Yamaha - Water Tube Cooling System Component 6S1-44361-12-00. Overview. Cooling issues don't take long to show up when something in the water path isn't right. I've worked on motors where a small restriction in a tube caused temps to creep up faster than expected. When this piece is clean and flowing properly, the engine stays cool and runs like it should all day. It's a simple part, but it's one you rely on every time you're out on the water.. Key Features. • Direct Cooling Flow Path - Channels water efficiently through the engine to regulate temperature.• OEM Fit and Alignment - Matches factory routing for proper installation and flow direction.• Corrosion-Resistant Build - Designed to handle constant exposure to fresh and saltwater environments.• Supports Stable Engine Temps - Helps prevent overheating during extended operation.. Engine & Boat Compatibility. Designed for Yamaha outboard engines with internal water cooling systems. Commonly used across a range of Yamaha outboards whe