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Yamaha Gaskets

Thermostat Cover Gasket 688-12414-A1

SKU: YA688-12414-A1

$10.75
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Maintain a reliable cooling system with the Yamaha 688-12414-A1 thermostat cover gasket, available from Port O' Call Boating in Warana on the Sunshine Coast. Designed for selected Yamaha 75HP to 225HP 2-stroke outboard engines, this replacement gasket provides a secure seal between the thermostat cover and engine housing. Ideal for routine thermostat servicing, cooling system repairs and maintenance, it helps prevent water leaks and maintain proper engine cooling performance.

Key benefits

Key Benefits

  • - Replacement thermostat cover sealing gasket
  • - Helps prevent cooling water leaks
  • - Suitable for selected 75HP–225HP 2-stroke outboards
  • - Ideal for thermostat replacement and cooling system servicing
  • - Replaces several earlier OEM gasket references
  • - Suitable for standard 2-stroke and selected HPDI engines
  • - Direct replacement where OEM part number matches

Specifications & Dimensions

  • - Part Number: 688-12414-A1
  • - Full OEM Number: 688-12414-A1-00
  • - Product Type: Thermostat Cover Gasket
  • - Application: Outboard Engine Cooling System
  • - Engine Type: 2-Stroke
  • - Compatible Horsepower Range: Selected 75HP–225HP

Compatible Outboard Motors

  • Yamaha 2-Stroke Outboards
  • - 75HP: 75A, E75B, 75C
  • - 80HP: 80A
  • - 85HP: 85A
  • - 90HP: 90E, 90A
  • - 100HP: 100A
  • - 115HP: 115E, 115A, E115A, 115B, 115C
  • - 130HP: 130B
  • - 140HP: 140A, 140B, 140C
  • - 150HP: 150E, 150A, 150C, 150F, 150G, D150H, 150J, 150L, D150N
  • - 175HP: 175A, 175B, 175D, 175F
  • - 200HP: 200E, 200A, 200B, 200C Pro V 200, 200F, 200G, 200J
  • - 220HP: 220A
  • - 225HP: 225A, 225B, 225D
  • Yamaha HPDI 2-Stroke Outboards
  • - 150HP: Z150P, Z150Q
  • - 175HP: Z175G, Z175H
  • - 200HP: Z200N, Z200P
  • These model designations are listed in an Australian aftermarket fitment catalogue. Compatibility is dependent on the exact engine model and production year.

Cross-Reference & Replacement Part Numbers

  • Yamaha OEM
  • - 688-12414-A1
  • - 688-12414-A1-00
  • - 688-12414-A0
  • - 688-12414-00
  • - 688-12414-00-00
  • Aftermarket
  • - Sierra Marine 18-0844

Signs the Thermostat Gasket Needs Replacing

  • - Cooling water leaking around the thermostat cover
  • - Visible deterioration, cracking or splitting
  • - Flattened or compressed gasket material
  • - Corrosion or mineral deposits around the thermostat housing
  • - Gasket damage during thermostat removal
  • - Evidence of previous cooling system leaks

Important Fitment Information

  • - Confirm the original gasket part number is 688-12414-A1 or an approved replacement.
  • - Check engine model, production year and serial number.
  • - Clean both sealing surfaces before installation.
  • - Replace damaged gaskets whenever the thermostat housing is removed.
  • - Do not reuse a compressed, torn or deteriorated gasket.
  • - Confirm the correct thermostat and gasket combination for your engine.
  • - Not suitable for every Yamaha outboard within the listed horsepower range.

Shipping

Ships Australia-wide