Water Pump Impeller Kit – Fits Yamaha 25-30 HP (Replaces 61N-W0078-11-00, 61N-W0078-10-00)

Water Pump Impeller Kit – Fits Yamaha 25-30 HP (Replaces 61N-W0078-11-00)

This water pump impeller repair kit is engineered for a wide range of Yamaha 2-stroke and 4-stroke outboard motors from 25 to 30 HP. It provides a reliable solution for models including the 2-stroke 25B, 25X, 30H, and 30G series (2000–2018), and the 4-stroke F25, F25A, and F25B series (1998–2019). Please note that this kit does not fit F25C models.

This kit serves as a direct replacement for multiple Yamaha and aftermarket part numbers, ensuring broad compatibility for routine lower unit maintenance. It includes all necessary components for a complete water pump service.

• Installation Method: Standard Lower Unit Service
• Core Components: Includes neoprene impeller, nylon housing, stainless steel cup/plate, and all required gaskets, seals, and bolts.
• Manufacturing Standard: Produced in an ISO9002 certified facility for guaranteed quality and performance.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Yamaha 2-Stroke Models

Yamaha 4-Stroke Models

Technical Specifications

Package Contents

• 1 x Impeller (63V-44352-01-00)
• 1 x Cartridge Insert (63V-44322-00-00)
• 1 x Cartridge Outer Plate (68T-44323-00-00)
• 1 x Water Seal Damper 3 (6L2-44367-00-00/6L2-44367-01-00)
• 1 x Woodruff Key (664-44338-00-00)
• 1 x O-Ring (93210-49046-00)
• 2 x Plates (63V-44328-01-00)
• 2 x Dowel Pins (93604-10M03-00)
• 4 x Bolts (97095-08045-00)

Installation Guide

1. Safety First: Disconnect the battery and disable the ignition system.
2. Access the Lower Unit: Shift the outboard into neutral. Remove the bolts securing the lower unit (gearcase) to the upper casing and carefully lower it.
3. Disassemble the Water Pump: Locate the water pump housing on top of the gearcase. Remove the bolts to lift the housing and expose the impeller.
4. Remove Old Components: Take out the old impeller, wear plate, gaskets, and seals. Note the orientation of the impeller vanes for correct installation.
5. Clean and Inspect: Thoroughly clean all surfaces of the pump housing and gearcase. Inspect for scoring, warping, or corrosion.
6. Install New Components: Install the new wear plate, gaskets, and O-rings. Slide the new impeller onto the driveshaft while turning the shaft clockwise to bend the vanes correctly.
7. Reassemble the Pump: Secure the water pump housing with its new parts and torque the bolts to the manufacturer's specification.
8. Reinstall Lower Unit: Align the driveshaft and water tube, then carefully raise the lower unit back into place and secure it.
9. Test Operation: Reconnect the battery. Start the engine in a water supply (using flushing muffs) and verify a steady stream of water from the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my engine?
A: The surest way is to match your engine's model and year against our compatibility tables. You should also verify your existing part number against our cross-reference list. This kit is confirmed not to fit F25C models.

Q: What are the signs of a failing water pump impeller?
A: The most common signs are engine overheating at idle or low speeds, and a weak or intermittent water stream from the "tell-tale" outlet port. Visible cracks, missing vanes, or hardened rubber on the old impeller are clear indicators it needs replacement.

Q: How often should I replace the water pump impeller?
A: As a general rule, it is recommended to replace your impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can be shorter if you frequently operate in sandy, silty, or saltwater environments.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.