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Yamaha Thermostats

Thermostat 60°C – Yamaha, Mercury & Honda 6G8-12411-02

SKU: MX6G8-12411-02

$46.85
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The 6G8-12411-02/66M-12411-01 aftermarket outboard thermostat regulates cooling-water flow to maintain correct engine operating temperature. Rated at approximately 60°C / 140°F, it suits a wide range of Yamaha 4-stroke outboards and selected Mercury and Honda applications using the equivalent thermostat.

Key benefits

Key Benefits

  • Aftermarket replacement for 6G8-12411-02
  • 60°C / 140°F opening temperature
  • Helps maintain correct engine operating temperature
  • Controls cooling-water circulation during warm-up and operation
  • Helps prevent over-cooling and poor cold-engine performance
  • Marine-duty brass/metal construction
  • Suitable for numerous Yamaha 4-stroke applications
  • Cross-references selected Mercury and Honda thermostats
  • Ideal replacement during cooling-system servicing.

Compatible Yamaha Outboards

  • The original 6G8-12411-02 is documented on numerous Yamaha 4-stroke engines, including
  • 8–9.9HP
  • F8, F8B, F8BE, F8BM, F9.9A, F9.9B, FT9.9A
  • 20–30HP
  • F20A, F25A, F25AEH, F25AEHTL, F25AET, F25AETL, F25AMH, F25AMHL, F25AMHS
  • FT25B, FT25BED, FT25BET, FT25BETL, FT25BETX
  • F30A, F30AETL, F30AMHDL
  • 40HP
  • F40A, F40B, F40C, F40BETL, F40BMHD, F40BMHDL, F40BWHTL
  • 50HP
  • F50A, F50AEHT, F50AEHTL, F50AET, F50AETL, F50B, F50BET, F50D, FT50B
  • FT50BETL, FT50BETX, FT50C, FT50CETL, FT50CETX
  • 60HP
  • F60A, F60AEHTL, F60AETL, FT60B, FT60BETL, FT60BETX

Broader Current 66M-12411-01 Applications

  • Because Yamaha superseded the 6G8 thermostat family to 66M-12411-01, the current replacement is also used on additional Yamaha engines including
  • F2.5, F4 / F4A / F4B, F5 / F5A, F6 / F6C, F8, F9.9, FT9.9, F15, F20, F25, F30, F40, F50, FT50, F60, FT60, selected F70 applications
  • This broader list describes the current replacement thermostat family, not necessarily engines that originally left the factory with 6G8-12411-02.

Tohatsu Cross Reference

  • 3R3-01030-0, 3NV-01030-0

Mercury / Mariner Outboards

  • Aftermarket interchange catalogues place this 60°C thermostat family on selected Mercury/Mariner 4-strokes, particularly engines sharing Yamaha-derived components.
  • Common Mercury references include
  • 825212, 825212001, 825212T02, 855676, 855676002/3, 855676A1
  • Sierra 18-3541
  • Aftermarket application data describes compatible Mercury 4-stroke engines broadly in the 15–90HP range.
  • This should be treated as model-specific rather than claiming universal 15–90HP fitment.

The same aftermarket thermostat design is cross-referenced to selected Honda BF-series engines through

  • 19300-ZW9-003, 19300-ZY3-023, 19300-881-741, 19300-921-003, 19300-ZW3-023
  • Aftermarket application catalogues extend the thermostat across numerous Honda BF-series engines, but the exact Honda model/year should be checked against the OEM number before ordering.

Important Fitment Information

  • Do not select a thermostat solely by horsepower. Confirm the original thermostat number, engine model and model year.
  • The critical specification for this family is 60°C / 140°F. Installing a thermostat with an incorrect temperature rating can cause the engine to run too hot or too cold.

Signs the Thermostat Needs Replacing

  • Replace or inspect the thermostat if the engine is overheating, running unusually cold, taking too long to reach operating temperature, showing inconsistent cooling-water temperature, suffering salt/corrosion buildup around the thermostat, or during major cooling-system servicing when the thermostat's condition is uncertain.

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