68-12413-00-1S Yamaha Thermostat Cover | Genuine Used Part

🔧 Product Description

Genuine Yamaha Thermostat Cover - Catalogue Part Number: 688-12413-00-1S

A genuine Yamaha thermostat housing cover for selected three-cylinder, V4 and V6 carburetted and HPDI two-stroke outboards.

The listing reference 68-12413-00-1S appears to be a shortened or incomplete version of Yamaha catalogue number 688-12413-00-1S. The number and physical casting should be checked before installation.

⚙️ Key Features

• Genuine Yamaha cooling-system component
• Catalogue reference 688-12413-00-1S
• Retains the thermostat within the cylinder-block cooling passage
• Accepts the matching thermostat-cover gasket
• Used across multiple Yamaha two-stroke engine families

🚤 Compatibility

Commonly used on

• Yamaha two-stroke cylinder-block thermostat assemblies
• Selected standard and counter-rotation outboards

Typically suits

• Engine models:
• Yamaha 85A / 85AET
• Yamaha 90A / 90AETO
• Yamaha 150HP and L150HP V6 two-strokes
• Yamaha 175HP V6 two-strokes
• Yamaha 200HP and L200HP V6 two-strokes
• Yamaha Z150, Z175 and Z200 HPDI engines where 688-12413-00-1S is shown
• Standard and Saltwater-series variants using the same thermostat housing
• HP Range: Approximately 85HP - 200HP
• Engine Type: Yamaha three-cylinder, V4 and V6 two-stroke outboard
• Year Range: Approximately late 1980s-2012, dependent on model and serial number

🔌 Function

The cover closes the thermostat cavity and holds the thermostat and seal against the cooling passage. It allows the thermostat to regulate engine temperature by controlling water flow through the cylinder block.

⚠️ Common Signs of Failure

• Cooling water leaks around the cover
• Cover is cracked or distorted
• Corrosion damages the gasket surface
• Mounting threads or bolt holes are damaged
• Engine temperature becomes unstable because the thermostat cannot seal correctly

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 688-12413-00-1S current documented OEM reference
• 68-12413-00-1S supplied abbreviated inventory reference

OEM / Related Numbers

• 688-12413-00-1S
• 68812413001S
• 688-12414-A1 related thermostat-cover gasket
• 6E5-12411-01 related thermostat
• Related thermostat seal and retaining components

Aftermarket / Verified Equivalents

• Recmar: REC688-12413-00-1S
• No aftermarket equivalent

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated