663-44324-A0 Yamaha Gasket | Genuine OEM Yamaha Outboard Part

🔧 Product Description

Genuine Yamaha Water Pump Cartridge Gasket - Part Number: 663-44324-A0

A genuine Yamaha gasket used beneath the water-pump cartridge or wear-plate assembly on selected 30HP, 40HP and 50HP two-stroke outboards.

The gasket seals the cartridge assembly against the gearcase and helps maintain water-pump suction and discharge pressure.

⚙️ Key Features

• Genuine Yamaha OEM water-pump cartridge gasket

• Correct Yamaha part number 663-44324-A0

• Replaces the earlier 663-44324-00 reference

• Used in selected 30HP to 50HP two-stroke lower units

• Cross-references with Sierra, Recmar and Mercury / Mariner numbers

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 663-44324-A0 → Supersedes 663-44324-00

• 663-44324-00 earlier Yamaha water-pump gasket reference

OEM / Related Numbers:

• 663-44324-A0

• 663-44324-A0-00

• 66344324A000

• 663-44324-00

• 663-44315-A0 related lower plate gasket

• 663-44316-A0 related upper plate gasket

• Mercury / Mariner: 27-81421M

Aftermarket / Verified Equivalents:

• Sierra: 18-0294

• Recmar: REC663-44324-00

• Mercury / Mariner: 27-81421M

• Included in Sierra lower-unit seal kit 18-2789

🚤 Compatibility

Commonly used on:

• Yamaha 30HP, 40HP and 50HP two-stroke water-pump assemblies

• Yamaha gearcases using the 663-series cartridge and wear-plate design

Typically suits:

• Engine models:

• Yamaha 30A and related 30HP two-stroke gearcases

• Yamaha 40HP two-stroke - approximately 1984-1994

• Yamaha 40E, 40H, 40J, 40N and 40Q

• Yamaha 50HP two-stroke - approximately 1984-1987

• Yamaha 50HP Pro Series - approximately 1987-1990

• Yamaha P50 - approximately 1995-1996

• Yamaha 50D, 50G and 50H gearcases using the 663-series water pump

• HP Range: 30HP - 50HP

• Engine Type: Yamaha carburetted two-stroke outboard

• Year Range: Approximately 1984 - 1996, dependent on gearcase design

🔌 Function

The gasket seals the water-pump cartridge to the lower-unit housing. This prevents water from bypassing the pump chamber and allows the impeller to maintain adequate cooling-water flow.

Common signs of failure:

• Reduced tell-tale or cooling-water output

• Engine overheats after pump installation

• Gasket is torn, compressed or incorrectly aligned

• Water-pressure loss occurs around the cartridge base

• Pump housing will not seat flat against the gearcase

📦 Condition

• Genuine Yamaha part

• Brand new

• Supplied in original or equivalent packaging