Outboard Thermostat 50°C (122°F) for Select Yamaha 2-Stroke VZ/Z/LZ 200–300 HP and 4-Stroke F115/LF115 115 HP Engines

Product Details

This aftermarket replacement outboard thermostat opens at 50°C (122°F) and is intended for selected Yamaha 2-stroke VZ, Z and LZ 200–300 HP engines and selected Yamaha 4-stroke F115 and LF115 115 HP engines. The thermostat helps regulate engine operating temperature when the exact engine model and year match the compatibility information below.

The applicable Yamaha reference numbers are 60V-12411-00-00 for the listed 2-stroke applications and 68V-12411-00-00 for the listed 4-stroke F115/LF115 applications. The replacement thermostat is supplied as a thermostat only unless the order or package description specifically states otherwise.

• Replacement thermostat for selected Yamaha outboard cooling systems.
• 50°C (122°F) opening temperature.
• Direct-replacement style for the specified applications.
• Verify the complete engine model, year and original part number before ordering.

Part Number Matrix

These references identify the application covered by this replacement thermostat. Part-number references should be checked against the engine model and year, not used alone to establish fitment.

Engine & Model Compatibility

Fitment depends on the exact model and year. The catalog occurrences below show the thermostat in the corresponding Yamaha engine diagrams. Confirm the model designation and original thermostat reference before ordering.

Yamaha 2-Stroke Models — Reference 60V-12411-00-00

Yamaha 4-Stroke Models — Reference 68V-12411-00-00

Technical Specs

Product Type

Outboard engine thermostat

Installation

Direct replacement for the specified applications

Opening Temperature

50°C (122°F)

Application

Selected Yamaha 2-stroke VZ/Z/LZ 200–300 HP and 4-stroke F115/LF115 115 HP engines

Manufacturer References

60V-12411-00-00 and 68V-12411-00-00, according to application

Construction

Aftermarket replacement component; material and finish may vary by production batch

What’s in the Box

• 1 x Outboard thermostat

A gasket or seal is not confirmed as included with this thermostat-only listing. Inspect the original seal and obtain the correct replacement separately if required by the engine service procedure.

Installation Notes

1. Allow the engine to cool completely before beginning work.
2. Disconnect the battery and follow the engine manufacturer’s safety procedures.
3. Locate the thermostat housing or cylinder-head thermostat cover for the specific engine.
4. Place a suitable drain pan beneath the work area and remove the cover carefully.
5. Note the orientation of the existing thermostat before removal.
6. Remove the old thermostat and inspect the mating surfaces and seal.
7. Clean the housing and cover surfaces without damaging them.
8. Install the replacement thermostat in the correct orientation. Use a new seal or gasket when required by the service information.
9. Reinstall the cover and tighten fasteners to the manufacturer’s specified torque.
10. Reconnect the battery, restore the cooling system as applicable, run the engine, and check for leaks and proper temperature control.

Use the Yamaha service manual for the exact model and year for torque values, sealing requirements and cooling-system procedures.

Troubleshooting & FAQ

Safety & Important Info

• Never work on a hot engine or pressurized cooling system.
• Verify the exact engine model, year, stroke and original part reference before purchase.
• Do not rely on horsepower alone to establish compatibility.
• This is an aftermarket replacement, not a Yamaha OEM component.
• Professional installation is recommended when the correct procedure or torque specification is uncertain.

About Sea Sierra

• Marine replacement parts selected for specified engine applications.
• Clear cross-reference and fitment information to support accurate ordering.
• Customer support for product and application questions.