Yamaha YZ250(G)/LC 1995 Owner's Service Manual (P/N 4MX-28199-80)

Yamaha’s Owner’s Service Manual (P/N 4MX-28199-80) covers the 1995 YZ250(G)/LC and the regional variants listed above. It combines operating guidance and race maintenance with engine, transmission, and chassis repair procedures.

Chapter Bookmarks and Printable PDF

Navigation and wiring detail: PDF text search is not available. Seven embedded bookmarks open the main chapters. Small wire-color codes in the wiring diagram are easier to read when zoomed in.

One printable, 575-page PDF contains English, French, and German text. The total includes the original cover and 11 memo pages.

Engine Rebuilds, Chassis Service, and Race Setup

These selected topics show the manual’s workshop coverage. Other sections include starting and break-in guidance and silencer fiber replacement.

• Engine and transmission: Step-by-step procedures for engine removal, top-end work, crankcase separation, clutch overhaul, and transmission, shift-cam, and shift-fork inspection.

• Carburetor and intake: PWK38 Keihin disassembly, needle-valve and float inspection, reed-valve checks, and reassembly.

• Cooling system: Radiator and cap pressure tests, water-pump disassembly, impeller-shaft inspection, and oil-seal replacement.

• Brakes and wheels: Front and rear caliper and master-cylinder overhaul, brake-system air bleeding, wheel-bearing replacement, and brake-disc inspection.

• Suspension and steering: Front fork oil-seal replacement, damper inspection, steering-bearing service, swingarm checks, and rear shock removal and spring replacement.

• Ignition diagnosis: Wiring diagram, fault-isolation flowchart, spark-gap testing, engine-stop switch checks, and ignition-coil, pickup-coil, and source-coil tests.

• Race setup and maintenance: Carburetor setting charts, sprocket selection, suspension damping and preload adjustments, maintenance schedules, and cleaning and storage guidance.

The repair sections are suited to mechanically experienced owners and technicians with the specified measuring equipment and special tools; Yamaha recommends dealer servicing for the front fork.

Internal Engine Inspection and Reassembly

Factory wear limits and rebuild procedures provide a basis for judging measured wear before choosing replacement parts. The piston-and-cylinder matching chart pairs cylinder identification marks with color-coded pistons; the cylinder inspection section specifically cautions against reboring.

YPVS governor coverage includes disassembly, thrust-bearing and washer inspection, and reassembly alignment. Transmission instructions distinguish gear orientation, shift-fork locations, and operational checks after assembly.

Exploded assembly drawings and job instruction charts identify parts, related jobs, and removal notes. The special-tool section lists the crankcase separator, crankshaft installation tools, clutch holder, and rotor puller with their tool numbers.

Carburetor Settings and Water-Pump Service

The carburetor tables separate European 4MX10 settings from 4MX00 settings for the other listed markets. The tuning chapter identifies the main nozzle as press-fit and nonreplaceable, which matters when selecting tuning parts.

Water-pump guidance connects abnormal coolant-level changes, discolored coolant, and milky transmission oil with the need for inspection. Reassembly notes flag the risk of damaging the oil-seal lip or dislodging its spring during impeller-shaft installation.

Follow the manual’s precautions for hot coolant, brake service, and the pressurized rear shock, and use the specified special tools.

Fork Repair and Rear Shock Scope

The front fork chapter includes oil-level measurement conditions, oil distribution and bleeding, and separate inspection criteria for the damper rod, base valve, springs, and tubes. It warns that incorrect damper-rod insertion can damage the internal valve.

Rear shock coverage includes removal, external inspection, spring replacement, and preload adjustment. Internal cylinder and reservoir disassembly is expressly prohibited; this section should not be treated as an internal damper-overhaul guide.

Ignition Fault Isolation and Track Tuning

The ignition inspection flowchart connects a no-spark complaint with component checks before CDI-unit replacement is considered. Connector sketches, lead colors, tester connections, and resistance specifications support those checks; cable routing diagrams show control-cable, brake-hose, and ignition-lead placement.

Tuning charts relate carburetor settings to weather, track conditions, symptoms, and throttle opening. Separate suspension charts connect handling complaints with spring, oil-level, and damping adjustments, rather than presenting one setup for every rider.

Ring-Gap and Engine Service Data: A Preview

Piston-ring inspection: The installed ring end-gap specification is 0.55–0.75 mm, with a 1.3 mm service limit. The cylinder and piston section distinguishes this check from ring side-clearance and piston-clearance measurements.

Oil changes and reassembly: Transmission oil capacity for a periodic change is 0.75 L. The cylinder-head nut specification is 28 Nm; separate stud specifications and staged, crisscross tightening notes are provided for reassembly.