Thermostat 6H3-12411-11-00

European-made thermostat that closely mirrors the OEM layout (metal body, stainless spring, rubber seal, and 50°C marking). Small differences in the top valve disc and spring seating show it is not the same sub-manufacturer as Yamaha, but overall construction appears high quality among the aftermarket options.

Taiwan-made unit with a thicker cast/machined-looking brass frame, steel spring, copper actuator, and rubber gasket. The construction and marking placement differ notably from the OEM-style stamped frame, so while it should function, it is not an OEM-equivalent build.

Taiwan-made thermostat using a brass frame, copper thermal element stamped 50°C, stainless spring, and a rubber sealing ring. Valve plate geometry and stamping/finish details differ from the Yamaha part, indicating different tooling and slightly less refined manufacturing, but it should serve as a functional replacement.

China-made thermostat kit with branded stamping on the support bridge and a 50°C marking, using the expected wax-pellet style mechanism and a rubber sealing ring. The geometry and surface finish differ from the OEM part, reducing confidence in long-term consistency compared with Japanese/European manufacturing.

We are working hard to determine a rating based on all available information, including product and manufacturing specifications.