Used 25 HP Outboard for Sale in Australia | Find the Right Motor in 2026 🚤

Finding the right used 25 hp outboard for sale can give you excellent boating power without the cost of buying a brand-new engine. 🚤

For Australian boat owners, 25HP is a useful size for many aluminium fishing boats, tinnies, tenders, small runabouts and utility vessels. However, the motor’s age and condition matter just as much as the horsepower.

That is why you should look beyond the advertised price.

A recent Australian listing, for example, showed a 2021 Mercury 25HP four-stroke with a 20-inch shaft, tiller steering and a 25-litre fuel tank for AUD $5,250. Another Australian listing showed a serviced 2006 Mercury 25HP two-stroke for AUD $2,200 with a 90-day warranty.

So, what should you actually look for when comparing a used 25 hp outboard for sale in Australia?

Let’s break it down. ⚓

Find the Best Used 25 HP Outboard for Sale

A good used outboard should offer more than a low purchase price.

Instead, look for the right combination of:

Buying Factor	What to Check
Engine hours	Confirm actual usage
Service history	Look for regular maintenance
Compression	Check cylinder health
Shaft length	Match the boat transom
Cooling system	Confirm strong water flow
Lower unit	Check oil and gear engagement
Propeller	Look for damage or wear
Corrosion	Inspect carefully, especially for saltwater use
Controls	Confirm compatibility
Starting system	Test manual or electric start

A clean engine with documented maintenance can be worth considerably more than a cheaper motor with an unknown history.

For that reason, condition should drive the buying decision | not the sticker price alone.

You can also browse available marine products through the Auto & Co PTY LTD shop.

Why Buy a Used 25 HP Outboard?

There is a simple reason this horsepower class remains popular.

A 25HP engine provides a useful step up from smaller portable motors while remaining relatively compact.

For example, a suitable 25HP can provide:

Advantage	Benefit
More thrust	Better acceleration and load carrying
Compact size	Easier installation
Moderate weight	Less transom load
Good economy	Lower running costs
Simple operation	Ideal for smaller boats
Wide application	Fishing, cruising and utility use

Furthermore, modern four-stroke engines can provide quieter operation and efficient fuel delivery.

A used 25HP can therefore make sense for an owner who wants practical performance without moving into the larger 40HP or 50HP categories.

25 HP Outboard Prices in Australia 💰

Price is one of the biggest reasons buyers search for a used 25 hp outboard for sale.

However, there is no single market price.

Age, technology, engine hours, condition and included equipment can create large differences.

Current Australian listings illustrate this clearly. JV Marine lists a used 2021 Mercury 25HP four-stroke at AUD $5,250, while BoatsOnline currently shows a serviced 2006 Mercury 25HP two-stroke at AUD $2,200.

Example	Year	Type	Listed Price
Mercury 25HP	2021	4-Stroke	$5,250
Mercury 25HP	2006	2-Stroke	$2,200

These are listing examples, not a fixed Australian price guide.

In addition, accessories can change the real value. A motor supplied with a tank, propeller, controls and wiring may be a better purchase than a cheaper bare engine.

Best Brands for a Used 25 HP Outboard

When searching the Australian market, you will commonly encounter brands such as Yamaha, Mercury, Suzuki and Honda.

Each brand has different models and specifications. Therefore, compare the individual motor rather than assuming one manufacturer is always the best choice.

Yamaha 25 HP Outboards

Yamaha’s F25 range focuses on lightweight performance and fuel efficiency. Current Australian Yamaha listings show F25 models with electronic fuel injection and lightweight construction.

Yamaha also offers high-thrust 25HP configurations for applications that need additional low-speed control and pushing power.

Mercury 25 HP Outboards

Mercury has a strong presence in the Australian marine market.

Used examples include both two-stroke and four-stroke engines. As a result, buyers can find different price points depending on age and specification.

Suzuki 25 HP Outboards

Suzuki 25HP models can be attractive for buyers looking for efficient four-stroke technology and modern marine features.

However, always check the exact model number before comparing specifications.

Honda 25 HP Outboards

Honda’s four-stroke marine range is also known for reliability and smooth operation.

Again, the specific model, age and maintenance record matter more than the badge alone.

Used 25 HP Outboard Shaft Length

Shaft length is critical. ⚠️

You can have an excellent 25HP engine and still have the wrong setup if the shaft does not suit your boat.

Common shaft configurations include:

Shaft	Typical Application
15-inch	Short-transom boats
20-inch	Many standard aluminium boats
25-inch	Deeper transoms and selected offshore applications

Do not guess.

Measure your transom and compare the measurement with the engine manufacturer’s recommendation.

A recent Australian Mercury 25HP used listing, for example, specifies a 20-inch shaft.

4-Stroke vs 2-Stroke 25 HP Outboards

You may find both types when searching for a used 25 hp outboard for sale.

Older two-stroke motors can offer a lower purchase price. However, modern four-stroke engines generally appeal to buyers who prioritise fuel economy, quieter operation and newer technology.

Feature	2-Stroke	4-Stroke
Purchase price	Often lower	Usually higher
Weight	Often lighter	Usually heavier
Fuel economy	Generally lower	Generally better
Noise	Generally higher	Generally quieter
Technology	Older on most used models	More modern
Maintenance	Simple in some areas	More systems to maintain
Used availability	Strong	Strong

For example, Australian listings currently show a 2006 Mercury 25HP two-stroke at AUD $2,200, while a 2021 Mercury 25HP four-stroke is listed at AUD $5,250.

Therefore, the question is not simply 2-stroke or 4-stroke.

Instead, ask whether the condition, technology and price make sense for your boat.

What to Check Before Buying a Used 25 HP Outboard 🔧

Never judge a used motor by the cowling alone.

A polished exterior can hide mechanical problems.

Check the Engine Hours

Ask for documented engine hours where possible.

Low hours are useful, but they do not automatically mean a better motor.

A regularly serviced engine with higher hours can be a stronger purchase than a low-hour engine that has sat unused or received poor maintenance.

Check Compression

A compression test provides useful information about the condition of the cylinders.

The readings should be reasonably consistent.

Large differences between cylinders can indicate internal engine problems.

Inspect for Corrosion

Saltwater exposure can cause serious damage over time.

Inspect:

Powerhead
Mounting bracket
Bolts
Wiring
Cooling passages
Lower unit
Steering components

Look closely around areas where salt and moisture can remain trapped.

Inspect the Lower Unit

The lower unit deserves particular attention.

Check the gear oil for contamination. Then inspect the propeller and propeller shaft.

Also test:

Forward | Neutral | Reverse

The gears should engage smoothly without abnormal grinding or knocking.

Test the Cooling System

A healthy cooling system is essential.

Run the engine using the correct water supply and confirm that the cooling system operates properly.

Do not run an outboard dry.

For additional Australian marine safety information, you can refer to the Australian Maritime Safety Authority.

Tiller or Remote Control?

Your boat setup should determine the answer.

A tiller-controlled 25HP is often practical for smaller fishing boats and utility vessels.

Remote control makes more sense when the helm sits forward or inside a centre console.

Therefore, check exactly what comes with the used motor.

A package that includes compatible controls, cables and wiring can save significant additional expense.

Electric Start vs Manual Start

Electric start adds convenience.

It can be especially useful if you start the motor frequently during fishing trips or family boating.

Manual starting, however, can keep the system simpler.

Some engines combine electric starting with EFI, while others use manual starting and simpler systems.

Choose according to your boat, battery setup and intended use.

Is a Used 25 HP Outboard Good for a Tinny? 🎣

For the right boat, yes.

A 25HP can be a strong match for many smaller aluminium fishing boats.

However, you must consider the complete load.

Passengers, fuel, batteries, fishing equipment and safety gear all add weight.

Your boat’s maximum rated horsepower also matters.

Never exceed the manufacturer’s maximum rating.

Australian boat owners also discuss 25HP setups extensively, particularly around 3.9m to 4.1m aluminium boats.

How Much Fuel Does a 25 HP Outboard Use?

There is no single fuel-consumption figure that applies to every boat.

Fuel use changes with:

Engine model
RPM
Boat weight
Propeller
Hull design
Load
Water conditions
Throttle position

Consequently, a correctly matched engine operating at a sensible cruising speed can deliver much better economy than a motor that constantly works near full throttle.

That is why propeller selection and correct engine sizing matter.

When Should You Walk Away? 🚨

Some warning signs deserve serious attention.

Be cautious when you see:

Warning Sign	Possible Concern
Heavy corrosion	Saltwater damage
Milky gear oil	Water intrusion
Uneven compression	Internal wear
Weak cooling flow	Cooling-system problem
Gear grinding	Lower-unit damage
Difficult starting	Fuel or ignition issue
Damaged skeg	Impact damage
Missing serial details	Identification concerns
No service history	Unknown maintenance
Very low asking price	Possible hidden repairs

Furthermore, do not let a seller pressure you into skipping an inspection.

A proper inspection can save you from a much larger repair bill later.

New vs Used 25 HP Outboard

Sometimes the price difference between a used and new engine is smaller than expected.

Therefore, compare the complete package.

Factor	Used	New
Purchase price	Lower	Higher
Warranty	May be limited	Manufacturer warranty
Depreciation	Lower	Higher initially
Condition risk	Higher	Lower
Technology	Depends on year	Latest available
Service history	Must verify	Starts from new
Accessories	May be included	Package dependent

If a used motor has low hours, excellent records and a strong price advantage, it can be an excellent purchase.

On the other hand, if the used engine is close to new-engine pricing, warranty and long-term support can change the calculation.

Find the Right Used 25 HP Outboard for Sale in Australia 🇦🇺

The best used 25 hp outboard for sale is not necessarily the cheapest one you find.

Instead, look for the best overall combination of:

Condition + Hours + Service History + Shaft Length + Controls + Price

That approach gives you a much clearer picture of the motor’s true value.

For more Australian marine buying guides, visit the Auto & Co PTY LTD News & Blog.

You can also learn more about the business through the Auto & Co PTY LTD About page or contact the team through the Australian outboard contact page.

If you’re comparing available engines, the Auto & Co PTY LTD shop is the natural place to start.

Frequently Asked Questions

What is the best used 25 HP outboard for sale?

There is no single best model. Yamaha, Mercury, Suzuki and Honda all have strong options. Focus on condition, service history, hours and correct boat fit.

How much does a used 25HP outboard cost in Australia?

Current listings vary widely. Examples include AUD $2,200 for a serviced 2006 Mercury 25HP two-stroke and AUD $5,250 for a used 2021 Mercury 25HP four-stroke.