Choosing a power unit for an inflatable vessel often becomes a difficult dilemma between budget and the desire to get the most performance. In the segment of engines with a capacity of about 10 horsepower, Chinese manufacturers offer a unique ratio of price and traction specifications, especially when it comes to two-stroke models. two-stroke The engine provides the same speed at the start and ease, which is so appreciated by owners of light swimming facilities.
The 9.8 hp power is not chosen by chance: it is a threshold value that allows you to drive a boat without mandatory registration with the GIMS, if the total weight of equipment and passengers does not exceed the established norms. Modern Chinese brands have learned to make reliable copies of Japanese and European engines, introducing their own improvements in the cooling system and carburetion. The market is full of offers, but only models deserve the attention of an experienced boater.
In this article, we will analyze in detail the technical nuances, compare the leaders of the industry and answer the question whether it is worth saving on the purchase of a "Chinese" or better to overpay for a proven brand. Two-stroke engine It requires a specific approach to service, which will also be discussed below.
Advantages of two-stroke cycle in Chinese performance
Two-stroke engines are power-to-power, and with the same displacement, they deliver nearly one and a half times as much power as a four-stroke engine. Chinese engineers are betting on simplicity: the absence of a complex gas distribution mechanism reduces the weight of the unit and makes it easier to transport. For inflatable boats, every kilogram on the transompane matters.
Besides, two-stroke It allows the engine to operate in any position, which is critical in sharp rolls or in shallow waters. The oil mixes with gasoline to lubricate rubbing parts, so the risk of oil starvation at extreme inclinations is minimal.
⚠️ Attention: Using pure gasoline without adding a special two-stroke oil is guaranteed to lead to piston group bullies after a few minutes of operation.
Chinese engines are often equipped with membrane-type carburetors that work steadily even in high rolls, making them ideal for fishing, where a boat can stay at anchor against the current or wave for long periods of time. Easy maintenance is another big plus: if it breaks away from civilization, it is easier to make such a unit than a high-tech injector engine.
Overview of market leaders: Hidea, Sea-Pro and Tohatsu (OEM)
Among the many brands represented in the domestic market, several companies that have established themselves as manufacturers of high-quality equipment stand out. Hidea Often referred to as the “Chinese Yamaha” for good reason: many of their models are replicas of Japanese engines assembled in their own factories with quality control, the engines of this brand are famous for good traction and reliable ignition system.
Company Sea-Pro It offers a wide range of models, where 9.8 hp is a place of honor, and its engines are often equipped with electronic throttle control, which is rare in the budget segment, allowing for more smooth speed adjustment, which is important when trolling or maneuvering in narrowness, the quality of casting and painting in this brand is usually above the average market.
We must not forget about the engines produced under the brand. TohatsuAlthough technically a Japanese brand, production is often localized in China, and these engines combine Japanese technology with Chinese labor costs, and are considered the benchmark of reliability in the low-power class and often have higher resource life. piston-group compared to purely Chinese counterparts.
Technical specifications and comparison of models
When choosing a 9.8 hp engine, you need to pay attention not only to the declared power, but also to the displacement, weight and type of ignition system. Most models in this class have a volume of about 169 cubic centimeters, which is the standard for this power range. The weight of a dry motor usually varies from 26 to 30 kilograms, which allows one person to lift it per transom.
The gear ratio is important. Heavy boats or full-load glitter modes are better suited to gearboxes with a higher gear ratio, which provide better propeller traction. Chinese manufacturers often use unified gearboxes, which makes it easier to find parts, but can affect the noise of the work.
The secret to increasing the resource
Running the engine on the enriched mixture (a ratio of 1:25 instead of the regular 1:50) in the first 5-10 motor hours allows the piston rings to properly wipe themselves, which will increase the total engine life by 30-40%.
Below is a comparative table of popular models available on sale, and the data may vary slightly depending on the year of release and the specific modification.
| Model | Workload (cm3) | Weight (kg) | Type of management | Features |
|---|---|---|---|---|
| Hidea HD9.8FHS | 169 | 27 | tiller | Electronic ignition, 2 carburetors |
| Sea-Pro T 9.8S | 169 | 28.5 | tiller | Reinforced lower unit, quiet move |
| Parsun T9.8BMS | 169 | 26 | tiller | Budget series, simple construction |
| Tohatsu M9.8B2 | 169 | 27 | tiller | Japanese Quality Control (Assembly of the PRC) |
Fuel consumption and efficiency of operation
The question of appetite is always acute, especially when planning long-distance hikes: two-stroke engine 9.8 hp on average consumes from 3 to 4 liters of fuel mixture per hour at full gas. When driving at half strength, which is often the optimal mode for planing a light boat, the flow drops to 1.5-2 liters. These are quite acceptable figures for outdoor activities.
Chinese Mikuni carburetors or their quality copies allow you to fairly accurately dose the mixture, but over time, adjustment may be necessary. Fuel consumption It depends on the quality of the mixture and the condition of the spark plugs. The use of low-octane gasoline can lead to detonation and overconsumption, so you should not save on fuel.
To prepare a quality fuel mixture, use a measuring tank with a scale, rather than pouring oil on the eye. Accuracy ratio 1:50 is critical for the engine.
A 12-liter tank, often bundled or bought separately, can travel about 60-80 kilometers in cruising mode, and a four-stroke equivalent of the same power would be about 20-25% more economical, but would lose out on acceleration.
Reliability and Typical Problems of Chinese Engines
Despite the progress, Chinese motor vehicles still have their own "childhood diseases": most often owners face problems of the cooling system, namely, clogging of the control hole ("pistol"), sand or algae can block the flow of water, which will lead to overheating, regular inspection of the water jet is a mandatory procedure before each release.
The second common problem is the quality of fasteners. screws and nuts can unscrew spontaneously due to vibration. Experienced users recommend immediately after purchase to stretch all available connections and use a thread lock.
⚠️ Note: When buying an engine, be sure to check the availability of a valid warranty and service centers in your area.
The ignition system in modern models (CDI) is quite reliable, but is afraid of moisture. If the motor is stored for a long time in the garage, it is recommended to lubricate the electrical contacts with a spray-protection against corrosion. The mechanical part - the crankshaft and rods - with proper break-in and lubrication, it goes for a very long time, sometimes surpassing the resource of some European brands.
Instructions for running and first start
Proper breaking in is the key to a long life of your new engine. Don't give it full gas right after you buy it. It takes 5 to 10 hours to grind parts. It's recommended to keep the speeds in the range of 2000-3000 per minute for periodic load changes in the first hours of operation, which allows the piston rings to spread evenly across the cylinder mirror.
☑️ Checklist of first launch
The fuel mixture for running should be made slightly richer in oil than the instructions recommend. A ratio of 1:40 or even 1:35 will help to better lubricate rubbing vapors in the initial period. After the first 5 liters of produced gasoline, it is advisable to replace spark plugs, as they can form a garlic from laundry.
During the break-in, listen carefully to the engine. Extraneous knocking, metal ringing or a sharp change in the color of the exhaust (black smoke after warming up) may indicate defects in the assembly, in which case operation should be stopped and contact the service.
High-quality break-in on an enriched mixture and without overloads increases the life of the piston group of the Chinese engine by 1.5-2 times.
Tips for maintenance and winter storage
Two-stroke engines require regular maintenance. After each release to salt water, the engine must be washed with fresh water, plugged in a flushing plug or put lower unit in a barrel. Salt aggressively corrodes aluminum alloys and cooling system parts. Even if you've been swimming in fresh water, preventive flushing is not a problem.
Before long-term storage (winter), be sure to make all the gasoline from the carburetor or add a fuel stabilizer to the tank. The remaining gasoline oxidizes over time and forms a resinous plaque that clogs the jellyplants. It is also recommended to remove the candles, drop some oil into the cylinders and swipe the starter several times to lubricate the internal surfaces.
Side storage
Two-stroke motors can be stored in any position, but it is best to keep them vertically or on a deidvile cushion so that oil does not flow out of the crankshaft glands.
Regularly check the condition of the screw. Burrs on the blades reduce efficiency and create vibration. If there are deep scratches, the screw is better replaced or given for restoration. Lubrication of the slate shaft and gearbox with special lubrication should be carried out at least once a season.
The final choice: should I take it?
China’s 9.8 hp outboards are now a great choice for owners of PVC boats ranging in length from 3.2 to 3.8 meters. They provide confident planing with two passengers and equipment, while remaining light enough to carry in the trunk of a passenger car, the cost of such units is 2-3 times lower than that of top Japanese or American brands.
The main thing is not to chase the lowest price and choose models of famous Chinese brands with good service support. With proper care and timely replacement of consumables, such a motor will last many seasons, giving joy from communicating with water. The power of 9.8 hp is the “golden mean” for unregistered boats, allowing speeds up to 30-35 km / h.
If you're willing to spend a little time servicing and monitoring the quality of the mix, the Chinese will be a loyal helper for fishing and cruising, and the technological gap with Western counterparts is narrowing every year, making it economically viable.
Which gasoline is best used for Chinese engines 9.8 hp?
Most manufacturers recommend the use of AI-92 or AI-95 gasoline. AI-92 is preferable for carburetor engines, since it is less prone to the formation of soot and has a higher octane number in terms of real working conditions.
Can these engines be used in seawater?
Yes, you can, but with a mandatory fresh water wash after each use, the aluminum alloys that make motors are susceptible to galvanic corrosion in a salty environment, and it is also recommended to use anode protection if it is provided by the design of a particular model.
Are Chinese engines noisier than Japanese engines?
In general, yes, the noise and vibration levels of Chinese counterparts can be 10 to 15 percent higher, which is due to the quality of the parts processing and the balancing of the crankshaft, but installing the motor on the right transom and using a quality mixture can significantly reduce discomfort.
Do I need to register the engine 9.8 hp in GIMS?
According to the current legislation of the Russian Federation, registration is subject to small vessels with an engine of more than 8 kW (about 10.8 hp). 9.8 hp (about 7.2 kW) does not formally require registration of the boat itself if its length is less than 3 meters, but the rules may change, so it is worth clarifying the current regulations.