Mercury 4hp 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 4hp 4-stroke outboard is a lightweight, portable engine built for smooth, quiet operation and easy handling. With through-prop exhaust for reduced noise, simple tiller control, and practical gearing, it’s a great fit for aluminium tiller boats, inflatable soft hulls, jon boats, utility boats and small sailboats.

Key Benefits

• Lightweight 4-stroke design for easier carrying, loading and storage
• Through-prop exhaust for extra-quiet operation
• Simple manual pull start for no-fuss use
• Tiller steering for straightforward control on smaller craft
• F-N-R gearing for better low-speed handling and docking
• Water-cooled with thermostat for consistent operating temperature
• Integrated fuel tank for tidy, portable setup with optional external tank support

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

• Power: 4hp / 2.9kW
• Engine Type: 1 cylinder, 4-stroke
• Displacement: 123cc
• Full Throttle RPM: 4,500 – 5,500
• Fuel Induction System: 2-valve pushrod (overhead valve)
• Fuel System: Carbureted
• Starting: Manual
• Steering: Tiller
• Gear Shift: F-N-R
• Gearcase Ratio: 2.15:1
• Engine Protection Warning System: Low oil pressure, over-rev
• Cooling System: Water-cooled with thermostat
• Ignition: CDI with electronic spark advance
• Trim Positions: 6
• Shallow Water Drive: Yes
• Shallow Water Trim Range: 16°
• Exhaust System: Through prop
• Integrated Fuel Tank: 0.3 gal / 1.1L
• Optional Fuel Tank: 3.2 gal / 12L
• Bore and Stroke: 59 x 45 mm
• CARB Star Rating: 3
• Dry Weight (lightest model): 25kg
• Colour: Phantom Black

Shaft Length Options

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

Fuel and Oil Recommendations

• Recommended Fuel: Unleaded 90RON minimum
• Recommended Oil: Mercury FourStroke Oil 10W-30

FAQs

Is this outboard suitable for inflatable boats?

Yes – it’s well suited to inflatable soft hull boats thanks to its portable weight, quiet through-prop exhaust and simple tiller operation.

Is it pull start or electric start?

This model is manual pull start.

Does it have reverse?

Yes – it has F-N-R (Forward-Neutral-Reverse), which is helpful for manoeuvring and docking.

Is a long shaft version available?

Yes – long shaft (20″ / 508 mm) is available, alongside the short shaft (15″ / 381 mm).

Does it have an internal fuel tank?

Yes – it includes an integrated 1.1L fuel tank, and it also supports an optional 12L external tank.

What makes it quieter than some small outboards?

It uses a through-prop exhaust, designed for extra-quiet operation.

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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