Choosing an outboard motor for a small boat or boat is always about finding a balance between power, weight and cost of operation. 9.8 hp power. It's considered the middle ground for water-powered vehicles, and it's the power limit that allows you to operate a boat without having a category G license, which makes it incredibly popular.
Drivers often choose this class of engines for lightweight aluminum boats, Crimean-class boats or modern, larger-sized PVC boats, a segment that is in the midst of a fierce competition between traditional market leaders and aggressive Chinese brands that offer similar specifications at lower prices.
In this article, we will make a detailed comparison of the technical specifications, reliability and maintainability of top models. You will learn which engine is better for fishing, and which is better for high-speed walks, and what nuances should be paid attention to before buying.
Why 9.8 HP is the perfect choice for small boats
A power of 9.8 horsepower is not a random figure, but a legally and technically sound standard. From a legal point of view, driving a vessel with an engine up to 10 hp (in some classifications up to 8 kW, which corresponds to about 10.8 hp, but 9.8 is a safe standard) does not require registration with a GIMS and a driver's license. This saves time and money for the owner.
Technically, the two-stroke and four-stroke engines in this class have optimal torque, which can plane a PVC boat up to 3.6-4.0 meters long with a full load (two people plus gear), and the more powerful units can be redundant for lighter hulls, creating the risk of tweezing or tipping, while the less powerful simply will not give the desired speed.
An important factor is fuel-efficiencyMotors in this class consume relatively little gasoline, allowing long outdoor activities without the need to bring canisters of half a ton. In addition, the weight of these engines often allows them to be transported in the trunk of a passenger car without the use of a special trailer.
Key Choice Criteria: What to Look at First
When choosing a 9.8 hp engine, you can't rely on marketing promises alone. There are a number of technical parameters that directly affect comfort and durability. First, decide on the type of engine: two-stroke or four-stroke. Two-stroke engines are lighter, cheaper and easier to maintain, but require a mixture of oil and gasoline. Four-strokes are more economical, quieter and more environmentally friendly, but heavier and more expensive.
Note the ignition system. Current models are equipped with electronic CDI or TCI, which ensures stable start-up in all weather. Mechanical systems (magdinos) are a thing of the past, although some budget models still exist. Also critical is the cooling system: water cooling is a mandatory standard, but the quality of pumps and water channels varies from brand to brand.
⚠️ Attention: When buying an engine, be sure to check the availability of a valid certificate of conformity and a product passport. The lack of documents will make it impossible to legally use the engine and its warranty service.
Equally important. gear ratioFor heavy boats, gearboxes with a large gear ratio (for example, 2.08:1) are better suited, which provide better traction at low speeds. For light speed boats, maximum propeller revolutions are more important, so the gear ratio can be less (about 1.85:1).
Top 5 9.8 hp engine models on the 2026 market
The outboard market in 2026 offers a wide range of options, and we selected five models that have proven to be reliable and popular with users, including both time-tested classics and modern developments.
The sales leader remains Yamaha 9.9 GMHSDespite the 9.9 index, it's technically often the same unit as the 15-horsepower models, but with a limiter. It's a two-stroke, two-cylinder engine with excellent traction, and it's chosen for its legendary reliability and high liquidity in the aftermarket.
Four-stroke motors are distinguished Tohatsu MFS 9.8 BThe Japanese assembly, low noise and vibration make it ideal for quiet fishing, heavier than two-strokes, but with much lower fuel consumption and higher life before major repairs.
Chinese brands have also stepped far ahead. Model Hidea HD9.8FHS It's almost a complete replica of the Yamaha, but it's 20-30% cheaper, and build quality has grown over the years, and parts are available, making it a great budget option.
It's also worth mentioning. HDX T 9.8 BMS and Parsun F9.8BMSThese models are often chosen by novice water engines, they are simple, unpretentious to fuel quality (within reasonable limits), and easy to repair in any service.
Secret of engine marking
Many manufacturers use the same piston group for 9.8, 15 and even 20 hp engines. The difference often lies only in the settings of the carburetor and the presence of a speed limiter. Theoretically, removing the limiter, you can get more power, but this cancels the warranty and reduces the engine life.
specifications comparison table
For ease of choice, we have brought the basic parameters of popular models into a single table, which will help you quickly navigate the differences between brands.
| Model | Type of engine | Weight (kg) | Fuel consumption (L/h) | Features |
|---|---|---|---|---|
| Yamaha 9.9 GMHS | two-stroke | 36 | 3.5 - 4.5 | High traction, reliability. |
| Tohatsu MFS 9.8 B | four-stroke | 40 | 1.8 - 2.5 | Silence, economy |
| Hidea HD9.8FHS | two-stroke | 35 | 3.3 - 4.2 | Budget, accessibility |
| HDX T 9.8 BMS | two-stroke | 34 | 3.4 - 4.3 | Simplicity of construction |
| Suzuki DF9.9B | four-stroke | 41 | 2.0 - 2.6 | Electronic injection (in some versions) |
As you can see from the table, two-stroke motors gain weight, which is critical for carrying. Tohatsu and SuzukiThey provide almost two times the fuel economy, which pays off their higher initial cost for several seasons of active operation.
Maintenance and engine life
The durability of a 9.8 hp engine is directly dependent on the quality of service. Unlike cars, there are no complex oil and fuel filtration systems, so the role of the owner in maintenance increases. The basic rule is: never save on oil for the mixture (for 2T) or the regularity of oil change in the gearbox and engine (for 4T).
For two-stroke engines, proper preparation of the fuel mixture is critical. TC-W3The ratio is usually 1:50 (20 ml per 1 liter of gasoline), but for new engines during the break-in period, 1:40 is recommended. Failure to comply with the proportions leads to either candles and silencers or piston bullies.
☑️ Checklist of seasonal services
Four-stroke engines require a change in engine oil every 50-100 hours or once a season, and you also need to monitor the condition of the air filter and spark plugs. Resource A high-quality four-stroke engine before the first overhaul can reach 2000-3000 motor hours, while two-stroke usually go 1000-1500 hours with proper operation.
⚠️ Attention: After each operation in salt water, be sure to wash the cooling system with fresh water. The salt causes instant corrosion of the internal channels, which can lead to overheating and expensive repairs.
Typical problems and ways to solve them
Even the most reliable 9.8 hp engines can be a hassle. One of the common problems is difficulty starting. First of all, check the spark plug: if it's wet, it means the engine has been flooded. You need to dry the cylinder and blow out the candle. If the candle is black, it's too rich or bad oil. A white candle indicates overheating or poor mixture.
The second common problem is overheating. The overheating indicator (if any) or loss of power indicates a malfunction of the pump. Often the cause is trivial - garbage in the water intake or a hose is squeezed out. Regular replacement of the impeller pump (every 2-3 seasons) will eliminate sudden breakages on the water.
Vibration and noise can be increased by wear of exhaust pipe bearings or rod bearings. If the motor starts to growl differently than usual, this is a cause for diagnosis. Ignoring foreign sounds can lead to the inserts turning and the need to replace the crankshaft.
Use a fuel filter with a transparent flask between the tank and the engine, which will allow you to visually monitor the presence of water and dirt in the gasoline, preventing clogging of the carburetor's jelly.
Conclusion: How to make the right choice
Choosing a 9.8 hp engine is an investment in a comfortable rest on the water. If you value the ease, simplicity and plan to use the engine for no more than 30-40 hours a season, take a proven two-stroke from the engine. Yamaha It's a workhorse that won't let you down.
If you fish a lot and often, appreciate the silence on board and are willing to put up with more than 5-7 kg of weight for the sake of fuel economy and smoke - your choice of four-stroke engine from the engine. Tohatsu or SuzukiIn any case, the 9.8 hp class remains the most popular and rational solution for most water engines.
The main conclusion: For rare use and small boats, a two-stroke engine is better suited because of weight and price. For frequent operation and comfort, only a four-stroke one.
Do I need to register the engine 9.8 hp in GIMS?
According to the current legislation of the Russian Federation, boats with an engine of more than 8 kW (about 10.88 hp) are subject to registration. 9.8 hp (about 7.2 kW) motors do not formally require registration of the vessel itself and the availability of management rights if the total weight of the curbed vessel with the engine does not exceed 200 kg.
Which screw is better to choose for the engine 9.8 hp?
A standard propeller usually has a pitch of 8-9 inches for heavy boats and 10-11 inches for light and fast. If the engine does not develop maximum speeds (does not reach 4500-5500 rpm under load), the screw pitch should be reduced. If the revolutions exceed the norm, increase so as not to "twirl" the engine.
Can I use AI-92 gasoline for a 9.8 hp engine?
Most modern two-stroke and four-stroke engines with a capacity of 9.8 hp are designed for AI-92 gasoline. Using AI-95 does not give a gain in power, but can lead to higher temperature operation in carburetor engines. Always follow the manufacturer's instructions, but the AI-92 is the de facto standard for this class.