The ultimate 10hp outboard engine group test

We pit six of the best 10hp outboard engines on the market against each other for our latest group test

Mariner 9.9hp outboardMariner/Mercury F9.9hp outboard

  • Price: £1,799
  • Top speed: 17 knots
  • 0-top speed: 15.7 seconds
  • Noise (idle/cruise/top): 60/79/92dB(A)
  • Weight: 37.6kg
  • Warranty: 5 years
  • Contact:

Underneath the Mariner or Mercury cowling, you’ll find exactly the same 208cc block as the Tohatsu, but that’s as far as the similarities go.

Key changes include the gearbox and a unique tiller-end gear change. Coincidentally it has the same capacity as the Suzuki and generates 7.28kW (9.76hp) between 5,000 and 6,000rpm. It is a twin cylinder engine with the usual shaft lengths and electric start options.

Mariner 9.9hp outboard - running shotBuild quality: 4/5

The engine block is a tried and tested unit and the rest of the outboard feels very solid, helped by a chunky forward facing carry handle that also protects it when stowed. A five-year warranty is offered on all Mariner and Mercury outboards.

Performance: 5/5

With a top speed of 17 knots, this was the fastest engine on test and acceleration was also impressive. The initial oomph moved it on to the plane swiftly, getting to its top speed in just 15.7 seconds.

Mariner 9.9hp outboard - gear shiftRefinement: 3/5

The Mariner measured 60dB at idle, rising to 79 at cruise and 92 at top. This is almost identical to the Tohatsu and Suzuki, although more than the Yamaha and Honda.

The quality of noise wasn’t irritating, but it didn’t feel as smooth as the two more cultured Japanese offerings.

Ease of use: 5/5

There isn’t a gearshift as such, just a ‘twist-and-go’ throttle that engages gear for you. Twist one way for forward; twist the other way for astern. This takes a bit of getting used to but is ultimately easier to use than a separate lever.

Mariner 9.9hp outboard - laid downA button on the cowling disengages the gears so you can rev it in neutral. It weighs 38kg and the chunky handle offers excellent leverage for lifting.

Verdict: 5/5

The Mariner and Tohatsu are both excellent value but for us the Mariner’s quality build, better acceleration and easier gearshift pushes it ahead of the Tohatsu.

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