Compatible with the stator magnet coil of the Yamaha WR450F 2003-2006 off-road motorcycle, original part number 5TJ-81410.

This product is a magneto coil assembly built to original specifications, specifically designed for early Yamaha WR450F 4-stroke professional off-road motorcycles (2003–2006 models). It is an exact match for original part number 5TJ-81410 and meets the ignition and charging system requirements of carbureted versions (including some later fuel-injected models) from that era. This product resolves starting problems and electrical interference caused by a faulty ignition coil, restoring the performance and reliability of this legendary off-road motorcycle. 【Important Product Information】 Original Part Number: 5TJ-81410 Compatible Model: Yamaha WR450F Professional Off-Road Motorcycle Compatible Years: 2003, 2004, 2005, 2006 Important Note: WR450F models from 2007 onwards (especially models with electronic fuel injection) use a completely different design and are not compatible. Please check your vehicle's year of manufacture. Engine Type: 449cc four-stroke single-cylinder engine (mainly with carburetor). Part Function: This product is a critical component of the magneto ignition system and typically includes: Generator/Charging Coil: Powers the CDI ignition system and headlights (if equipped). Ignition Pulse Coil: Transmits crankshaft position signals to the CDI unit, thus precisely controlling the ignition timing, which is critical for engine performance. Lighting coil (on some models): Powers the headlights (on versions with headlights). Symptoms of failure: This product helps resolve common problems caused by a damaged stator: Engine won't start (no response to kickstarter or electric starter, no spark at the spark plugs). Extremely difficult starting, rough idling, misfiring at high RPMs, or loss of power. Unexplained engine stalling off-road. Defective or unusually dim headlights (on versions with headlights).