Yamaha - Thermosensor assy - 6CJ-85790-00-00Yamaha Thermosensor Assembly Engine Temperature Monitoring 6CJ 85790 00 00 Overview When you spend enough time around Yamaha outboards, you learn pretty quickly that temperature control is everything. The Thermosensor Assembly 6CJ 85790 00 00 keeps track of engine heat and sends that information to the engines monitoring system so the motor knows when things are running right. Its a small component, but it plays a big role in protecting the engine