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Yamaha, Mercury Mariner & Honda 8hp-225hp Thermostat - 60 Degrees (OST6G8)

Genuine Part # : 6G8-12411-01, 66M-12411-01, 825212T02, 19300-ZW9-003

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  • 1 YEAR


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Thermostat opens at 60 degrees.

This part replaces part #: 6G8-12411-01, 66M-12411-01, 825212T02, 19300-ZW9-003, 19300-ZY3-023.

This part suits the following engines: Yamaha 9.9-70hp 4 Stroke 2001-2019, Mercury Mariner 9.9-50hp 4 Stroke 1998-2002, Honda BF8D, BF15D, BF20D, BF25D, BF30D, BF40A, BF40D, BF50A, BF50D, BF60A, BF75D, BF90D, BF200A, BF225A 4 Stroke Models.


About The Brand

Outboard Spares brand of parts are tested in Australia's harsh marine environment with a focus on quality and durability. Outboard Spares parts are used by professional fishermen who depend on their parts to stay on the water and in business. So next time you service your engine choose what the professionals use, choose Outboard Spares.

  • Standard Shipping is free on all orders. Oils & Lubricant products can only be sent via Standard Shipping.
  • Express Shipping is $10 flat rate.
  • Pick up is available from our warehouse at 1/84 Brunel Road, Seaford VIC 3198 between the hours of 8:30am to 3:30pm weekdays. You will be notified by email when your order is ready for pick up.

Delivery Time

Orders are dispatched same business day if ordered before 3:00pm AEDT. All orders are dispatched from Melbourne, Victoria and are sent via Australia Post.

For delivery time estimates with Australia Post please use their delivery calculator here:

If you have any questions relating to shipping, please contact us by emailing

Honda 30 thermostat and gasket

By: on 23 April 2023
I'm very happy with this product as well as the help provided by the sales rep. Initially I mistakenly ordered a 72 degree thermostat... I needed the 60 degree and was happy to have the correct one delivered in a short time.

60°C thermostat

By: on 5 March 2019
This product performed exactly as it should. This company performed as equally well as the thermostat did. Gave me the chance to go fishing again

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