Yamaha - Thermosensor Assembly Temperature Sensor Component 6C5-85790-00-00. Overview. Temperature issues aren't always obvious until the alarm goes off-or worse, it doesn't. This thermosensor is what keeps track of engine heat and lets the system know when something's off. I've seen bad sensors give false readings or miss overheating altogether, which can turn into a real problem fast. Keeping a reliable sensor in place gives you peace of mind that the motor's running where it should.. Key Features. • Accurate Temperature Monitoring - Measures engine heat and sends signals to the system.. • Engine Protection Support - Helps trigger warnings to prevent overheating damage.. • OEM Fit Accuracy - Matches Yamaha factory specs for proper installation and performance.. • Durable Sensor Construction - Built to handle heat, moisture, and marine conditions.. Engine & Boat Compatibility. Verify compatibility with your specific Yamaha outboard model and part number before installation.. FAQs. Q1: