278000965 Temperature Sensor for Sea-Doo Speedster 720 1997-1999

Temperature Sensor for Sea-Doo

This temperature sensor for Sea-Doo watercraft, an OEM cross-reference 278000965, monitors engine coolant temperature so the ECU can protect your engine from overheating.

Overview

This temperature sensor for Sea-Doo is a direct-fit replacement for the factory unit found on 720 and other Rotax-powered models. It reads coolant temperature and sends that signal to the engine management system so warning systems and fuel delivery stay accurate. This temperature sensor is built for riders who need dependable engine monitoring on the water.

Built For Performance

• Direct cross-reference to OEM part number 278000965 for a factory-style fit
• Resists corrosion from constant marine water and coolant exposure
• Threaded body for a secure seal in the engine block
• Delivers consistent resistance values across the operating temperature range
• Compact design fits tight engine bay clearances on personal watercraft
• Compatible with the factory wiring harness connector

Fits These Machines

• for Sea-Doo Speedster 720, 1997-1999

On-The-Job Use

• Replacing a failed coolant sensor on a Sea-Doo Speedster 720
• Restoring accurate overheat warning signals on 1997-1999 720-powered boats
• Routine engine maintenance when a sensor reads open or shorted
• Keeping the engine management system informed during extended cruising

Specs At A Glance

Good To Know

Q: How do I know my temperature sensor has failed? A: A failed sensor often triggers a check engine warning, causes erratic gauge readings, or forces the ECU into a protection mode that limits RPM. Testing resistance against the service manual values confirms whether replacement is needed.

Q: Does this sensor need thread sealant when installed? A: Many marine temperature sensors use a dry seal at the threads, so check the service manual before applying any sealant. Over-tightening can damage the fitting, so follow the specified torque value.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.