It ensures optimal performance and prevents overheating. Enhanced Engine Performance: Proper temperature regulation leads to improved engine performance, fuel efficiency, and reduced emissions. for Thermo Wax Assembly: This assembly is designed for Honda HRX217, HRR216, for GCV160, GCV190, GCV160LA0, and GCV190LA lawn mowers with the part number 16620-Z8D-305 and 16620-Z8D-842.