2006 Yamaha YZ85 / YZ85LW Owner's Service Manual PDF (P/N 5PA-28199-84)

Yamaha's 2006 YZ85 / YZ85LW Owner's Service Manual, publication 5PA-28199-84, covers operation, maintenance, repair, and tuning of the standard and large-wheel competition models, including YZ85V and YZ85LWV.

• Engine and transmission: Top-end overhaul, crankcase separation, crankshaft inspection, clutch service, and transmission repair involving the shift cam and shift forks.

• Carburetor and reed valve: PWK28 carburetor disassembly, jet and needle inspection, float-height adjustment, reed inspection, and reassembly.

• Cooling system: Radiator removal, radiator-cap and cooling-system pressure tests, plus water-pump shaft, bearing, and seal replacement.

• Brakes and wheels: Master-cylinder and caliper overhaul, brake bleeding, disc inspection, and wheel-bearing replacement.

• Suspension and chassis: Front-fork oil-seal replacement, steering service, swingarm and linkage inspection, and rear-shock spring replacement and adjustment.

• Ignition diagnosis: CDI magneto service, wiring diagrams, an ignition inspection flowchart, and component-specific resistance checks.

• Race preparation and tuning: Maintenance schedules, pre-operation inspections, carburetor setting charts, sprocket selection, and suspension setting charts.

The operating and basic maintenance sections are for owners; the internal repair procedures suit mechanics with the specified service tools. Yamaha recommends dealer service for the front fork.

Identification and Model Differences

The identification pages locate the frame VIN, engine serial number, and model label. Specifications distinguish regional model codes and the standard and LW wheel, suspension spring, and final-drive configurations.

Engine Repair and Assembly References

Top-end coverage includes cylinder wear measurements and the A–D piston/cylinder matching chart, which helps select the correct piston grade before a rebuild. Yamaha specifically cautions against reboring the cylinder.

Crankcase and transmission sections address shaft removal, gear inspection, and operational checks after assembly. Exploded diagrams and job instruction charts identify parts and removal scope; sectional views clarify details such as circlip orientation.

Tool references include crankcase separator YU-1135-A / 90890-01135 and clutch holder YM-91042 / 90890-04086. Fastener tables identify the component, thread size, and tightening torque.

Carburetor and Cooling Service

Carburetor procedures cover the jets, needle valve, and float assembly. The venturi block is excluded from disassembly because disturbing it can reduce carburetor performance.

Cooling inspections distinguish radiator-cap operation from system leakage. Water-pump reassembly notes flag the risk of damaging the oil-seal lip when fitting the impeller shaft.

Brake and Suspension Work

Brake procedures cover piston and seal inspection, hydraulic reassembly, bleeding, and leak checks. Linkage service distinguishes the relay arm's Polylube bearing and explains the treatment of bearings, seals, and collars.

The fork assembly notes warn that allowing the damper rod to drop into the inner tube can damage the internal valve.

Rear-shock service limits: Procedures cover removal, inspection, spring replacement, and external adjustment. The pressurized cylinder and nitrogen reservoir must not be disassembled.

Follow Yamaha's safety precautions for brake and suspension work, and have tasks beyond your experience handled by a qualified technician.

Ignition Diagnosis and Wiring

The electrical section traces a no-spark fault through wiring connections, the engine stop switch, ignition coil, plug cap, pickup coil, and charging coils to the CDI unit. Wiring and cable-routing diagrams identify lead colors, connector arrangements, and routing locations.

Track Setup and Tuning Charts

Throttle-opening charts explain which carburetor circuits affect each operating range. Track-condition examples connect jetting choices with engine behavior, while suspension charts relate bottoming, poor grip, and other handling symptoms to the relevant checks and adjustments.

Separate spring-option tables distinguish standard and LW configurations and regional rear-spring specifications, helping avoid a mismatched spring choice.

A Preview of Engine and Gearing Specifications

These are a few of the engine and drivetrain specifications included in the manual. Cylinder-head combustion chamber capacity is 7.14 cm³, and standard piston-to-cylinder clearance is 0.040–0.045 mm.

Total coolant capacity, including all routes, is 0.54 L. The primary drive gear retaining nut has a tightening specification of 79 Nm.

Standard secondary gearing is 47/14 for YZ85 models in the USA and South Africa, or 48/14 for Europe, Canada, Australia, and New Zealand. The YZ85LW uses 52/14.

PDF Navigation, Languages and Page Count

Text search and diagram detail: Main text is searchable, with bookmarks grouped by language. Some embedded diagram labels are not searchable; small wiring and connector labels are readable when enlarged.

One printable, 506-page PDF download contains English, French, and German text. The total covers all three languages and already includes both covers, 22 introductory and contents pages, three memo pages, and two blank pages.