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Yamaha & Honda 9.9-200hp Thermostat - 50 Degrees (OST6E5)

Genuine Part # : 6E5-12411-30, 688-12411-11, 6H3-12411-11, 19300-ZY6-003

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  • 1 YEAR


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Thermostat opens at 50 degrees.

This part replaces part #: 6E5-12411-30, 688-12411-11, 6H3-12411-11, 19300-ZY6-003, 19300-ZV5-305.

This part suits the following engines: Yamaha 9.9-15hp 2 Stroke 1997-2017, Yamaha 20-25hp 2 Stroke 2 Cylinder Twin Carby Model 1995-2015, Yamaha 30hp 2 Stroke 3 Cylinder 1993-2014, Yamaha 40-90hp 2 Stroke 1984-2014, Yamaha 115-200hp 2 Stroke 1984-2014, Honda BF75 to BF150 4 Stroke 2007-2014.


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 or Express Shipping is $10 flat rate.

Oils & Lubricants can only be sent via Standard Shipping.

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

20 hp yammy thermostat

By: on 20 August 2021
Worked fine.. Large seal covered minor corroded section of housing seat... Excellent service. Order deliver within day or so.


By: on 29 April 2021
Excellent service,prompt delivery and correct product for job.


By: on 29 March 2021
Thermostat was the correct part, individually packaged and recieved on time and undamaged.

Job done

By: on 3 July 2019
Easy to identify on website and really quick delivery to get on with the job, they are slightly different (in appearance and mechanism) to the OEM valves they are replacing (that were ~10+yrs old), but fit perfectly. Installed and up and running again.

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