Compatible with Yamaha and other models, high-voltage ignition coil, original OE reference 66T-85570-00. Replaces the ignition coil to improve engine ignition performance.

【Precise Replacement to Original Specifications】 This high-voltage ignition coil was specifically designed as a replacement for the original part with reference number 66T-85570-00. It exactly matches the electrical parameters, mounting surface, and performance standards of the original vehicle, thus guaranteeing perfect compatibility with the CDI (or control unit) and spark plugs of the respective vehicle. It is a direct and reliable solution for resolving ignition problems and replacing worn or damaged original parts.

【High-Efficiency Energy Conversion Core】 The high-voltage coil converts the low voltage (typically 12V) of the ignition system into a high voltage of several thousand or even tens of thousands of volts. This generates a strong spark at the spark plug and ensures reliable combustion of the fuel-air mixture in the cylinder. It is a crucial component for proper engine operation.

Robust and high-quality construction. Internal coil: Precision wound from high-purity, enameled copper wire. The insulating layer offers excellent performance, ensuring efficient energy conversion and optimal heat resistance. Outer insulation: The outer casing is made of engineering-grade plastic, resistant to high temperatures, UV radiation, and oils. The high-voltage output is insulated with high-performance rubber or silicone, effectively preventing voltage drops and arcing, thus optimally handling the harsh conditions in the engine compartment. Precise interface: The low-voltage input connector is perfectly compatible with the vehicle's original wiring harness, and the high-voltage output interface fits precisely onto the spark plug connector or high-voltage cable. This ensures a reliable connection and lossless power transmission. 【Fixes Common Ignition Problems】 Replacing this component effectively resolves various engine problems caused by a deteriorating high-voltage coil: difficulty starting in cold weather or frequent stalling after starting; rough idling, strong vibrations, jerking during acceleration, loss of power; lack of power at high RPMs, delayed throttle response; Weak, unusually discolored, or absent spark; increased fuel consumption. 【Easy Installation】 Usually located near the cylinder head. To install, first disconnect the negative battery terminal, disconnect the low-voltage connector, remove the mounting screws, install and secure the new high-voltage transformer, and then connect the high-voltage cable to the low-voltage connector. Key Compatibility Information: Original Equipment (OE) Part Number: 66T-85570-00. Key Compatible Makes/Models: This part number is commonly found on certain Yamaha and other motorcycle and ATV models (e.g., some Yamaha YZF-R and FZ series models). Part number matching is required for specific vehicle models.