Restore reliable cooling on your midrange Yamaha with the Water Pump Repair Kit 63D-W0078-03-00—a one-box refresh for F40, F50, and F60 four-strokes that share the 63D lower unit. Pop the gearcase, clear out the old bits, and everything you need is right here.

What’s in the kit (and why it matters)

• Nitrile-rubber impeller with brass hub—flexes at cold-start RPM yet won’t shred when you hammer the throttle.

• Mirror-polished stainless wear plate & cup—restore factory clearance so the pump holds prime at idle.

• Fiber gasket, O-rings, key, and guide pins—all pre-sized for the 2.50-in. housing; no trimming or RTV.

• New stainless screws—because re-using rusty hardware is how bolts snap next season.

Swap the parts in under an hour, torque to spec, and your F-series will push a solid tell-tale stream whether you’re trolling for snapper or cruising to the sandbar. Predictable temp gauge, longer impeller life, and one less worry when you’re miles from the ramp—that’s what genuine Yamaha parts deliver.