Yamaha 61A-85790-01-00 - Thermosensor Assembly

Your Yamaha’s powerhead can idle for hours or rip across open water at 5,000 rpm—so long as it stays in its comfort zone. This thermosensor is the small brass guardian that makes sure it does. Threaded into the cylinder head, it tracks coolant temperature in real time and relays data straight to the ECU and dash alarm. Lose it and you risk silent overheating; swap it in and you restore instant warnings and limp-home protection.

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Key Features & Benefits

• Genuine Yamaha part number and tuning-fork logo laser-etched on the 14 mm hex for a leak-free, OEM fit
• Fast-response NTC element sealed inside a corrosion-proof brass body delivers accurate readings in salt or fresh water
• Waterproof two-pin plug snaps onto the factory harness—no splicing, no guessing
• Includes a fresh Viton O-ring for a five-minute install during your next spark-plug or anode change
• Built to Yamaha’s exacting standards, making it the smart swap whenever you see a flickering temperature gauge or hear the overheat alarm

Replace the sensor once and ride knowing your temperature gauge—and your engine—are exactly where they should be.

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Fits These Yamaha Models

Yamaha Model	Compatible Years
FX1800 WaveRunner FX SVHO	2024
FX1800A WaveRunner FX Cruiser SVHO	2024
FX1800B WaveRunner FX Limited SVHO	2024
GP1800 GP SVHO	2024
VX1050A WaveRunner VX Cruiser	2024
VX1050B WaveRunner VX Deluxe	2024
VX1050C WaveRunner VX	2024
VX1050F WaveRunner VX Limited	2024

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Frequently Asked Questions

What is Yamaha part 61A-85790-01-00?

61A-85790-01-00 is the genuine Yamaha Thermosensor Assembly, designed for the compatible Yamaha applications shown above.

Which Yamaha models fit 61A-85790-01-00?

This part fits FX1800 WaveRunner FX SVHO, FX1800A WaveRunner FX Cruiser SVHO, FX1800B WaveRunner FX Limited SVHO, and other listed Yamaha models. Review the compatibility table above for the complete model and year listing, and confirm your exact application before ordering.

Is 61A-85790-01-00 a genuine Yamaha part?

Yes. This listing is for a genuine Yamaha OEM part or accessory identified by Yamaha part number 61A-85790-01-00.

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WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.