ESR921 is a superior regulator/rectifier designed to outperform the Kymco OEM unit. We built ESR921 around a modern heat sink and we incorporated the newest generation of our control circuitry that offers super stable voltage output across the RPM range. This efficient heat sink dissipates the heat quickly and efficiently making for a very reliable unit. This will be the last regulator you will need on your Kymco. Like all regulator/rectifiers in our range of products, this ESR921 also comes with a full one year warranty.