Mercury 3.5hp 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 3.5hp 4-stroke outboard delivers lightweight, portable thrust with precise tiller control – an excellent choice for inflatable soft hull boats, small aluminium tiller boats, jon boats, utility boats and compact sailboats. With simple manual starting, 360° turning for tight manoeuvres, and an integrated fuel tank, it’s a tidy, dependable setup for smaller craft.

Key Benefits

• Lightweight portable design at just 41 lbs / 18 kg for easier carrying and storage
• Manual pull start for simple, reliable operation
• Tiller steering with 360° turning for excellent control in tight spaces
• Water-cooled with thermostat for consistent operating temperature
• Above-prop exhaust design
• Great match for smaller Hydrus boats

Dealer Support

This engine is supplied in partnership with Cambridge Outboards, an official Tohatsu dealer, providing expert support and matching dealer pricing.

Specifications

• Power: 3.5hp / 2.6kW
• Engine Type: 1 cylinder, 4-stroke
• Displacement: 85cc
• Full Throttle RPM: 5,000 – 6,000
• Fuel Induction: 2-valve pushrod (overhead valve)
• Fuel System: Carbureted
• Ignition: CDI with electronic spark advance
• Cooling System: Water-cooled with thermostat
• Steering: Tiller with 360° turning
• Gear Shift: F-N (Forward-Neutral)
• Gearcase Ratio: 2.15:1
• Trim System: 4 position (Trim positions: 4)
• Shallow Water Trim Range: 16°
• Exhaust System: Above prop
• Integrated Fuel Tank: 0.3 gal / 1.1L
• Bore and Stroke: 55 x 36 mm
• CARB Star Rating: 3
• Colour: Phantom Black
• Dry Weight (lightest model): 41 lbs / 18 kg

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 a strong match for inflatable soft hull boats thanks to its light weight, simple controls and portable integrated-tank setup.

Does it have reverse?

No – this model uses F-N (Forward-Neutral).

Is it pull start or electric start?

Manual pull start.

Is a long shaft 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 fuel tank (1.1L).

What makes it easy to manoeuvre on small boats?

The tiller steering includes 360° turning, giving you tight control when docking, launching, or manoeuvring in confined areas.

Is it a good match for smaller Hydrus boats?

Yes – it’s well suited to the smaller Hydrus boat sizes where portability and simple handling matter.

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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