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Contact Berthon

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Inboard Engines & Outboard Motor Sales and Support

Berthon offers the sale, installation and support for a  range of inboard or outboard engines powered by  diesel, electric and petrol including:


  • Cox Powertrain
  • Yamaha
  • Mercury
  • Suzuki
  • Torqeedo
  • Tohatsu


  • Volvo Penta
  • Mercruiser
  • Cummins
  • Sole Diesels
  • Yanmar

Berthon engineers are fully trained to Install, Service, Repair and Commission engines for the Leisure, Commercial and Defence sectors. We also offer in-service support packages to a number of our fleet operators throughout the UK.

With our extensive stores back up and dedicated workshops, we can assist with everything from a minor service or supply of parts to design and fit out of large commercial or leisure craft.

Our experienced and knowledgeable team of project managers are on hand to discuss your requirements and offer advice and support to deliver our customers an end-to-end service.

Cox Powertrain Engines

A revolution in marine propulsion the Cox 300hp diesel outboard engine is the most powerful diesel outboard brought to market delivering 300hp at the propeller, built with purpose to deliver exceptional performance while reducing fuel consumption by up to 25%.

Setting new standards in service and support the Cox 300hp diesel outboard comes with a 5 year / 1500 hr recreational warranty or 18 months / 1500hr commercial warranty.

Why Cox?

  • Improved fuel economy
  • Significantly longer service intervals
  • Safety, Availability and Storage of diesel fuel
  • 3 x longer life
  • 480 of torque

COX Powertrain Engines

Cummins Engines

For more than 100 years, Cummins engines have delivered reliable power to help you get the job done. Cummins offers a complete range of variable speed propulsion engines designed specifically for the commercial, recreational and governmental marine user.

All Cummins engines are manufactured to meet current EPA, IMO and EU regulations with the Quantum series product line meeting the stringent Tier 2 emissions standard set out by the US Environmental Standards Agency.

Cummins engines are celebrated for best-in-class performance and reliability.

Cummins Engines –

Cummins / Onan Power Generation

When you need quiet, reliable electrical generation Cummins/Onan set the standard, with more than 100 years of experience. The latest series of Cummins/Onan marine generators provide power between 4kW – 65 kW, backed by the world’s largest distributor network and global warranty network when you purchase Cummins/Onan you buy with confidence.

  • Ignition protected: (IP) options that meets U.S. Coast Guard 33 CFR183 requirements for use in gasoline powered boats.
  • Reliable power: for use in commercial, recreational and government marine applications.
  • Recreational: More comfort and pleasure on the water, with the quietest operation that results in a more enjoyable boating experience.
  • Commercial: Commercial captains know that Cummins power solutions set the standard for durable design, engineered to maximise up-time in the harsh marine environment, voyage after voyage.

Cummins / Onan Power Generation –



Marine engine technology has evolved and Mercury Marine products including the Verado, Pro XS,  Four Stroke & Sea Pro continue to lead the way in both the commercial and leisure sector delivering legendary performance while maintaining superb reliability.

Mercury –


Yamaha offer a full model line-up in four stroke engines from 2.5hp to 425hp that deliver superb fuel economy and cleaner emissions. Outboards of 30hp and higher are equipped with high-performance fuel injection to take that performance to even higher levels. Our Yamaha approved engineers are able to install and service all types of Yamaha outboard engine.

Yamaha –


With nearly 100 years of experience and knowledge in engine development Suzuki provide unprecedented levels of innovation and design ensuring a complete range of outboard motors that provide power, performance and economy to the end user.

Suzuki –

Torqeedo Electric Outboard

Electric outboard engines up to 80HP offering quiet, low fuel cost, light weight, low pollution solution to powering you boat.  The Torqeedo Outboard also benefits from improved manoeuvring and very simple to charge.

Torqeedo Electric Outboard –

Tohatsu Outboard Engines

Tohatsu Outboards are fast becoming one of the most popular outboards in the UK. With an unrivalled price coupled with their good looks, reliability and service & parts back up that’s second to none you can see why.

Tohatsu Outboard Engines –

Sole Inboard Engines

More than 30 years of experience with Mitsubishi engines, give the credibility to our final product. A complete range from 16 to 95 HP gives the best coverage to a wide range of boats for leisure or commercial application. Mitsubishi engines are meaning of reliability, hardiness and durability. These engines are settled in many industrials applications.

Sole Inboard Engines –