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Yamaha 40-50hp 2 Stroke Service Kit (OSSK11)

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  • Free Shipping


  • 1 YEAR


  • ISO 9001 Certified
    ISO 9001


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This kit includes:
1 x 6H4-W0078-00 Waterpump Kit (OSWK6H4)
1 x 6E5-12411-30 Thermostat (OST6E5)
1 x 6J8-12414-A0 Thermostat Gasket (OSTG6J8)
2 x 90430-08020 Lower Unit Drain Screw Washer (OSDW802)
3 x B7HS-10 NGK Spark Plugs

This part suits the following engines: Yamaha 40-50hp 2 Stroke 3 Cylinder 1984-1994.


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

Great stuff

By: on 17 March 2021
Awesome service and great parts, fitted my 50DETO perfectly.

Excellence exemplified

By: on 11 July 2020
Quality products, fast shipping, exactly what I was after and at an unbeatable price. Couldn’t ask for more and will be sure to use them for all my other outboard spares

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