2001 Yamaha YZ250F(P)/LC Owner's Service Manual (P/N 5SG-28199-30)

This Yamaha Owner's Service Manual for the 2001 YZ250F(P)/LC, publication 5SG-28199-30 (first edition, August 2001), covers operation, inspection, maintenance, repair, and race setup for the regional variants listed above.

• Engine overhaul: Camshaft and cylinder-head service, valve-clearance adjustment, piston inspection, crankcase separation, and crankshaft installation.

• Clutch and shifting: Wet-clutch disassembly, plate and spring checks, plus transmission, shift cam, shift fork, and kick shaft service.

• Cooling and lubrication: Radiator pressure testing, water-pump seal and impeller inspection, oil-filter replacement, and oil-pump clearance checks.

• Chassis and brakes: Front fork rebuilds, steering-head and swingarm bearing work, brake-caliper and master-cylinder service, and hydraulic brake bleeding.

• Ignition and TPS: Map-controlled CDI explanations, ignition-coil and magneto tests, wiring diagrams, and throttle position sensor replacement and adjustment.

• Race tuning: FCR-MX37 jetting, accelerator-pump adjustment, sprocket selection, and front/rear suspension setup with symptom-based charts.

• Maintenance reference: Race-based service intervals, pre-operation checks, torque-check points, component tightening tables, fluid capacities, and wear limits.

The repair sections suit professional mechanics and experienced DIY owners familiar with precision measurements and the specified special tools.

Engine, Clutch, and Transmission Repair

Exploded assembly drawings, section views, and job charts identify the components involved in each operation. Top-end coverage includes valve sealing and guide inspection, valve-clearance pad selection tables, and paint-mark matching between cylinder heads and valve lifters.

Bottom-end sections extend to balancer timing, crankshaft runout and connecting-rod checks, transmission dog and fork inspection, and final shifter-operation checks. Tool references include the crankcase separator YU-1135-A/90890-01135 and clutch holding tool YM-91042/90890-04086.

The camshaft chapter warns that uneven cap tightening can damage the cylinder head, camshaft caps, and camshafts.

Carburetor Service and Race Jetting

FCR-MX37 service includes float-height measurement, cold and hot starter plunger inspection, and accelerator-pump timing. The tuning chapter distinguishes steady-throttle metering from fuel delivery during quick throttle openings and provides jet, needle, and leak-jet selection charts.

Pilot-screw positions are individually factory-set; the printed turn counts are examples. The TPS handling note cautions against loosening the sensor screws during routine carburetor service because disturbed adjustment can reduce engine performance.

Ignition and Throttle Position Sensor Diagnosis

The Ignition System and Throttle Position Sensor System inspection charts connect component tests with fault isolation. The no-spark chart helps distinguish wiring, stop-switch, ignition-coil, magneto, and neutral-switch faults before the CDI unit is replaced.

The Electrical Components and Wiring Diagram provides wire-color codes and connector layouts. Cable Routing Diagram pages show harness, control-cable, breather, and brake-hose placement.

Forks, Monocross Suspension, and Brakes

Fork procedures include damper-rod and base-valve inspection, seal installation, oil bleeding, and oil-level setting. Steering-head, wheel, and swingarm sections cover bearing inspection and replacement; brake sections include caliper and master-cylinder overhaul with post-assembly leak checks.

Link-type Monocross rear-suspension coverage includes spring and bearing work and external damping adjustment. Leaking or damaged damper assemblies are specified for replacement. The rear shock contains highly pressurized nitrogen: its handling warning prohibits cylinder or tank disassembly and exposure to high heat.

Regional tables distinguish European spring and damping settings. The Suspension setting charts relate harshness, bottoming, and poor traction to checks of spring choice, preload, fork oil level, and damping.

Selected Engine Service Data and Shock Dimensions

These figures are a small sample of the manual's fluid capacities, inspection limits, and component dimensions.

Engine-oil quantities distinguish a periodic change at 1.5 L from a change with oil-filter replacement at 1.6 L. Cylinder-head tables list a 0.05 mm warpage limit, while valve checks specify 0.10–0.15 mm intake clearance with the engine cold.

The rear-suspension tables list 132 mm of shock-absorber travel. This is the damper stroke, separate from rear-wheel travel.

Searchable Text, Contents Bookmarks, and PDF Details

Search and diagram detail: PDF text is searchable. Chapter bookmarks open the contents pages rather than individual repair sections. Small wire-color codes and connector labels are clear when enlarged.

Supplied as one printable, 666-page PDF containing English, French, German, and Italian. The total already includes one front cover, one back cover, and two blank pages.