Water Pump Impeller Kit for Yamaha Outboard 150-300 HP - Repair Kit

In this review of the Water Pump Impeller Kit for Yamaha Outboard 150-300 HP, the bottom line is simple: it is a comprehensive repair kit aimed at boat owners who want to replace a failing impeller and related components themselves. The kit includes the impeller, pump cup, housing, wear plate and a full complement of gasket, bolts, key and O-ring, making it attractive for DIY engine maintenance. It is best for owners of compatible Yamaha motors who need a near-complete replacement assembly at a reasonable price, though buyers should double-check part fit before installation.

Key Features

• Complete kit: The package contains the water pump impeller, pump cup, housing, wear plate and hardware so most pump rebuilds can be completed without extra parts.
• Wide Yamaha fitment: Designed to replace several Yamaha part numbers for 150 through 300 HP outboards, which simplifies ordering for common mid- to high-horsepower motors.
• Included sealing parts: The kit supplies a gasket, O-ring, impeller key and dowel so you get the key sealing and alignment parts necessary for reassembly.
• Hardware provided: Bolts with washers and a pin are included to secure the housing and wear plate, reducing the need to source fasteners separately.
• Manufacturer background: From a marine parts R&D and manufacturing brand, the kit reflects focused production for boating and outboard repairs.

Who It's For

This kit is aimed at boat owners and marine mechanics working on Yamaha outboards from 150 HP up to 300 HP who prefer a single purchase that contains the majority of parts needed for a water pump rebuild. It suits routine maintenance and emergency repairs where replacing the impeller and housing offers a robust solution for restoring engine cooling.

Those who should look elsewhere include owners of smaller Yamaha engines outside the listed HP range and buyers who require factory OEM certification for warranty reasons. Also, if any customer needs guaranteed perfect fit for every small seal recess, they may want to confirm the O-ring and plate interfaces before committing.

Pros & Cons

Pros

• Comprehensive parts list lets you complete most impeller rebuilds without hunting for extra components.
• Fits a broad range of Yamaha 150-300 HP outboards, simplifying compatibility concerns for common models.
• Includes both structural and sealing components so alignment and fastening can be handled during a single service session.

Cons

• Some customers report fit issues with the small O-ring not seating in the recess, so careful inspection is advised before installation.
• Occasional reports of missing parts or partial kit quality inconsistency mean buyers should inventory the kit on arrival.

Specifications

Product type	Water pump impeller repair kit
Compatible engines	Yamaha 150, 175, 200, 225, 250, 300 HP outboards
Replaces	Yamaha 61A-W0078-A2-00, A3-00, A4-00; 64L-W0078-00-00; 65L-W0078-A0-00
Also replaces	Sierra 18-3396-1; Mallory 9-48618
Kit contents	Impeller, pump cup, housing, wear plate, bolts with washers, gasket, key, O-ring, pin, dowel
Brand	GHmarine

Our Verdict

This impeller kit is good value for DIYers and marine technicians who need a mostly complete replacement for Yamaha midrange and high-power outboards. It bundles the main mechanical and sealing parts and addresses common pump failures, though buyers should verify all small seals and parts on arrival to avoid installation delays.

Frequently Asked Questions

Will this fit my Yamaha 200 HP outboard?
Yes, the kit is specified to fit Yamaha 200 HP outboards and replaces the listed Yamaha part numbers for that range.

Does the kit include the O-ring and gasket?
Yes, both an O-ring and a water pump gasket are included, but customers have reported the O-ring may require verification for correct seating.

Are all fasteners included for installation?
Yes, bolts with washers, a pin and a dowel are supplied so most installations can be completed without sourcing additional hardware.