61A-45155-01-00 - CAP supercedes 61A-45155-00-00

Tucked up near the powerhead, this upper-casing cap does the unglamorous work of sealing off the driveshaft housing on Yamaha’s big-block V6 outboards. Molded from high-impact black composite and threaded to factory spec, it spins in by hand, then snugs down to lock out spray, grit, and exhaust residue that can chew up bearings over time. The updated “-01” version replaces the earlier 61A-45155-00-00, so it drops straight into F225, F250, and F300 models (plus their FL, LF, VX, and VZ cousins) from 1998 onward—no adapters, no drama.

Why keep a spare in the console?

• OEM geometry guarantees a flush fit in seconds; no chasing cross-threads.
• Fiber-reinforced polymer shrugs off heat and torque better than brittle aftermarket caps.
• Built-in sealing lip mates perfectly with the factory O-ring groove to block moisture and salt crystals.
• Knurled grip ring means you can tighten or loosen it with wet fingers—tool-free.

Swap it whenever the old cap shows hairline cracks or the gasket weeps, and you’ll preserve shaft alignment, keep corrosion at bay, and protect thousands of dollars’ worth of lower-unit hardware for the cost of a marina sandwich.