Mercury 9.9hp Outboard Engine

This engine is supplied in partnership with Cambridge Outboards, an official Tohatsu dealer giving you peace of mind with expert support and matching dealer pricing.

Overview

The Mercury 9.9hp EFI (fuel injected) 4-stroke short shaft outboard is built to deliver the power, thrust and control that wider, heavier boats often require. It’s a great fit for aluminium tiller boats, inflatable soft hull boats, jon boats, utility boats and small sail boats, giving you dependable performance in a compact, practical package.

Key Benefits

• EFI (fuel injected) 4-stroke performance for strong, usable thrust and control
• Choose your start option – pull start, electric start, or pull + electric start
• Flexible control options – tiller steering or remote steering
• F-N-R gearing for practical low-speed handling and docking
• A perfect match for any air or aluminium deck Hydrus from 330 to 420

Dealer Support

This engine is supplied in partnership with Cambridge Outboards, an official Tohatsu dealer, giving you peace of mind with expert support and matching dealer pricing.

Specifications

• HP / kW: 9.9 / 7.3
• Engine type: Inline 2
• Displacement (CID/CC): 12.8 / 208
• Full throttle RPM: 5,000 – 6,000
• Fuel induction system: 2 valves per cylinder, single overhead cam (SOHC)
• Alternator output: 6 amp / 76 watt
• Recommended fuel: Unleaded 90RON minimum
• Recommended oil: Mercury FourStroke Oil 10W-30
• Engine protection operator warning system: Low oil pressure, over-rev
• Starting: Manual, electric
• Steering: Tiller, remote
• Gear shift: F-N-R
• Gearcase ratio: 2.08:1
• Dry weight (lightest model available): 38kg
• CARB star rating: 3
• Bore x stroke: 55 x 44mm
• Ignition: CDI with electronic spark advance
• Fuel system: Carbureted
• Cooling system: Water-cooled with thermostat
• Trim system: Power tilt
• Trim positions: Ratcheting
• Exhaust system: Through prop
• Shallow water drive: Yes
• Shallow water trim range: 16°
• Remote fuel tank standard (gal / L): 3.2 / 12
• Colour: Phantom Black

Shaft Length Options

• Short Shaft: 15″ / 381mm
• Long Shaft: 20″ / 508mm

FAQs

Is this outboard suitable for inflatable boats?

Yes – it’s a great option for inflatable soft hull boats, offering the thrust and control that wider, heavier setups often need.

What start options are available?

You can choose pull start, electric start, or pull + electric start.

Can I run tiller steering, or do I need remote controls?

Both are supported – tiller steering or remote steering.

Does it have reverse?

Yes – it uses F-N-R gearing, which helps with docking and low-speed manoeuvring.

Does it come with a fuel tank?

Yes – a 12L remote fuel tank is supplied as standard.

What Hydrus sizes does this suit best?

It’s a perfect match for air or aluminium deck Hydrus boats from 330 to 420.

Shipping cost

There is a (Pre Delivery Inspection) and shipping charge for this item to mainland UK:

If shipping with a Hydrus then shipping will be:

Please let us know if you prefer to collect for FREE from Worthing, West Sussex or if you’d like to arrange your own delivery.

Please Note: Our warehouse is NOT open to the public.

For shipping overseas please contact us first.

Please see all our Shipping Fees here.

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