Buying the first or the next boat is always accompanied by the question of the power plant, because it depends on it comfort, speed and safety on the water. It is easy for a beginner in the water-motor theme to be confused by looking at the endless rows of engines in store catalogs where prices and specifications vary significantly. The choice between a gasoline unit and electric traction, two-stroke or four-stroke construction is often a decisive factor in budget and pleasure from operation.
Determine, What kind of outboard motor to buy It's for your purposes, you can only analyze the specific operating conditions: whether it's a quiet fishing at dawn, a high-speed walk on the surface of the reservoir or a serious water tourism with full load. A mistake at this stage can lead to the fact that the equipment will either suffocate in shallow water or will not be able to bring the heavy body to sleeve. In this article, we will discuss the key aspects of the choice, so that your purchase is the beginning of a long and happy friendship with water.
Gasoline or electricity: choice of energy source
The first and perhaps most fundamental division in the world of boating technology is the type of energy used. Gasoline engines (ICEs) have traditionally dominated the market for their high autonomy and long distances without recharging, ideal for large areas where refueling or sockets can be tens of kilometers away, and allow for high speeds, sleeve boats even with full load.
On the other hand, electric motors They're experiencing a real renaissance, especially in the small fleet and fishing boats, and their main trump cards are absolute silence, no exhaust gases and vibrations, and ease of maintenance. Electric tractor It allows you to sneak up on fish invisibly and maneuver in the thickets of reeds without scaring the inhabitants of the reservoir. However, it is worth remembering that the range here depends on the battery capacity, and recharge is possible only from a fixed network.
- 🔋 Autonomy: The gasoline allows you to go for several days, the electric motor requires planning the route taking into account the charge.
- 🔇 Noise and vibrations: electric motors work almost silently, the internal combustion engines emit a characteristic hum and vibration of the body.
- ⚖️ Weight: electric motors are much lighter than gasoline analogues of the same power, which is critical for inflatable boats.
⚠️ Attention: When choosing an electric motor, be sure to consider the weight of the batteries. Heavy traction batteries may be required to ensure a long run, which will shift the center of gravity of the boat and require a reinforced transom.
If you plan to walk on large rivers with strong currents or go to the coastal zone of the sea, where the reserve of power in case of a storm is important, gasoline remains the leader. For quiet fishing on lakes, slow-flowing rivers and in the no-motor zones (where only electric traction is allowed), electric option will be optimal.
Two-stroke or four-stroke: the eternal dilemma
In the segment of gasoline engines, the choice is between two-stroke (2T) and four-stroke (4T) engines. Two-tacters They are structurally simpler, lighter, and generally cheaper to buy, and they use a mixture of gasoline and oil to burn, which provides a high power specificity per kilogram of weight, making them ideal for small to medium-sized inflatable boats, where every extra kilogram on a transom matters.
Four-stroke engines They're car engines, and they're in the crankcase, and they don't burn, and they're more stable at low speeds, they're less fuel efficient, they're much less noise efficient, and they're also more environmentally friendly, because they don't throw out unburned oil in the water and the air, which is critical in places where there's a lot of environmental regulations.
But four-strokes have their own features that you can't forget: they're heavier than two-strokes of the same power, which may require a rethink of the boat's load capacity, and they're more complex, and maintenance requires a more skilled approach and regular engine oil replacement.
The myth of fuel consumption
It is widely believed that two-stroke engines eat twice as much fuel. In reality, modern two-strokes with E-TEC or MPI systems consume only 20-30% more four-strokes, while winning in the dynamics of acceleration.
For fishing, where low speeds are often required (trolling mode), the four-stroke engine is preferred, it does not stall at low speeds and allows you to swim at a minimum speed, which is impossible for many two-strokes without special improvements.
☑️ Criteria for engine type selection
Power calculation: table of conformity and reality
The question of which outboard motor to buy is a technical limitation of your boat: every boat, whether it is PVC or aluminum, has a sign indicating the maximum allowable power, and it is strictly forbidden to exceed this limit, as it threatens to destroy the transom and tip the boat at full speed.
But it's not always wise to put a minimum power engine, because it needs to be able to go smoothly, especially when it's fully loaded (fishers, gear, fuel, anchors), and if the boat can't get to the plane for a long time, it uses up a disproportionate amount of fuel and puts the engine under loads that it's not designed to handle.
| Boat type/Long length | Recommended power (hp) | Maximum speed (km/h) | Optimal type of motor |
|---|---|---|---|
| Inflatable (up to 3.2 m) | 2 - 5 hp. | 15 - 25 | 2T or Electro |
| Inflatable (3.3 - 3.6 m) | 5 - 9.9bhp. | 30 - 40 | 2T/4T (9.9bhp) |
| Boat / Boat (4.0 - 4.5 m) | 15-30 hp. | 45 - 60 | 4T (20-25bhp) |
| Boat (over 5.0 m) | 40 - 60+ hp | 60+ | 4T (30-50bhp) |
And you have to keep in mind that passport speeds are often given for ideal conditions: one person in a boat, calm and light fuel. In reality, with two passengers and a cargo, the speed will drop by 10 to 15 percent. Purchase of a motor with a margin of 20-30% of the minimum required power It is often more cost-effective in the long run than operating the engine to the limit.
For heavy flat-bottomed aluminum boats (Kazanki, fireworks), the power requirements are even higher, because their hydrodynamics are worse than those of keel boats. Here you can not save on horsepower - the boat simply will not get on plane mode, but will "dig" water, using fuel buckets.
Brand reliability and cost of ownership
The outboard motor market today is divided into several segments, with leaders from Japanese and American brands such as Yamaha, Tohatsu, Honda, Suzuki and MercuryThese companies' products are highly reliable, service-oriented and market-based, but they are also expensive.
The second tier is motors assembled in China under licenses or control of foreign companies (e.g., motors manufactured in China). Yamaha It assembles some models in China, HDW The third segment is entirely Chinese brands (for Mercury).Hidea, Parsun, HDX) Over the past 5-7 years, the quality of Chinese engines has grown tremendously, they are no longer "disposable" and now often offer the same technologies as top brands, but at 60-70% price.
When choosing a Chinese, it's important to understand the risks, and the main one is the build lottery, one motor can run for 10 years without problems, the second engine can burst the crankcase on the break-in, but the parts for popular Chinese engines are available and cheap, while waiting for a piston group for the first time. Tohatsu It could take months.
- 💰 Price: Chinese engines are cheaper to buy, but may require more attention when running.
- 🔧 Repairability: On popular models (9.9, 15, 20 hp) spare parts are everywhere, on rare - there may be problems.
- 📉 Liquidity: Japanese brands are slower to lose value on resale.
⚠️ Attention: When buying a budget engine, be sure to immediately replace all technical fluids (oil in the gearbox, transmission oil) with quality analogues. Factory lubrication is often of low quality and is only used for transportation.
Transportation and storage of equipment
Often, when you ask yourself, "What kind of outboard motor to buy," you forget about logistics. A 40-50-kg motor (along with a lower unit) is not easy to drag along the shore, load into the car and lift on the transom alone, and if you don't have a winch or an assistant, weight becomes a critical parameter.
Two-stroke motors can be transported in almost any position, although it is better to hold them vertically or on a certain side (as indicated in the instructions). Four-stroke motors require strictly vertical storage and transportation, since oil from the crankcase can leak into the cylinders and cause a hydraulic shock at start, this imposes restrictions on the choice of car and the method of attachment.
There are also nuances to storage: gasoline engines require conservation for the winter: fuel discharge, candle treatment, lubrication of knots. Electric motors require proper storage of batteries (not in the cold, with periodic recharging), ignoring these rules will lead to the fact that in the spring you will get a idle unit.
If you live in an apartment and plan to bring the engine into the elevator, measure its dimensions. lower unit longer than 1 meter may not fit into a standard cabin diagonally. In such cases, it sometimes makes sense to consider models with a shortened lower unit or removable leg, although this is rare in the budget segment.
Running in: the way to a long life of the engine
Once you've decided on the model and bought the engine, the most important step is the break-in, which is the process of working out the rubbing parts of the engine. For two-stroke engines, the break-in is done on a mixture of gasoline and oil (usually in a ratio of 1:25 or 1:50, depending on the instructions) during the first 10 hours of operation, and it's important not to give full gas during this period.
Four-stroke engines run on pure gasoline, but also with a speed limit (usually no more than 50-60% of the maximum) in the first 10 hours, during which time the piston rings and bearings are laundered, neglect of the break-in mode can lead to bullies in the cylinder and loss of compression in the future.
Should I change the oil after the first break-in?
For four-stroke engines, it is mandatory. After the first 10-20 hours, the oil is saturated with metal shavings from grinding parts. Replacing it will significantly prolong the engine life. For two-stroke engines, you do not need to change the oil (it burns), but it is recommended to check the tightening of the mount bolts.
Can I use oil for two-stroke motors from chainsaws?
Not at all. Oils for water technology are TC-W3 labeled and special additives that prevent corrosion and ensure proper combustion in water. Chainsaw oil (JASO FD/FE) is designed for air cooling and will lead to the coking of candles and pistons of the outboard motor.
What kind of gasoline to pour into the outboard motor?
Use only fresh gasoline with the octane number recommended by the manufacturer (usually AI-92 or AI-95). Do not store gasoline in the engine tank for longer than a month, as it oxidizes and loses its properties. For two-stroke engines, mix the fuel immediately before use or use stabilizers if you plan to store the mixture.
Properly conducted running and use of high-quality fuels increase the life of the outboard motor by 1.5-2 times, making the initial savings on oil meaningless.
In conclusion, choosing an outboard motor is always a trade-off between what you want and what you can do, not to chase the maximum power if the boat is small, or to save on reliability if you walk far from shore, weigh the pros and cons, study the feedback of real owners, and remember that the best motor is the one that works well and brings joy from communicating with water.