Yamaha - Thermosensor Assembly - Engine Temperature Sensor - 61A-85790-01-00

Overview

Overheating isn’t always obvious until it’s already a problem, and that’s where this sensor earns its keep. It threads right into the engine and keeps a constant eye on temperature while you’re running. If things start getting too hot, it feeds that info straight to your system so you get a warning before damage sets in. It’s a small part, but it’s one of those pieces you want working right every time you’re on the water.

Key Features

• Real-Time Temperature Monitoring – Tracks engine heat continuously and relays accurate data to the system.

• Fast-Response Sensor Core – Designed to react quickly to temperature changes for early warning protection.

• Plug-and-Play Connection – Connects directly to the factory wiring harness without modifications.

• Corrosion-Resistant Build – Brass construction helps maintain accuracy in both freshwater and saltwater conditions.

Engine & Boat Compatibility

Compatible with select Yamaha outboard engines. Always verify fitment using your engine model and specifications before installation.

FAQ

Q: What are signs this thermosensor is failing?
A: False alarms, no overheat warning, or inconsistent temperature readings are the most common signs.

Q: Is this the same as a thermo switch?
A: No, this sensor provides continuous temperature data, while a switch typically triggers at a set point.

Q: How hard is it to replace?
A: It’s usually a quick job—just remove the old sensor and thread in the new one, depending on access.

Q: Do I need to use sealant when installing it?
A: Typically yes, a proper thread sealant helps prevent leaks and ensures accurate readings.

Q: Should I replace this during routine maintenance?
A: It’s a good idea if you’re troubleshooting cooling issues or doing a full tune-up

• Supersessions
  61A-85790-01-00, 61A-85790-01-00