We researched and compared the top small 4 stroke outboard motors on the market. Our evaluation is based on manufacturer specifications, published industry standards, and aggregated owner feedback. We focused on portability, reliability, fuel efficiency, and ease of use for small boats, dinghies, and tenders. Below are our top picks, each with honest pros and cons.
| Photo | Product | Score | Buy |
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Tohatsu 6HP 4 Stroke Outboard Motor Best Overall 6 HP, 4-stroke, 110 cc, 57 lbs, 15-inch shaft |
9.0 | 🛒 Check Price |
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Mercury 9.9 HP Pro Kicker 4 Stroke Outboard Best for Trolling 9.9 HP, 4-stroke, 209 cc, 85 lbs, 20-inch shaft |
8.7 | 🛒 Check Price |
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Suzuki DF6A 6 HP 4 Stroke Outboard Lightweight Champion 6 HP, 4-stroke, 138 cc, 55 lbs, 15-inch shaft |
8.4 | 🛒 Check Price |
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Yamaha F2.5 2.5 HP 4 Stroke Outboard Best for Small Dinghies 2.5 HP, 4-stroke, 68 cc, 38 lbs, 15-inch shaft |
8.1 | 🛒 Check Price |
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Honda BF8 8 HP 4 Stroke Outboard Premium Build 8 HP, 4-stroke, 183 cc, 77 lbs, 15-inch shaft |
8.8 | 🛒 Check Price |
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Parsun 9.8 HP 4 Stroke Outboard Budget Friendly 9.8 HP, 4-stroke, 169 cc, 75 lbs, 15-inch shaft |
7.8 | 🛒 Check Price |
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Lehr 2.5 HP 4 Stroke Outboard (Propane) Eco Friendly 2.5 HP, 4-stroke, 63 cc, 37 lbs, 15-inch shaft, propane fuel |
7.3 | 🛒 Check Price |
1. Tohatsu 6HP 4 Stroke Outboard Motor: Best Overall
The Tohatsu 6HP 4 stroke outboard motor is a top choice for small boats, dinghies, and inflatables. In our evaluation, it offers a great balance of power and portability. Owner feedback highlights its reliability and quiet operation, making it ideal for fishing or leisurely cruises. The 57-pound weight is manageable for one person, and the integrated fuel tank simplifies refueling.
However, the 6 HP is limited for heavier loads or planing. If you need more power for a heavier boat or watersports, consider a higher horsepower model. Also, the tiller handle could be more ergonomic for extended use. Skip this if you need to plane a 12-foot dinghy with two people.
- Lightweight at 57 lbs, easy to carry and mount.
- Fuel-efficient with low emissions and quiet operation.
- Integrated fuel tank and easy-start recoil system.
Pros: Excellent fuel economy and low vibration.; Reliable cold start and smooth idle.
Cons: Only 6 HP may not push larger boats well.
2. Mercury 9.9 HP Pro Kicker 4 Stroke Outboard: Best for Trolling
The Mercury 9.9 Pro Kicker is a specialized trolling motor that excels at low speeds. Based on owner feedback, it offers precise control and exceptional fuel efficiency for long days on the water. The high-thrust gearcase provides excellent maneuverability, and the electric start option is a plus for frequent users. Its corrosion resistance makes it suitable for saltwater environments.
However, its weight (85 lbs) is a significant drawback for portability. It is not a motor you want to frequently remove and carry. If you need a lightweight motor for a small inflatable, look elsewhere. Also, the price is higher than comparable 9.9 HP motors, making it a niche choice for serious anglers.
- High thrust gearcase for excellent trolling control.
- Electric start option and alternator for charging.
- Corrosion-resistant components for saltwater use.
Pros: Very smooth and quiet at trolling speeds.; Durable build with good dealer support.
Cons: Heavy at 85 lbs, requires two people to mount.
3. Suzuki DF6A 6 HP 4 Stroke Outboard: Lightweight Champion
The Suzuki DF6A is a standout for those who prioritize weight. At 55 lbs, it is one of the lightest 4-stroke outboards in its class, making it ideal for small inflatables, kayaks, or as a backup motor. Owner reviews praise its easy starting and smooth running. The flush port is a thoughtful feature for post-use maintenance.
However, the 6 HP output is modest. It will not plane a 12-foot aluminum boat with two adults. Also, some users report that the tiller handle could be longer for better control. Skip this if you need more power or have a heavier boat.
- Weighs only 55 lbs, one of the lightest 6 HP 4-strokes.
- Digital CDI ignition for easy starting.
- Freshwater flush port for easy maintenance.
Pros: Very portable and easy to handle.; Smooth and quiet operation.
Cons: Limited power for planing heavier boats.
4. Yamaha F2.5 2.5 HP 4 Stroke Outboard: Best for Small Dinghies
The Yamaha F2.5 is a perfect match for small inflatables, canoes, or as a trolling kicker. Its 38-pound weight makes it the most portable option we evaluated. Owner feedback emphasizes its simplicity and reliability. It sips fuel and is quiet enough for nature observation.
But the 2.5 HP is only suitable for displacement speeds. It will not plane any boat and struggles against strong currents or wind. If you need even minimal planing or have a larger dinghy, consider a 4-6 HP motor. Also, the single-cylinder vibrates more than twin-cylinder models.
- Ultra-light at 38 lbs, easy to carry and store.
- Single-cylinder design with low fuel consumption.
- Forward/neutral shift with twist-grip throttle.
Pros: Extremely portable and simple to operate.; Reliable and low maintenance.
Cons: Very low power, only for small, light boats.
5. Honda BF8 8 HP 4 Stroke Outboard: Premium Build
The Honda BF8 is a premium outboard that prioritizes durability and refinement. In our evaluation, its build quality is exceptional, with corrosion resistance suitable for saltwater. Owner feedback often mentions years of trouble-free operation. The 4-valve design delivers smooth power and excellent fuel economy.
However, the 8 HP output is not class-leading, and the weight (77 lbs) makes it less portable. It also comes at a higher price than comparable motors. If you need the absolute lightest motor or are on a tight budget, consider alternatives. But for long-term ownership and reliability, the Honda is a strong choice.
- Legendary Honda reliability and smoothness.
- Advanced 4-valve combustion for efficiency.
- Corrosion-resistant with multi-layer paint.
Pros: Very durable and long-lasting.; Quiet and fuel-efficient.
Cons: Heavier than competitors at 77 lbs.; Premium price point.
6. Parsun 9.8 HP 4 Stroke Outboard: Budget Friendly
The Parsun 9.8 HP is a budget-oriented outboard that offers solid performance for the price. Based on owner feedback, it provides adequate power for small to medium boats and includes features like electric start at a lower cost than competitors. It is a viable option for occasional use or budget-conscious buyers.
However, durability and parts availability are concerns. Some owners report carburetor issues or corrosion after saltwater use. If you need a motor for frequent or heavy-duty use, we recommend investing in a more established brand. Skip this if you require long-term reliability or dealer support.
- Competitive price for a 9.8 HP 4-stroke.
- Electric start and remote control options.
- Spare propeller and tool kit included.
Pros: Good value for the power output.; Starts reliably and runs smoothly.
Cons: Less durable than major brands; some owner reports of issues.
7. Lehr 2.5 HP 4 Stroke Outboard (Propane): Eco Friendly
The Lehr 2.5 HP propane outboard is a unique eco-friendly option. It eliminates the hassles of gasoline: no mixing, no ethanol problems, and no fuel smell. Owner feedback highlights its instant starting and quiet operation. It is ideal for environmentally conscious users or those who dislike fuel maintenance.
However, the 2.5 HP is even less powerful than its gasoline counterparts due to propane’s lower energy density. It may struggle in windy conditions or with heavier loads. Also, finding small propane cylinders can be inconvenient, and the cost per hour is higher than gasoline. Skip this if you need reliable power or plan to use the motor frequently.
- Runs on propane (1 lb disposable cylinders or refillable tank).
- No ethanol issues, no fuel mixing, no spillage.
- Lightweight at 37 lbs and very quiet.
Pros: Clean burning and low maintenance.; Instant start and no carburetor cleaning.
Cons: Lower power output than similar gasoline models.; Propane availability and cost can be inconvenient.
Frequently Asked Questions
What size small 4 stroke outboard do I need for my boat?
Consider your boat’s weight and length. For dinghies under 10 feet and light loads, 2.5-4 HP is sufficient. For 10-12 foot boats or planing needs, 6-9.9 HP is recommended. Check your boat’s maximum horsepower rating on the capacity plate.
Are 4 stroke outboards better than 2 stroke?
4 stroke outboards are generally more fuel-efficient, quieter, and produce fewer emissions. They also don’t require oil mixing. However, they are heavier and more expensive than comparable 2 stroke motors. For small motors, 4 stroke is often preferred for environmental and noise reasons.
How do I maintain a small 4 stroke outboard?
Regular maintenance includes changing the gear oil annually, checking the propeller for damage, flushing with fresh water after saltwater use, and storing with fuel stabilizer. Refer to the owner’s manual for specific intervals.
Can I use a small 4 stroke outboard in saltwater?
Yes, but you should flush the motor with fresh water after each use. Many models have corrosion-resistant materials, but regular rinsing extends life. Some motors are specifically designed for saltwater with extra protection.
What shaft length do I need?
Measure the transom height of your boat. A 15-inch shaft is standard for small inflatables and dinghies. For boats with higher transoms, a 20-inch shaft may be needed. The anti-ventilation plate should be even with the bottom of the hull.
Our Verdict
Our top pick is the Tohatsu 6HP 4 Stroke Outboard for its excellent balance of power, weight, and reliability. It suits most small boat owners. The runner-up is the Mercury 9.9 Pro Kicker for anglers needing precise trolling control, despite its weight. Choose based on your specific power and portability needs.
