Genuine Tohatsu BFT150A Thermostat 50°C HZY6-19300-003

GENUINE TOHATSU 50°C THERMOSTAT ASSEMBLY

Genuine thermostat assembly for selected Honda-built Tohatsu BFT150A four-stroke outboards. It regulates coolant flow through the cylinder-head cooling circuit so the engine reaches and maintains its designed operating temperature.

KEY FEATURES

• Genuine Tohatsu replacement thermostat
• Nominal opening temperature: 50°C (122°F)
• Installed in the chain-case / thermostat circuit
• Direct reference to Honda Marine OEM 19300-ZY6-003
• Supplied as one thermostat assembly; seals and cover parts are not included unless shown

TECHNICAL SPECIFICATIONS

• Component type: wax-element cooling-system thermostat
• Opening temperature: 50°C / 122°F
• Application: four-stroke outboard engine cooling system
• Tohatsu OEM reference: HZY6-19300-003
• Honda Marine cross-reference: 19300-ZY6-003
• Quantity: 1 thermostat assembly

TOHATSU ENGINE COMPATIBILITY

Verified application:

• Tohatsu BFT150A 150 HP four-stroke — selected 2016–2022 production diagrams

Important: model year alone is not sufficient. Confirm the complete engine model, serial-number range and the thermostat reference in the parts diagram before ordering. This is not the thermostat used on MFS2.5–MFS8 portable outboards.

HONDA MARINE COMPATIBILITY

Honda reference 19300-ZY6-003 is used on selected BF75D, BF80A, BF90D, BF100A, BF115D, BF135A and BF150A four-stroke engines. Exact application varies by model suffix and serial number.

The BF115/BF135/BF150 cooling circuit can contain more than one thermostat with different references. Match the thermostat position and OEM number—not horsepower alone.

CHECK BEFORE ORDERING

• Read the full model designation from the engine identification plate.
• Record the frame/serial number and production year.
• Confirm reference HZY6-19300-003 or Honda 19300-ZY6-003 in the correct thermostat position.
• Inspect the thermostat-cover gasket, spacer and sealing ring; order separately if required.

FREQUENTLY ASKED QUESTIONS

DOES THIS FIT TOHATSU MFS2.5–MFS8 ENGINES?

No. Those portable engines use different thermostat components. This part is for selected Honda-built BFT applications.

WHAT TEMPERATURE DOES IT OPEN AT?

The nominal opening temperature is 50°C (122°F).

ARE THE GASKET AND COVER INCLUDED?

No. The listing is for one thermostat assembly unless additional items are specifically shown. Reuse parts only if the service manual permits it.

WHY MUST I CHECK THE SERIAL NUMBER?

Thermostat position and part reference can change between model suffixes and production ranges. The serial number is the safest way to confirm the correct exploded diagram.