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Evinrude Johnson 9.5-235hp Thermostat - 143 Degrees Fahrenheit (OST500)

Genuine Part # : 5005440, 434841, 393659, 378065, 508626, 0378065 18-3543

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  • 1 YEAR


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Thermostat opens at 143 degrees fahrenheit.

This part replaces part #: 5005440, 434841, 393659, 378065, 508626, 0434841, 0393659, 0378065, 0508626, 18-3543.

This part suits the following engines:

Evinrude Johnson 9.5hp 1964-1973,
Evinrude Johnson 9.9-15hp 1966-1986,
Evinrude Johnson 20hp 1966-1973 & 1982-2002,
Evinrude Johnson 25hp 1969-2005,
Evinrude Johnson 30hp 1984-2005,
Evinrude Johnson 35hp 1980-2005,
Evinrude Johnson 40hp 1960-1970 & 1984-1988,
Evinrude Johnson E-TEC 40-50hp 2001-2016,
Evinrude Johnson 50hp 1971-1996,
Evinrude Johnson 55hp 1979-1985,
Evinrude Johnson E-TEC 60hp 2001-2016,
Evinrude Johnson E-TEC 75 & 90hp 2004-2016,
Evinrude Johnson 85hp 1973-1978,
Evinrude Johnson 90hp 1979-1994,
Evinrude Johnson 100hp 1979-2001,
Evinrude Johnson 110hp 1986-1992,
Evinrude Johnson 115hp 1977-1994,
Evinrude Johnson E-TEC 115hp 2007-2016,
Evinrude Johnson E-TEC 130hp 2007-2016,
Evinrude Johnson 140hp 1977-1984,
Evinrude Johnson 150hp 1977-1990,
Evinrude Johnson 150-200hp 2007-2016,
Evinrude Johnson 175hp 1977-1990,
Evinrude Johnson 200hp 1976-1985,
Evinrude Johnson E-TEC 200-250hp 2005-2016,
Evinrude Johnson 225hp 1993-2002,
Evinrude Johnson 235hp 1979-1985.


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

Review Evinrude Johnson 9.5-235hp Thermostat - 143

By: on 28 February 2022
I was very happy with the service and all parts was correct and arrived in a reasonable time frame. Im no mechanic by any means but after a couple of YouTube vids I had a crack at it and went to test my work out. The boat motor ran like a dream. Highly recommend your business and service. Thanks a lot outboard spares

evinrude thermostat

By: on 3 February 2022
good product & arrived asap.

e-tec thermostat

By: on 27 January 2021
Right part, right price, no more overheating issues

Service +

By: on 31 December 2019
Communication was excellent and price was competitive. Delivery was fast. Part fitted my outboard perfectly and has been tested and found to work superbly. Recommend this outlet to anyone.


By: on 16 October 2019
Prompt delivery,looks good, happy

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