2003 Yamaha TZR50 X-Power Service & Repair Manual (P/N 5WX-AE1)

• Documents the 2003 Yamaha TZR50 and X-Power variants, outlining the liquid-cooled 49.7 cc 2-stroke engine and chassis specifications
• Official Yamaha publication, Part Number 5WX-AE1, 1st edition, December 2003
• Features 12 detailed wiring diagrams and 58 specialized mechanical exploded-view illustrations for precise sub-assembly identification
• Serves as the definitive factory reference used for the 5WX build series

Component and Assembly Documentation

This service manual delivers a complete technical breakdown of the 5WX-series motorcycle. It outlines disassembly, inspection, and assembly protocols for the engine, including the top-end, crankshaft, and transmission systems, alongside the chassis, electrical grid, and cooling architecture. The text provides clear parameters for handling the Dellorto PHBN 16 NS/1 carburetor, the Autolube pump, and the Deltabox frame. Each section reinforces maintenance standards, specifying lubrication requirements for internal and external components, and outlining the correct handling of the wet-clutch system and six-speed transmission. Always adhere strictly to the included torque and handling specifications to maintain vehicle integrity and personal safety during mechanical work.

Specification and Reference Data

The manual supplies precise technical reference values for critical maintenance tasks. Cylinder head bolt torque values are set at 17 Nm for the M7 nuts, while the spark plug requires 23 Nm. The cooling system capacity for this model is 0.7 liters, with a radiator cap opening pressure of 0.9 kg/cm2. Drive chain slack must be maintained at 20–25 mm for proper tension. Standard gearbox oil changes require 0.75 liters of SAE 10W30 SE grade oil. Additionally, the pickup coil resistance for the MORIC 5WX magneto is rated at 350 ohms +/- 20%.