2006 Yamaha YZ250F(W) Owner’s Service Manual PDF (P/N 5XC-28199-33)

Yamaha’s YZ250F(W) Owner’s Service Manual, publication 5XC-28199-33, is the first edition issued in August 2006. Its seven chapters cover operation, scheduled maintenance, repair, and closed-course race setup for the YZ250F and YZ250FW market variants.

• Engine and transmission: Engine removal, crankcase separation, top-end inspection, multi-disc wet-clutch repair, and transmission, shift cam, and shift fork service.

• Carburetor service: Keihin FCR-MX37 removal and disassembly, float and accelerator-pump inspection, hot-start components, and jetting adjustments.

• Cooling and lubrication: Radiator and cap pressure tests, water-pump and oil-pump inspection, oil-filter service, and lubrication diagrams.

• Brakes and chassis: Brake bleeding, caliper and master-cylinder disassembly, wheel-bearing replacement, steering inspection, and swingarm linkage service.

• Suspension: Front fork disassembly and rebuilding, rear-shock spring and bearing replacement, and compression, rebound, and preload adjustments.

• Ignition and TPS diagnosis: Wiring diagrams, connector views, fault-tracing charts, coil tests, and throttle position sensor replacement and adjustment.

Owners can use the operating and routine-maintenance sections; internal engine work and electrical testing call for mechanical experience, measuring equipment, and the specified service tools.

Engine Repair and Maintenance

Disassembly and reassembly: Exploded views and job instruction charts identify the required extent of removal, helping you avoid dismantling unrelated components. Internal coverage reaches the engine balancer, kick shaft, crankshaft, and crankcase bearings, with component-specific wear limits and tightening data.

Valve train: Intake and exhaust pad selection tables connect measured clearances to replacement shims. Camshaft inspection includes lobe geometry, bearing clearances, timing marks, and decompression-system checks. The camshaft procedures flag uneven cap-bolt loading as a cause of cylinder-head, cap, and camshaft damage.

Oil and coolant circuits: Water-pump procedures cover the impeller shaft, bearings, and seals. Oil-pump rotor measurements, oil-pressure checks, and oil-flow diagrams support lubrication-system inspection.

Keihin Carburetor Settings and Race Tuning

The carburetor tables distinguish U.S./Canadian settings from the other covered markets, including leak-jet specifications. Pilot-screw figures are examples: Yamaha notes that each unit was individually set at the factory.

Tuning charts relate throttle opening to jet and needle influence. The symptom-based setting table links poor throttle response and mixture symptoms to checks of the accelerator pump, fuel supply, and air filter.

Ignition Fault Tracing and TPS Testing

Ignition fault tracing separates no-spark checks for the stop switch, ignition coil, pickup and charging coils, neutral switch, and CDI unit. TPS testing adds connector illustrations, resistance checks, and input/output-voltage measurements to distinguish sensor faults from connection or supply problems.

Cable routing diagrams show harness and control-cable placement. Tool references include pocket tester YU-3112-C / 90890-03112. The TPS adjustment notes identify connector-seal damage and electrical shorts as risks of incorrect probing.

Brake Service and Suspension Setup

The chassis section provides suspension oil data, spring rates, and torque specifications for steering, braking, and swingarm components. Suspension setting charts address handling symptoms, with separate front-fork and rear-shock recommendations.

Rear-shock scope: Spring and mounting-bearing service is covered, but internal damper overhaul is not. Yamaha specifies assembly replacement for oil or gas leaks and warns against disassembling the nitrogen-charged cylinder or reservoir.

Brake and suspension work requires the specified tools and inspection checks; have a qualified technician handle work beyond your equipment or experience.

A Sample of Cylinder-Head and Piston Specifications

These examples represent a small selection of the manual’s engine inspection and assembly data.

The cylinder-head warpage limit is 0.05 mm. Standard piston-to-cylinder clearance is 0.030-0.055 mm, with a 0.1 mm service limit.

The M9 × 1.25 cylinder-head bolts have a final tightening torque of 38 Nm within the specified two-stage tightening procedure, which also includes bolt-thread and contact-surface lubrication instructions.

Searchable Four-Language PDF

Search, bookmarks, and wiring detail: The PDF has searchable text and bookmarks organized by language and section. Small wire-color codes and connector labels in the wiring diagram are legible when enlarged.

Supplied as one printable 676-page PDF in English, French, German, and Italian. The total includes 648 technical pages, 24 introductory and contents pages, front and back covers, and two blank pages.