WSM 004-260 Yamaha 1050 / 1100 / 1800 Thermostat – Replaces OEM 6D3-12411-00-00

Keep your Yamaha WaveRunner or sport boat running at its optimal operating temperature with this direct-fit thermostat. Engineered to match OEM specification 6D3-12411-00-00, this WSM 004-260 thermostat provides the same precise coolant regulation as the factory part — protecting your engine from overheating and ensuring peak performance season after season.

Part Information

• WSM Part Number: 004-260
• OEM Part Number: 6D3-12411-00-00
• Compatible Engine Sizes: 1050cc, 1100cc, 1800cc
• Fits: Yamaha WaveRunners & Sport Boats (see full application list below)

Why Replace Your Yamaha Thermostat?

A faulty thermostat is one of the most common causes of overheating in Yamaha marine engines. Symptoms of a failing thermostat include engine overheating warnings, erratic temperature readings, reduced power output, and rough idle at operating temperature. Replacing a worn or stuck thermostat is a straightforward maintenance task that can prevent costly engine damage.

Product Features

• ✔ Direct OEM replacement — no modifications required
• ✔ Precisely calibrated opening temperature for Yamaha 1050, 1100 & 1800 engines
• ✔ Restores proper coolant flow and engine temperature regulation
• ✔ Manufactured to WSM quality standards
• ✔ Matches OEM spec 6D3-12411-00-00

Compatible Applications

This thermostat fits the following Yamaha models:

Always verify your OEM part number before ordering. Cross-reference with your owner's manual or dealer parts lookup to confirm fitment for your specific model year and hull configuration.