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SeaSierra
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Water Pump Impeller Kit – Fits Yamaha 150-225HP V6 2-Stroke (Replaces 6G5-W0078-A1-00)

$47.50 $76.00

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Orders are typically processed within 1–2 business days.


U.S. orders usually arrive within 6–15 days, depending on stock location and destination.


International delivery times may vary due to customs processing.


Tracking information will be provided once your order ships.

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This Water Pump Impeller Kit – Fits Yamaha 150-225HP V6 2-Stroke (Replaces 6G5-W0078-A1-00) is designed for Yamaha 2-Stroke V6 outboard motors, including 150HP, 175HP, 200HP, and 225HP models manufactured between 1984 and 1991. It provides all the necessary components for a complete and reliable water pump service to maintain optimal engine cooling.

It serves as a direct interchange for Yamaha 6G5-W0078-A1-00, 6G5-W0078-00-00, 6G5-W0078-01-00, Sierra 18-3311, and Mallory 9-48618.

  • Engineered for direct replacement installation.
  • Features a durable, silver aluminum housing.
  • Kit includes all essential hardware for a full service.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand Part Number
Yamaha 6G5-W0078-A1-00
Yamaha 6G5-W0078-00-00
Yamaha 6G5-W0078-01-00
Sierra 18-3311
Mallory 9-48618

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This kit fits a wide range of Yamaha V6 2-Stroke outboards. It is essential to verify your specific model and year for correct fitment.

Brand Model Rated HP Stroke Years OEM Part No. Notes
Yamaha 150ETLD 150 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 150ETLDA 150 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 150ETLF 150 2-Stroke 1989 6G5-W0078-A1-00
Yamaha 150ETLJ 150 2-Stroke 1986 6G5-W0078-A1-00
Yamaha 150ETLK 150 2-Stroke 1985 6G5-W0078-A1-00
Yamaha 150ETLN 150 2-Stroke 1984 6G5-W0078-A1-00
Yamaha 150ETXD 150 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 150ETXDA 150 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 150ETXF 150 2-Stroke 1989 6G5-W0078-A1-00
Yamaha 150ETXJ 150 2-Stroke 1986 6G5-W0078-A1-00
Yamaha 150ETXK 150 2-Stroke 1985 6G5-W0078-A1-00
Yamaha 150ETXN 150 2-Stroke 1984 6G5-W0078-A1-00
Yamaha 150TLRP 150 2-Stroke 1991 6G5-W0078-A1-00
Yamaha 150TXRP 150 2-Stroke 1991 6G5-W0078-A1-00
Yamaha L150ETXD 150 2-Stroke 1990 6G5-W0078-A1-00
Yamaha L150ETXDA 150 2-Stroke 1990 6G5-W0078-A1-00
Yamaha L150ETXF 150 2-Stroke 1989 6G5-W0078-A1-00
Yamaha L150ETXG 150 2-Stroke 1988 6G5-W0078-A1-00
Yamaha L150ETXJ 150 2-Stroke 1986 6G5-W0078-A1-00
Yamaha L150TXRP 150 2-Stroke 1991 6G5-W0078-A1-00
Yamaha P150TLRP 150 2-Stroke 1991 6G5-W0078-A1-00
Yamaha PROV150LD 150 2-Stroke 1990 6G5-W0078-A1-00
Yamaha PROV150LDA 150 2-Stroke 1990 6G5-W0078-A1-00
Yamaha PROV150LF 150 2-Stroke 1989 6G5-W0078-A1-00
Yamaha PROV150LG 150 2-Stroke 1988 6G5-W0078-A1-00
Yamaha PROV150LH 150 2-Stroke 1987 6G5-W0078-A1-00
Yamaha 175ETLD 175 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 175ETLDA 175 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 175ETLF 175 2-Stroke 1989 6G5-W0078-A1-00
Yamaha 175ETLJ 175 2-Stroke 1986 6G5-W0078-A1-00
Yamaha 175ETLK 175 2-Stroke 1985 6G5-W0078-A1-00
Yamaha 175ETLN 175 2-Stroke 1984 6G5-W0078-A1-00
Yamaha 175ETXD 175 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 175ETXDA 175 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 175ETXF 175 2-Stroke 1989 6G5-W0078-A1-00
Yamaha 175ETXJ 175 2-Stroke 1986 6G5-W0078-A1-00
Yamaha 175ETXK 175 2-Stroke 1985 6G5-W0078-A1-00
Yamaha 175ETXN 175 2-Stroke 1984 6G5-W0078-A1-00
Yamaha 175TLRP 175 2-Stroke 1991 6G5-W0078-A1-00
Yamaha 175TXRP 175 2-Stroke 1991 6G5-W0078-A1-00
Yamaha 200ETLD 200 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 200ETLDA 200 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 200ETLD-JD 200 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 200ETLF 200 2-Stroke 1989 6G5-W0078-A1-00
Yamaha 200ETLF-JD 200 2-Stroke 1989 6G5-W0078-A1-00
Yamaha 200ETLJ 200 2-Stroke 1986 6G5-W0078-A1-00
Yamaha 200ETLK 200 2-Stroke 1985 6G5-W0078-A1-00
Yamaha 200ETLN 200 2-Stroke 1984 6G5-W0078-A1-00
Yamaha 200ETXD 200 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 200ETXDA 200 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 200ETXF 200 2-Stroke 1989 6G5-W0078-A1-00
Yamaha 200ETXJ 200 2-Stroke 1986 6G5-W0078-A1-00
Yamaha 200ETXK 200 2-Stroke 1985 6G5-W0078-A1-00
Yamaha 200ETXN 200 2-Stroke 1984 6G5-W0078-A1-00
Yamaha 200TJRP 200 2-Stroke 1991 6G5-W0078-A1-00
Yamaha 200TLRP 200 2-Stroke 1991 6G5-W0078-A1-00
Yamaha 200TXRP 200 2-Stroke 1991 6G5-W0078-A1-00
Yamaha L200ETXD 200 2-Stroke 1990 6G5-W0078-A1-00
Yamaha L200ETXDA 200 2-Stroke 1990 6G5-W0078-A1-00
Yamaha L200ETXF 200 2-Stroke 1989 6G5-W0078-A1-00
Yamaha L200ETXG 200 2-Stroke 1988 6G5-W0078-A1-00
Yamaha L200ETXJ 200 2-Stroke 1986 6G5-W0078-A1-00
Yamaha L200TXRP 200 2-Stroke 1991 6G5-W0078-A1-00
Yamaha P200TLRQ 200 2-Stroke 1992 6G5-W0078-A1-00
Yamaha 225ETLD 225 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 225ETLDA 225 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 225ETXD 225 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 225ETXDA 225 2-Stroke 1990 6G5-W0078-A1-00
Yamaha 225TLRP 225 2-Stroke 1991 6G5-W0078-A1-00
Yamaha 225TXRP 225 2-Stroke 1991 6G5-W0078-A1-00
Yamaha V6EXCELLF 225 2-Stroke 1989 6G5-W0078-A1-00
Yamaha V6EXCELLG 225 2-Stroke 1988 6G5-W0078-A1-00
Yamaha V6EXCELLH 225 2-Stroke 1987 6G5-W0078-A1-00
Yamaha V6EXCELXF 225 2-Stroke 1989 6G5-W0078-A1-00
Yamaha V6EXCELXG 225 2-Stroke 1988 6G5-W0078-A1-00
Yamaha V6EXCELXH 225 2-Stroke 1987 6G5-W0078-A1-00
Yamaha V6SPECIALLJ 220 2-Stroke 1986 6G5-W0078-A1-00
Yamaha V6SPECIALLK 220 2-Stroke 1985 6G5-W0078-A1-00
Yamaha V6SPECIALLN 220 2-Stroke 1984 6G5-W0078-A1-00
Yamaha V6SPECIALXJ 220 2-Stroke 1986 6G5-W0078-A1-00
Yamaha V6SPECIALXK 220 2-Stroke 1985 6G5-W0078-A1-00
Yamaha V6SPECIALXN 220 2-Stroke 1984 6G5-W0078-A1-00

Technical Specs

Product Type
Outboard Water Pump Repair Kit with Housing
Installation
Direct Replacement
Housing Material
Aluminum
Housing Color
Silver
Engine Compatibility
For 2-Stroke V6 Outboard Engines
Product Dimensions
17.0" L x 13.0" W x 9.5" H
Package Dimensions
17.0" L x 13.0" W x 9.5" H

What’s in the Box

  • 1 x Housing (6E5-44311-00-00)
  • 1 x Impeller (6E5-44352-01-00)
  • 1 x Gasket, Water Pump (6E5-44315-A0-00)
  • 1 x Insert, Cartridge (61A-44322-00-00/6E5-44322-00-00)
  • 1 x Outer Plate, Cartridge (6G5-44323-00-00/6G5-44323-01-00)
  • 1 x Key, Woodruff (90280-04M05-00)
  • 1 x O-Ring (93210-37M67-00)
  • 1 x O-Ring (93210-86M38-00)
  • 2 x Pin, Dowel (93606-12019-00)
  • 4 x Bolt (97080-08045-00/97095-08045-00)
  • 4 x Washer (90209-08M02-00)

Installation Notes

  1. Disconnect the negative battery cable before beginning work.
  2. Remove the lower unit (gearcase) from the outboard's midsection.
  3. Unscrew the bolts securing the water pump housing and remove the old assembly.
  4. Thoroughly clean the driveshaft and all mating surfaces, removing any old gasket material or sealant.
  5. Install the new Woodruff key and slide the new impeller onto the driveshaft.
  6. Assemble the new cartridge, gaskets, and plate with the new housing.
  7. Carefully position the new water pump assembly over the impeller, ensuring the impeller vanes are oriented correctly, and bolt it down to the specified torque.
  8. Reinstall the lower unit onto the midsection.
  9. Reconnect the battery, start the engine in a water source, and confirm a strong, steady water stream from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my specific Yamaha engine?

Check your engine's model and year against the comprehensive 'Engine & Model Compatibility' list above. This kit is designed for Yamaha 2-Stroke V6 models (150-225HP) primarily from 1984 to 1991. Verifying your OEM part number (e.g., 6G5-W0078-A1-00) is the best way to ensure an exact match.

What are the signs of a failing water pump impeller?

Common symptoms include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, and reduced engine performance. It's crucial to address these signs immediately to prevent severe engine damage.

How often should I replace the water pump kit?

For optimal reliability and to prevent overheating, we recommend inspecting the impeller annually and replacing the entire water pump kit every 2-3 years or every 200-300 hours of use, whichever comes first. This interval can vary based on operating conditions (e.g., saltwater vs. freshwater).

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost?

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns?

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

  • Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
  • This is an aftermarket replacement, not an OEM component.
  • Professional installation is recommended for safety and performance.

About Sea Sierra

  • Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
  • Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
  • Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

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