Yamaha YZ250 2000 Owner's Service Manual (P/N 5HC-28199-30)

The 2000 Yamaha YZ250 Owner’s Service Manual (P/N 5HC-28199-30) covers factory maintenance, repair, and race setup for the YZ250LC, YZ250M1, and YZ250(M). This is the 1st Edition, June 1999. Whether you are rebuilding the top end or dialing in the suspension for race day, the manual provides assembly-specific procedures and reference data.

PDF Bookmarks, Languages and Page Count

Search, navigation and wiring detail: PDF text search is not available. Eight embedded bookmarks provide access to the index and main chapters. Small wiring-diagram labels are readable when enlarged.

The ZIP contains one printable PDF with English, French, German, and Italian text. Its 568 pages include the original cover and introductory material, along with two memo pages.

Top-End, Drivetrain and Chassis Service

The following selected contents highlight major repair areas. Other covered work includes silencer fiber replacement and ignition-timing checks.

• Cylinder head, cylinder, piston, and YPVS: Top-end disassembly, wear inspection, piston-to-cylinder matching, power-valve assembly, and governor service.

• Clutch and transmission: Friction-plate and clutch-plate inspection, clutch release mechanism repair, primary drive and driven gear service, and internal transmission repair.

• Keihin PWK38S carburetor and reed valve: Disassembly, jet and needle inspection, float-height adjustment, reed-valve checks, and reassembly.

• Cooling system: Radiator-cap and system pressure tests, radiator removal, and water-pump impeller-shaft, bearing, and oil-seal service.

• Brakes and chassis: Front and rear caliper and master-cylinder disassembly, seal replacement, air bleeding, wheel-bearing replacement, steering bearings, and swingarm linkage service.

• Front fork and rear shock: Fork overhaul, rear-shock spring and bearing replacement, and suspension adjustment procedures.

• Electrical diagnosis: A wiring diagram and separate ignition, solenoid-valve, and TPS (throttle position sensor) inspection flowcharts, plus TPS replacement and adjustment procedures.

The repair sections are written for mechanics, while the owner material explains operation, basic maintenance, and inspection.

Always review the safety guidelines before tearing down major components, especially the warnings for pressurized coolant and the nitrogen-charged rear shock.

Regional Setup and Identification

Regional distinctions matter when selecting setup data. The specifications identify different European carburetor settings and suspension specifications. The tuning section distinguishes equal-pitch and unequal-pitch springs, with European standard selections identified in the spring tables.

Identification illustrations show the frame or vehicle identification number, engine serial number, and model-label locations.

Engine Repair and Inspection Data

Step-by-step procedures cover crankcase separation and crankshaft installation. Internal transmission work includes gear inspection, shift-cam and shift-fork checks, and assembled shifting checks.

For top-end repair, the piston-and-cylinder matching chart ties cylinder identification marks to piston size groups and color markings. The cylinder section explicitly prohibits reboring.

Assembly notes flag a specific YPVS risk: push-rod fastener work without the specified set pin can damage power-valve components.

Diagnostics, Diagrams and Special Tools

The specifications chapter provides component-specific torque tables, fluid capacities, clearances, wear limits, and electrical test values. Transmission oil data distinguish a periodic oil change from the total fill.

Ignition and sensor checks: The ignition flowchart traces a no-spark condition through the spark plug, connections, ENGINE STOP button, ignition coil, and CDI magneto before CDI-unit replacement. Test references cover both magneto source coils and the pickup coil; TPS checks include variable resistance and input voltage.

Cable-routing diagrams show hose and lead placement around the frame, radiators, and controls. Exploded views for the water pump and front fork accompany parts-and-job charts.

Special-tool references include the crankcase separating tool YU-01135-A / 90890-01135 and piston pin puller YU-01304 / 90890-01304. The tool section distinguishes US/Canadian tool numbers from those used in other markets.

Race Tuning and Suspension Service Limits

Carburetor tuning includes a throttle-opening chart showing where the different metering components act, weather and track-condition examples, and symptom-based setting tables. Optional jets, needles, sprockets, and suspension springs are listed with part numbers.

Suspension guidance covers rider sag, spring selection, fork oil-level effects, rebound damping, and separate low- and high-compression adjustments at the rear shock. Front-fork and rear-shock setting charts relate handling symptoms to inspection and adjustment areas.

Yamaha recommends dealer maintenance for the front fork. Its assembly notes warn that a dropped damper rod can damage the internal valve.

Rear-shock coverage includes removal, spring and bearing replacement, and external adjustment; it does not provide an internal damper or nitrogen-reservoir rebuild procedure.

Examples of Ring-Wear and Ignition Test Specifications

For piston-ring inspection, the installed end-gap specification is 0.40–0.55 mm, with a wear limit of 0.95 mm. The manual distinguishes the standard range from the replacement limit.

The CDI magneto’s source coil 1 has a specified resistance of 720–1,080 ohms at 20°C (68°F). The ignition section pairs this value with lead identification and meter-connection illustrations for component testing.