, valve-clearance checks, ignition timing, compression testing, clutch and brake adjustment, brake-lining inspection, final-gear service, toe-in, wheel-bearing checks, battery inspection, and fuse testing.

Named references include the engine lubrication diagram, GT cable- and hose-routing views, the YFM80(D) Wiring Diagram, the YFM80M/YFM80MC Wiring Diagram, and circuit diagrams for the ignition, electric-starting, charging, and signal systems. The electrical chapters pair those schematics with coupler and switch checks, continuity tests, resistance specifications, and system-specific fault trees rather than stopping at a single overall wiring page.

Specifications, Special Tools, and Repair Traps

The specification chapters collect general dimensions, maintenance limits, tightening torques, lubricant requirements, inspection measurements, carburetor settings, brake and steering data, and electrical baselines for the covered assemblies. The special-tool section identifies Yamaha equipment and part numbers, including the compression gauge 90890-03081 with adapter 90890-04082, universal clutch holder 90890-04086, rotor puller 90890-01189, and pocket tester 90890-03112.

The crankcase section requires transmission operation to be checked before the crankcase screws are torqued and identifies the correct positions of the black friction plate and bent clutch plate; errors in either area can leave the transmission or clutch binding after reassembly. The oil-pump section separately warns that dry passages can damage the engine on initial start-up.

This material assumes practical mechanical knowledge. Brake, steering, engine-internal, and electrical repair procedures should be carried out with the specified tools and suitable experience, or reviewed by a qualified Yamaha technician before the ATV is returned to service.