Yamaha Water Pump Repair Kit – 63V-W0078-04-00

When your F9.9, T9.9, or F15 starts running hotter than usual, it’s almost always the impeller crying for help. This factory kit bundles every cooling-system wear part in one tidy box, so you can restore full water flow in a single afternoon. Inside you’ll find a fresh six-blade rubber impeller, stainless cartridge cup, polished wear plate, water-seal damper, Woodruff key, O-ring, and four new mounting bolts—each component machined or molded to Yamaha’s tight tolerances and stamped with the latest “-04” revision code. Slide the parts into place, torque to spec, and watch the tell-tale jet shoot strong and steady again.

What makes the OEM kit worth it?

• Complete component stack: impeller, plate, insert, seals, hardware—no last-minute parts run.

• Stainless and nitrile construction shrugs off sand, silt, and salt for longer service intervals.

• Direct fit for 1996-present 9.9 hp & 15 hp 2-/4-stroke blocks—drop in, no shimming.

• Revised “-04” impeller compound stays pliable during winter lay-up, reducing spring start-up failures.

Swap the kit every 200 hours—or at winter haul-out—and you’ll ditch the overheat buzzer, protect your head gasket, and keep cruising those skinny flats without a second thought.