2001 Yamaha YZ125(P)/LC 2-Stroke Service Manual (P/N 5NY-28199-30)

• Covers 2001 Yamaha YZ125(P) and YZ125LC 2-stroke motocross machines across USA, CDN, AUS, NZ, ZA, and EUROPE markets
• Official Yamaha factory publication (P/N 5NY-28199-30)
• Contains 47 torque-check specification tables, 3 electrical schematic guides, and 5 detailed exploded-view procedures
• Analyzes critical assemblies including the water pump, YPVS governor, CDI magneto, crankcase, crankshaft, shift cam, shift fork, and swingarm
• Details the front fork, steering, clutch, kick axle, shift shaft, radiator, exhaust pipe, and rear shock absorber

When tuning the 2001 YZ125 competition model, having accurate foundational data is critical. This 561-page PDF document serves as the primary reference for the global 5NY-series build. It outlines fundamental machine identification, pre-operation checks, and detailed system specifications. You get a clear breakdown of engine overhaul parameters, carburetor settings, and chassis adjustments. Transmission, cylinder head, piston, and ignition components are mapped out with exact factory tolerances and service limits.

To maximize workshop efficiency, this publication provides a distinct advantage by pairing exploded diagrams directly with job instruction charts. This format clearly dictates the exact extent of removal, preventing unnecessary teardowns and saving valuable bay time during any repair. Mechanics can confidently bypass expensive dealer trips by utilizing the step-by-step instructions for complex procedures, such as complete crankcase separation, brake system air bleeding, and front fork internal pressure relieving. For accurate reassembly and setup, the text features complete wiring diagrams, cable routing diagrams, maintenance interval charts, carburetor tuning charts, and sectional views. These professional resources ensure your next repair is executed flawlessly.

Working on high-performance 2-strokes requires strict adherence to factory limits to ensure safe and reliable operation; always verify hardware conditions before applying these specifications. Since exhaust fumes contain toxic carbon monoxide and the rear shock absorber utilizes high-pressure nitrogen gas, ensure a well-ventilated workspace and handle components carefully. The technical sections dive deep into the numbers. For instance, you will find comprehensive torque values for engine covers, cylinder head studs, and suspension linkages. It documents the cooling system capacity at 0.95 liters across all variants. Need precise measurements? The intake reed valve thickness is specified at 0.42 mm, and the ignition coil secondary winding resistance is listed at 6.7–10.1k ohms at 20°C.