RIVA Yamaha 1.8L Thermostat Delete Kit

Allows Yamaha SVHO, SHO & HO engines to run cooler by replacing the thermostat with a specialized restrictor. Ideal for modified watercraft operating in high air & water temperatures. Designed to be used with RIVA Engine Cooling Upgrade Kits. Precision machined restrictor includes o-ring system for superior sealing in thermostat housing. Includes complete installation instructions.