Yamaha - SHO Motor Water Inlet Kit Cooling System Component 90891-40791-00. Overview. Cooling issues can sneak up fast, especially when you're running hard or in shallow water. I've seen Yamaha SHO motors lose efficiency just because the water inlet wasn't flowing the way it should. The Yamaha SHO Motor Water Inlet Kit 90891-40791-00 helps restore proper water intake so the engine stays cool and performs consistently. It's one of those upgrades that keeps you running strong when conditions get demanding.. Key Features. • Improved Water Intake Flow - Helps ensure consistent cooling water delivery to the engine.. • SHO-Specific Design - Engineered to match Yamaha SHO motor cooling system requirements.. • Supports Engine Temperature Control - Helps prevent overheating during high-performance use.. • Durable Marine Construction - Built to handle debris, water pressure, and harsh conditions.. • Complete Kit Configuration - Includes components needed for proper installation and function.. En