The decision to buy a motor to the boat marks a transition to a qualitatively new level of water travel. Engine. It turns a conventional rowing boat into a full-fledged fast boat, expanding horizons and shortening travel time, but the market is full of offers, and it is easy for a beginner to get confused with technical specifications and marketing tricks.
Before making a purchase, you need to clearly define the objectives of operation. FishingHunting, family cruising, or water sports require very different propulsion systems, and a mistake in power or type of control can cost not only extra money, but also safety on the water.
In this article, we will discuss all the nuances that will help you make an informed decision. outboard Let’s talk about the nuances of buying used equipment and touch on the legal aspects of registration.
Definition of requirements: Power and type of boat
The first thing to start with is to look at your boat's passport, and it's always on the transom or in the documentation. maximum capacityExceeding this parameter is strictly prohibited, as it changes the driving performance and reduces safety.
However, chasing maximum power is not always advisable. For a small PVC boat 3 meters long, a 5-9.9 hp motor is quite enough. More powerful models, such as 15 or 20 hp, will require registration with GIMS and the availability of rights, which adds to the bureaucracy.
- 🚤 For boats up to 3.2 meters long, the optimal engines are 2.5-5 hp.
- ⚓ For boats 3.2-3.6 meters suitable engines 9.9-15 hp.
- 🌊 For keel boats from 3.8 meters and above, consider 20-30 hp and above.
If you plan to often pull the boat ashore alone, a heavy four-stroke engine can be a problem, and in such cases, many choose lighter two-stroke models or electric motors.
⚠️ Warning: Installing a motor above the manufacturer’s recommended boat will void the warranty on the PVC material or hull and may result in the vessel tipping over at full speed.
Two-stroke or four-stroke: the eternal argument
Choosing between 2T and 4T is probably the most common question when buying. Two-stroke engines (2T) run on a mixture of gasoline and oil, lighter, easier to build and cheaper to maintain, but require a fuel mix and produce more noise.
Four-stroke engines (4Ts) run on pure gasoline, have a separate butter crankcase. They're more economical, quieter and more environmentally friendly, but much heavier and more expensive. And 4Ts can't be transported on the side without draining the oil.
The myth of fuel consumption
It's been said that 2T engines eat twice as much fuel, and in practice, if you set the carburetor right, the difference in flow is about 20-30%, not 100%, and the 2T often wins in the planing dynamics.
For fishermen who drift all day at low speeds, the four-stroke will be ideal due to quiet operation and economy. For hunters or those who move quickly between points and drag the motor through the windstorm, the two-stroke may be more practical.
| Characterization | two-stroke (2T) | four-stroke (4T) |
|---|---|---|
| Weight. | Lighter (30-40%) | Harder. |
| Fuel. | Gasoline + butter | Clean gasoline. |
| Noise | High. | Low. |
| Price. | Affordable. | Higher. |
New or used: where to look for a profitable deal
The decision to buy a motor to a boat often comes down to budget. Official dealers We offer new units with full warranty, service and the possibility of Trade-in. This is the safest, but also the most expensive way.
The used-motor market is huge, and you can find great options from big brands like this. Yamaha, Tohatsu or Suzuki But the risk of being drowned or a motor with the inserts turned is very high.
- 🔍 Check the compression: it should be within 10-12 bar and not differ by more than 1 bar between cylinders.
- 🌡️ Pay attention to the thermostat: if it is removed or oxide, then the engine overheated.
- 🔩 Check out lower unit: The presence of chipped paint and dents indicates impacts on stones or soil.
⚠️ Warning: When buying a used motor, be sure to require a demonstration of its operation on water or at least on a barrel. Running "dry" even for a few seconds can kill a lower unit bearing.
Buying a used motor is justified only if you understand the technique or take the device from a trusted friend, otherwise the savings may come out sideways.
Chinese Brands vs World Classics
In recent years, the question of which engine to buy has transformed into a choice between a proven Japanese/American classic and a budget Chinese counterpart. Hidea, Parsun and Hdx They hold a significant share of the market.
Chinese engines are often copies of old, time-tested models. Yamaha or TohatsuSo that means that parts are easy to find, and the design is familiar to any craftsman, but the quality of the casting and assembly can float from batch to batch.
Global brands offer cutting-edge technologies such as electronic throttle control, fuel injection, and incredible reliability, but the cost of maintenance and parts can be many times higher. For rare once-a-year trips, overpaying for a top brand doesn't always make sense.
You also need to consider the availability of service centers in your area, and it's half the battle to buy an engine, and it's important that if you have a breakdown, you have a specialist who can work with that brand.
Legal aspects and registration in GIMS
Purchase of the engine entails legal consequences: according to the current rules, the registration in the GIMS is subject to boats weighing more than 200 kg (in running order) OR motors with a capacity of more than 8 kW (about 10.8 hp).
This creates an interesting situation: if you have a light boat and an engine up to 10 hp inclusive, you do not need to register the vessel, which is why 9.9 hp engines (which are often structurally 15-strong with a limiter) are in great demand.
Rule of registration:Boat weight > 200 kg OR Power > 8 kW (10.8 hp)
= Mandatory registration and category “M” rights
When buying, be sure to keep the contract of sale and technical passports, without documents you will not be able to register the boat, nor legally sell it in the future, and the absence of documents equates to the lack of ownership.
☑️ Documents for the purchase of the motor
Service and preparation for the season
Once you've managed to buy a motor for the boat, the development phase begins. The new engine requires mandatory breaking in. For two-stroke engines, it's usually 10 hours of work on an enriched mixture, for four-stroke engines, working at different turns without full load.
Regular maintenance prolongs the life of the engine, changing the oil in the gearbox every season, and in the crankcase (for 4T) every 50-100 hours. spark plug and clean fuel filters.
Storing the engine in the winter is a separate topic. If you're not canning the engine, the residue of water in the cooling system can freeze and rupture the cylinder block. Purging and storing in the vertical position is mandatory.
Always bring a spare candle and candle key to the water, and 80% of the time the engine stops suddenly because of a faulty candle, and it takes 2 minutes to replace.
Do I need to register a 9.9 hp engine?
Not if your boat weighs less than 200 kg. 9.9 hp is about 7.3 kW, which is less than the threshold of 8 kW. However, if the boat is heavy (for example, metal), you will have to register by weight.
Can I use AI-92 gasoline?
Yes, most modern outboard motors are designed for the AI-92. Using the AI-95 will not give you power gain, but it can be harmful to some types of rubber carburettor seals. Always read the instructions.
Which is better: electric motor or internal combustion engine?
The electric motor is ideal for quiet fishing, trolling and water bodies with no ICE, but it requires heavy batteries and charging. The ICE gives full autonomy and high speed, but it makes noise and requires fuel.