2007 Yamaha YZ85W1 Service & Repair Manual (P/N 5PA-28197-10)

This Yamaha factory service manual covers the 2007 Yamaha YZ85W1, identified by model code 5PAG (USA). Yamaha publication references: LIT-11616-20-08 and 5PA-28197-10.

• Engine and transmission: Engine removal, top-end rebuilds, crankcase separation, crankshaft inspection, wet-clutch service, and transmission disassembly and reassembly.

• Carburetor and intake: PWK28 Keihin carburetor disassembly, float adjustment, reed valve inspection, and jetting charts for different operating conditions.

• Cooling system: Radiator and cap pressure testing, cooling-system leak checks, and water-pump impeller, shaft, bearing, and seal service.

• Brakes and steering: Front and rear master-cylinder and caliper repair, hydraulic brake bleeding, wheel-bearing service, and steering head bearing replacement.

• Suspension and final drive: Telescopic fork overhaul, rear-shock inspection and adjustment, swingarm linkage service, and drive-chain and sprocket checks.

• Electrical diagnosis: CDI ignition troubleshooting, coil testing, engine stop switch continuity checks, wiring diagrams, and connector and cable-routing views.

Written primarily for Yamaha dealers and qualified mechanics, this manual assumes an understanding of mechanics and the repair techniques used on these vehicles.

Engine, Clutch and Transmission Repair

Engine coverage extends from cylinder-head inspection and piston-ring checks to crankshaft installation. The piston/cylinder matching chart links cylinder grades A–D to piston markings and colors, helping identify the matching piston before ordering replacement parts.

The crankcase procedures specify separating tool 90890-01135 / YU-1135-A. Their handling cautions address damage to gasket mating surfaces from hammer blows. Exploded assembly views identify parts, lubrication points, and items requiring replacement.

Clutch procedures distinguish the friction-plate types and pressure-plate alignment marks. Transmission coverage includes gear ratios, shift-fork orientation, shift-drum inspection, and checks of the kick starter and shift shaft mechanisms.

Carburetor Service and Track Tuning

The tuning chapter connects jet selection with throttle opening, air temperature, humidity, altitude, and track surface. Carburetor setting charts include symptom-based guidance and alternative jets and needles with part numbers.

Maintenance coverage provides race-based service schedules, premix requirements, air-filter servicing, and silencer-fiber replacement.

Radiator and Water-Pump Checks

Cooling checks distinguish radiator-cap opening-pressure testing from a separate pressure test for system leaks. Water-pump repair covers impeller and drive-gear inspection, bearing installation, and seal-lip protection during shaft installation.

Brakes, Forks and Rear Suspension

Chassis specifications identify the semi-double cradle frame and link-type Monocross rear suspension. Front-fork procedures cover damper rods, bushings, and oil seals; suspension setting matrices relate handling symptoms to damping, spring selection, and fork oil level.

Rear-shock coverage includes removal, inspection, replacement, spring work, and external adjustments. Internal shock rebuilding is not covered. Follow Yamaha's handling warnings for the nitrogen-charged shock and gas cylinder.

Brake repair sections address master-cylinder and caliper internals. The manual warns that solvents can swell and distort the caliper piston seals.

Ignition Fault Tracing and Wiring References

Coil-resistance tests, stop-switch continuity checks, and wiring checks are linked in the no-spark/intermittent-spark diagnostic flowchart. This helps isolate faults before the chart calls for CDI-unit replacement.

Wiring diagrams include connector layouts and wire-color references; separate cable-routing views support reassembly. The troubleshooting chapter also addresses starting failures, poor running, gear-shifting faults, clutch problems, overheating, and unstable handling.

Examples of Lubrication, Ignition and Fastener Data

These examples represent a small selection of the manual's service data. Transmission-oil specifications distinguish a 0.50 L periodic oil change from the 0.55 L total quantity.

The CDI magneto pickup-coil test specifies 248–372 ohms at 20°C (68°F), measured between the white/red and white/blue leads.

The torque tables list 79 Nm for the primary drive gear nut and 90 Nm for the rear wheel axle nut.

PDF Navigation, Wiring Detail and Page Count

Text search and diagram detail: Searchable text and embedded chapter and section bookmarks support reference work. Small wiring-diagram labels require zooming for comfortable reading.

A single printable, English-language PDF download with 248 pages total, including the cover and front matter. The final two pages contain monochrome and color versions of the wiring diagram; the additional color page is already included in the total.