Choosing a first or an additional engine for a boat is often a challenge because of the sheer number of offers on the market, and the 9.8 horsepower is a kind of middle ground for smoothly planing on small craft while remaining within the framework of legislation that does not require rights to operate a small vessel. rating of outboard motors up to 10 hp It is in high demand among fishermen and lovers of cruising.
Even in this segment, modern models are equipped with electronic injection systems, improved cooling systems and reduced noise. However, despite technological progress, reliability and ease of maintenance remain the main criteria for choosing. In this article, we will discuss in detail the market leaders, their technical features and help you decide on a purchase that will last for many years.
Criteria for selecting a motor for small boats
When choosing a power unit for a light inflatable or aluminum boat, you need to consider not only the declared power, but the most important parameter is the weight of the device, since for small craft, each extra kilogram affects the stability and speed of getting on plane. Two-stroke The engines are traditionally lighter than their four-stroke counterparts, which makes them favorites in the class up to 10 hp, but four-strokes win in economy and environmental friendliness.
The second key factor is the type of control and the length of the daydwoot. PVC inflatable boats are most often suitable for the short leg (S), while keel aluminum boats may require a standard length (L). electronic ignition, which provides a stable start in any weather and smooth operation at idle speeds.
⚠️ Warning: When choosing a motor, be sure to check the maximum recommended power specified by the manufacturer of the boat on the transom. Exceeding this parameter can lead to the destruction of the boat's structure and dangerous situations on the water.
And don't ignore the availability of service in your area. Tohatsu or SuzukiThey have a well-developed network of dealers, which makes it easier to find parts, and less common brands can be problematic in the event of a breakage in the high season.
Market leaders review: Tohatsu and Suzuki
Japanese manufacturers have been setting the standards for small capacity for decades, and the leader in sales has traditionally been considered to be the leader in the industry. Tohatsu M9.8BIt's a car that's rightfully ranked number one in many of the world's rankings, and it's famous for its incredible survivability, aluminum carburetor, and all kinds of climates.
The second permanent leader is Suzuki DF9.9Often chosen for its thrust and sophisticated cooling system, Suzuki relies on microcomputer ignition control to optimize fuel combustion and reduce costs, and both brands offer excellent maintenance and high residual life.
Among the advantages of the Japanese build users often distinguish:
- 🛡️ High corrosion resistance of materials and coatings.
- ⚙️ Simple and understandable design, available for self-service.
- 🔇 Low vibration level even at maximum speed.
Tohatsu and Suzuki are the benchmark of reliability in the up to 10 hp class, where simplicity of design directly affects the durability of the unit.
Budget alternatives: Chinese brands and their features
In recent years, Chinese manufacturers have been Hidea, Parsun and HDXThey've made a lot of improvements in their products, and often these engines are assembled on license lines using old Yamaha or Tohatsu designs, and this allows them to get a working unit at a much lower price than their Japanese or European counterparts.
The main advantage of these engines is the affordable cost and rich equipment. For the same money you can get a model with an electric starter or generator, which will cost much more from top brands, but when buying a budget option, you need to be prepared for more thorough initial break-in and possible replacement of some consumables, such as candles or fuel hoses.
⚠️ Warning: When buying a Chinese engine, be sure to make a defect before first operating, check the tightening of all bolt connections and the quality of the build of the datawoot, as control in factories may be less stringent.
Despite the stereotypes, many models, for example, Hidea HD9.8They're very good at planing boats up to 3.5 meters long and they're good for quiet fishing, and the key is to keep the oil change routine and not overheat the engine.
Comparative table of technical specifications
To make it easier to choose, we have developed a composite table comparing key parameters of popular models, which is relevant for standard manual and tiller-controlled modifications.
| Model | Type of engine | Weight (kg) | Workload (cm3) | Features |
|---|---|---|---|---|
| Tohatsu M9.8B | two-stroke | 27.0 | 169 | aluminum carburetor |
| Suzuki DF9.9 | four-stroke | 37.0 | 284 | Microcomputer management |
| Mercury 9.9M | two-stroke | 27.5 | 169 | Based on Tohatsu |
| Hidea HD9.8 | two-stroke | 26.0 | 169 | Budget segment |
The table shows that two-stroke They're almost 10 kilograms better off than the four-strokes, which is a critical parameter for inflatable boats, where the center of gravity is as low as possible, and four-strokes, in turn, offer more torque at low revs.
Why is 9.8 HP more popular than 10 HP?
Many manufacturers artificially lower the power from 10 to 9.8 horsepower. This is done to ensure that the engine formally falls into the category of up to 10 hp, which allows owners not to register a boat in the GIMS and not to pass the examinations for rights if the total power of all engines on the boat does not exceed 10 hp.
Two-stroke or four-stroke: which one to choose?
The perpetual dispute between the two-bar and four-bar segments of the 10 hp segment has its own peculiarities: two-stroke engines are structurally simpler: they do not have a crankcase lubrication system, oil is mixed with gasoline, which makes them lighter, cheaper to repair and less sensitive to transport on the side.
Four-stroke motors, such as Suzuki DF9.9They have a separate lubrication system, which eliminates the need to constantly cook the fuel mixture. They work quieter, use less fuel and emit less harmful substances. However, their weight and dimensions often become a limiting factor for small boats.
If you plan to use a boat for trolling at low speeds for a long time, a four-stroke motor will be preferred due to the stability of low speed operation and the lack of risk of candles coking.
The choice also depends on the frequency of use. For rare weekend trips, a two-stroke can be more practical, as it is easier to store in the winter.
Features of operation and maintenance
Any outboard motor, regardless of brand, requires proper maintenance. The first and most important step is running in. During this period, parts are laundered, and a malfunction can permanently damage the engine. Usually, the break-in is 10 hours, of which the first hours must be at a revs of no more than 50% of the maximum.
☑️ Checklist before first launch
Regular maintenance includes replacing spark plugs, checking fuel filters and lubricating friction units, and special attention should be paid to the cooling system: after each recoil of the engine from the water, you should let it work for a few seconds in the air to drive out the remaining water, or blow out the system.
⚠️ Warning: Never store a full tank of gasoline indoors. Fuel vapors can accumulate, creating an explosive mixture. Before long-term storage (in winter), it is recommended to generate fuel from the carburetor.
Legislative nuances and registration
Under current legislation, a boat with an engine up to 10 hp (inclusive) is not subject to registration with the GIMS if the total weight of the equipped vessel does not exceed 200 kg. This makes 9.8 hp engines extremely popular, as they allow you to legally avoid bureaucratic procedures.
But remember, the power is in the manufacturer's file, and if you buy a 9.8 hp engine that's 10 hp structurally, you're technically following the law, but if you take the limiter off yourself, you're going to break the rules.
Buying a motor up to 10 hp is not only saving on the purchase, but also the absence of an annual tax and the need to undergo a technical examination in the GIMS.
Frequently Asked Questions (FAQ)
Can I refuel 92nd gasoline in a outboard motor?
Most modern two-stroke engines, such as Tohatsu and Suzuki, are designed to use AI-92 gasoline. Using AI-95 does not provide benefits and may even harm due to various additives. Always check the instructions of the specific manufacturer.
What is the ratio of oil and gasoline optimal for running?
For two-stroke engines, the standard ratio is 1:50 (2% oil) for modern synthetic oils. During break-in, some experts recommend slightly increasing the oil fraction to 1:40 to ensure better lubrication of rubbing vapors, but this depends on the type of oil used.
Why does the engine stop at idle speed?
The most common cause is contamination of the carburetor or fuel filter, and the problem may lie in the wrong screw quality mixture or use of old gasoline, lost its properties during storage.
Do I need to grease lower unit before storage?
After the season, you need to lubricate all visible metal parts of Daydwoot with conservation lubricant to prevent corrosion from moisture and salt residues, and pay special attention to the places where the paint chips are.