2006 Yamaha YZ125(W)/W1 Service & Repair Manual (P/N 1C3-28199-32)

• Original OEM publication P/N 1C3-28199-32, first edition May 2006
• Covers the 2006 Yamaha YZ125, including YZ125W and YZ125W1 variants
• 550 pages of technical specifications, exploded-view diagrams, and maintenance tables
• Documents all essential engine, chassis, electrical, and fuel-mixing specifications for the 1C3-series build

Documented Maintenance and Technical Details

Let's drop the corporate fluff. This documentation breaks down the 2006 Yamaha YZ125 motocross machine piece by piece. It covers the essentials for both the chassis and the 2-stroke engine, detailing general information alongside rigorous inspection procedures. Need structural specifics? The publication highlights frame construction and precise engine mounting parameters. Exploded-view diagrams map out every component sequence, giving you a clear visual blueprint for tear-downs and rebuilds.

Specification Highlights and Reference Data

Expect comprehensive maintenance tables listing torque values across Nm, m-kg, and ft-lb. Engine performance data is heavily documented, covering compression ratios, fuel mixture requirements, and cooling system specs like the 0.56 L capacity. For electrical diagnostics, the text outlines component testing procedures. This includes source and pickup coil resistance, as well as the ignition coil primary winding resistance, which is noted at 0.24–0.36 ohms. Cylinder head bolt torque values are specifically documented at 28 Nm for the 5-stud configuration. Keep in mind that maintaining a high-performance 2-stroke involves inherent risks. All reference data discussed here requires verification against official OEM figures during actual workshop procedures to ensure mechanical integrity and rider safety.