Water Pump Impeller Kit – Fits Yamaha F50A 4-Stroke (Replaces Yamaha 6BG-W0078-01-00, Sierra 18-3434) 3.6HP Unbolt and carefully lift the

Unbolt and carefully lift the old water pump housing

Reconnect any hoses or sensors that were removed

Visually comparing the old pump to our product photos can also help confirm fitment

the Woodruff key (664-44338-00-00) is critical

Water Pump Impeller Kit – Fits Yamaha F50A 4-Stroke (Replaces Yamaha 6BG-W0078-01-00, Sierra 18-3434) 3.6HP Unbolt and carefully lift theProduct Details This Water Pump Impeller Kit provides a complete solution for servicing the water pump on Yamaha 4 stroke 4050 HP outboards, including models F40, F50A (19912007), F30LA, and F40LA. It is designed to restore cooling system performance and prevent engine overheating. It serves as a direct replacement for Yamaha part numbers 6BG W0078 01 00 and 6BG W0078 00 00, as well as aftermarket equivalents Sierra 18 3434, JLM YHJB 6BG, and