20-21255 KPMI, Twin Cam compression release valve set

Designed for 1999 to 2017 Twin Cam style engines, this Kibblewhite (KPMI) compression release valve set is a must-have for high-compression or large-displacement builds. These M10x1 threaded valves allow for much easier electric starting by venting cylinder pressure at the push of a button, then automatically closing once the engine starts. They feature a 1.730 inch overall length and a 5-7 Newton closing force, ensuring they stay sealed during high-performance operation. The knobs are molded to remain cool to the touch for easy use on a hot motor. Sold as a pair, these valves are the professional's choice for protecting starters and batteries on modified Twin Cam Harleys.