Keep your Yamaha at peak performance by running at the optimum temperature. Outboards rely on the water pump to maintain optimum operating temperatures. Any restriction to the water flow can result in a loss of power and efficiency and possibly overheating the engine. Sierra makes sourcing the parts to service a Yamaha outboard water pump easy. By packaging all the necessary parts in a single kit, extra time spent sourcing each individual part is eliminated. Sierra engineers each component included in the kit to meet or exceed manufacturer specifications. Boaters and technicians can be assured a Sierra part will fit right the first time and restore function to factory standards or better. Get the most out of your Yamaha and spend more trouble free time on the water by servicing the water pump with a Sierra water pump kit. Key Features Kit components are engineered to meet or exceed OEM specifications Pre-packaged kit eliminates time searching and sourcing individual parts Kit includes: pump housing, impeller cup, impeller and key, wear plate, gasket, O-rings and stainless steel boltsCompatible with Yamaha outboards Sierra Part Number 18-3311 Application TableApplicationOEM Part NumberMallory9-48614Yamaha Outboard6G5-W0078-A1-00, 6G5-W0078-00-00, 6G5-W0078-01-00The Sierra Engine Parts SelectorIn addition to water pump kits, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see ourEngine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.