2005 Yamaha YZ250FV / YZ250F Owner's Service Manual (P/N LIT-11626-19-72)

This Yamaha Owner’s Service Manual (P/N LIT-11626-19-72, first edition August 2005; cover code 5XC-28199-12) covers the 2005 YZ250FV for the USA, Canada, Australia, and New Zealand, and the YZ250F for Europe and South Africa.

Text search and navigation: The technical chapters have searchable text, with embedded PDF bookmarks for all seven chapters and major service sections. The safety-notice and warranty pages are not searchable. Small wiring-diagram labels require zooming.

• Engine repair: Engine removal, cylinder-head and piston inspection, camshaft timing, valve-clearance adjustment, and crankcase and crankshaft disassembly.

• Clutch and transmission: Wet multi-disc clutch inspection and assembly, shift cam and shift fork service, and kickstarter mechanism repair.

• Fuel and cooling: FCR-MX37 carburetor overhaul, accelerator-pump adjustment, radiator-cap and cooling-system pressure checks, and water-pump inspection.

• Chassis and brakes: Telescopic fork rebuilds, oil-seal replacement, steering-head and swingarm service, brake caliper and master-cylinder repair, and brake bleeding.

• Electrical diagnosis: Wiring and cable-routing diagrams, ignition fault tracing, throttle position sensor testing, and sensor replacement and adjustment.

• Maintenance and tuning: Maintenance-interval charts, pre-operation checks, carburetor and suspension tuning, component-specific torque tables, and inspection limits.

The routine-maintenance sections suit experienced owners, while internal repair requires mechanical experience and the specified tools; Yamaha recommends dealer service for front-fork work.

Engine Repair and Maintenance

Exploded diagrams and sequential job instruction charts accompany disassembly and inspection. DOHC valve-train coverage includes camshaft-to-cap clearance checks, decompression-system inspection, timing-chain tensioner testing, and separate intake and exhaust valve pad selection tables.

Crankcase work covers crankshaft measurement, removal, and installation. Special-tool references include crankcase separating tool YU-1135-A / 90890-01135. Further sections address balancer-shaft and driven-gear alignment, the dry-sump lubrication system, and trochoid oil-pump clearances.

Uneven camshaft-cap tightening can damage the cylinder head, caps, and camshafts; the manual identifies the precautions for this assembly.

Water-pump coverage extends to the impeller shaft, seals, bearings, and right crankcase cover installation.

FCR-MX37 Carburetor and Regional Settings

Keihin FCR-MX37 service covers the float, needle valve, starter plungers, and accelerator-pump diaphragm and timing. The tables distinguish USA/Canada carburetor identification 5XC9 90 from 5XCA A0 for the other covered regions, with different jet and needle specifications.

The tuning chapter connects throttle-opening ranges and running symptoms with the relevant carburetor circuits, helping narrow down hesitation or poor response. It also lists tuning-part numbers and explains how atmospheric conditions affect mixture settings.

Map-Controlled CDI and TPS Diagnosis

Ignition and throttle position sensor (TPS) troubleshooting charts cover the engine stop switch, neutral switch, ignition coil, pickup and charging coils, and sensor input/output checks. CDI identification differs between the USA (5XC-90) and other regions (5XC-A0).

The illustrative 3-D Image Map of Ignition Timing explains how engine speed and throttle position influence ignition timing. Connector views and lead-color codes support the electrical tests, with CDI replacement considered after the other ignition components have been checked.

Fork, Shock, and Brake Service

The fork section covers damper bleeding and base-valve service and identifies fork seal driver YM-A0948 / 90890-01502. Allowing the damper assembly to drop into the inner tube can damage the valve inside.

Link-type Monocross rear-suspension coverage includes preload, rebound and compression adjustment, linkage bearings, and spring selection. The tables distinguish regional settings and spring-identification marks, while suspension-setting charts relate handling symptoms to the relevant checks and adjustments.

Rear-shock work covers removal, springs, and bearings; the pressurized cylinder and reservoir are not to be dismantled. Follow the manual’s ventilation warnings during running tests, and leave nitrogen discharge and shock disposal to a Yamaha dealer.

Valve Clearances and Engine-Oil Service Fills

The valve-adjustment section specifies cold clearances of 0.10–0.15 mm at the intake and 0.17–0.22 mm at the exhaust, with separate pad-selection tables for each.

Engine-oil service quantities are 1.15 L for a periodic change and 1.25 L when the oil filter is replaced. The maintenance chapter also covers the oil strainer and oil-pressure inspection.

Printable PDF and Included Pages

Supplied as one English-language, printable PDF with 307 pages total: 291 chapter pages, 15 opening pages including the front cover, safety notice, and warranty, and one back cover. All are included in the total; there are no separate supplements.