How to buy a rubber outboard motor: a complete guide

Planning to buy a power plant for a boat is always a balance between the speed, budget and physical capabilities of the owner. buy a rubber outboard motorYou have a lot of technical nuances that can be confusing for a newcomer, and the market is saturated with offerings from Chinese brands to eminent Japanese and American manufacturers, and it is extremely difficult to make the right choice without preparation.

The wrong power or engine type can turn a nice walk into a test of strength, and in the worst case, damage the boat itself, which is why it's important to decide in advance whether it's a lightweight pleasure boat or a serious machine for trolling and going out into the big water, and these factors affect not only the cost, but also the comfort of your operation in the future.

In this article, we will take a look at all aspects of the choice, from the type of tactile engine to the features of the transom of your boat, and we will help you avoid common mistakes and choose a unit that will last for many years.

Key criteria for choosing a power unit

The first thing to decide on is engineThe main division is based on the principle of operation: two-stroke and four-stroke models. Two-stroke models are traditionally lighter, cheaper to buy and easier to maintain, making them ideal for small inflatable boats. However, they require a mixture of gasoline and oil and work more noisy.

Four-strokes, by contrast, are quieter, fuel efficient, and don't require mixing oil with gasoline, but you'll have to pay for these benefits with more weight and a higher initial cost. If you plan to go out often and appreciate comfort, a four-stroke might be the best solution, despite its size.

⚠️ Warning: Before you buy a motor, be sure to check the maximum allowable power specified in your boat's passport. Exceeding this parameter can lead to the destruction of the transom and loss of warranty.

A critically important parameter is lower unitInflatable boats typically use a short lower unit (designated as S), which is about 381 mm (15 inches). Installing a long shaft on a shallow-seated boat will result in increased water resistance and loss of speed, as well as create a risk of damage to the propeller.

Calculation of the required power for PVC

The power of the engine directly affects the speed of exit to planing and the maximum speed of the vessel. For light single or double boats up to 3 meters long, often enough power in 2-5 hp Such models allow you to safely navigate around the pond, bypass obstacles and fish in quiet weather.

If you want to be able to get into the plane with two passengers and cargo, consider models ranging from 9.8 hp and up, and consider not only the length of the boat, but also its load capacity. heavy boat With a weak engine, it will simply "dig" water, wasting fuel, but not developing speed.

There is a simple formula for an approximate calculation: for every 25-30 kg of total weight (boat + motor + people + cargo), 1 horsepower is required. However, this is a very averaged data, and the real figures depend on the shape of the bottom and the quality of the inflatable tubes.

For those planning to use a boat for trolling or in areas with noise restrictions, electric motors will be an excellent option. Their power is measured in thrust (pounds), where 1 pound of thrust is approximately 0.45 kg. For a PVC boat 3 meters long, 30-40 pounds is usually enough thrust.

Overview of popular manufacturers and brands

The outboard motor market can be divided into several segments, the premium segment is represented by brands. Yamaha, Tohatsu and HondaThese companies offer benchmark reliability, excellent corrosion resistance and high liquidity in the secondary market, and if you want to buy a motor that will start even after a long downtime, it's worth looking at them.

The average price segment is occupied by brands such as Suzuki and MercuryThey offer great value for money, often using time-tested designs, which are popular with fishermen and tourists who want reliability, but have limited budgets.

The budget segment is heavily occupied by Chinese manufacturers, such as Hidea, Parsun and HdvMany of these plants are Japanese-licensed engines or full copies of proven models, and in recent years, their build and materials have improved significantly, making them attractive to newcomers.

Brand	Country.	Price segment	Features
Tohatsu	Japan	Highly	Leader in the production of two-strokes, reliability
Yamaha	Japan	Highly	Advanced technology, high price of spare parts
Hidea	China	Medium/Low	Yamaha copies, available spare parts
Parsun	China	Budgetary	Low price, simplicity of construction

The Secrets of Chinese Motors

Many Chinese engines are assembled from Japanese components in factories in China, which allows for a price reduction of 30-40% without critical loss of quality, but quality control on the conveyor can differ from batch to batch.

Two-stroke or four-stroke: the eternal dilemma

Choosing between a two-stroke and a four-stroke is not just a matter of price, it's a matter of philosophy of boat use. Two-stroke engines have a cycle of operation where each crankshaft turns combustion, which gives them an advantage in power density per kilogram of weight. For a inflatable boat where every kilogram of weight matters, it often becomes a deciding factor.

Two-stroke engines can be transported in any position, which is extremely convenient for owners of small cars. Four-stroke analogs require a strictly vertical position during transportation and storage, since the oil is in the crankcase and can leak into the cylinder or muffler.

Four-stroke engines They're good at sustainability and efficiency, they use 20 to 30 percent less fuel, and they don't require a can of oil at hand, and if you're planning long walks or fishing trips where silence matters, a four-stroke is the best option.

⚠️ Warning: Do not try to start a four-stroke motor on the side or upside down, even for a short time, guaranteed to lead to oil starvation and piston group bullies.

It's also worth mentioning the resource: Four-stroke engines are more complex, but when oil is changed in a timely manner, they take longer to go until the first overhaul. Two-strokes are easier to repair, but their piston group wears out faster because of the lubrication features.

Where to buy a motor and what to look for

Buying a outboard motor is a serious investment, so the location is key: Official dealers offer a warranty, pre-sales preparation (break-in) and a service book, which is especially important for complex four-stroke models, where improper initial break-in can kill the engine.

When buying from online stores or markets (Avito, Yula), you need to conduct a thorough visual and technical diagnostics. Check lower unit for deep scratches and dents - these are traces of impacts on stones or the bottom that could damage the shaft or gearbox. The presence of chips on the drain plug of the gearbox is a disturbing sign that the gears are breaking.

Be sure to check availability documentMotors over 5 hp (and under the new GIMS rules up to 10 hp inclusive if the boat weighs up to 200 kg) require registration and rights. Without a check and a PSM (passport of a self-propelled car), you will not be able to legally register the equipment.

Also, pay attention to the equipment. Often the engine is sold without a screw, tank or remote hummingle, specify what is included in the price to avoid unpleasant surprises when receiving the goods.

Maintenance and preparation for the first launch

Once you have bought the engine, the most important step is to run it right. For two-stroke engines, it is to run on an enriched mixture (more oil) for several hours, and it is usually recommended to develop 2-3 fuel tanks in modes up to 70% of maximum power.

Four-stroke engines require oil change after the first 5-10 hours of operation, during which time the parts are laundered, and metal shavings accumulate in the oil, and ignoring this procedure will reduce the engine life by many times.

The ratio of the mixture for two-stroke engine (standard 1:50):
1 liter of gasoline + 20 ml of oil
5 liters of gasoline + 100 ml of oil
20 liters of gasoline + 400 ml of oil

Don't forget to conserve for the winter, if the engine isn't going to be used for more than a month, you either have to make all the gasoline out of the carburetor or you add a fuel stabilizer, and the gasoline left in the float chamber evaporates, leaving a resinous plaque that clogs the jelly.

Frequently Asked Questions (FAQ)

Do I need to register a rubber outboard motor in GIMS?

Registration is required for outboard motors over 8 kW (approximately 10.88 hp). It is also important to consider the total weight of the boat and engine. If the boat weighs less than 200 kg and the engine is less than 10 hp, registration is often not required, but the rules may change, so it is worth checking the current regulations at the local GIMS office.

Which petrol is better to use: 92nd or 95th?

Most modern two-stroke and four-stroke engines are designed for AI-92 gasoline. Using 95th gasoline with an increased octane number in engines that are not adapted for it can lead to overheating and burnout of pistons, since the 95th often contains additives that burn at higher temperatures.

Can I keep a boat with an engine installed?

Keeping a PVC boat with the engine installed is possible only in a deflated state or provided that the engine is removed. In an inflated state, the constant load on the transom from the weight of the engine (especially in warmth when the pressure in the cylinders increases) will lead to deformation of the transmutation board and loss of tightness.

How often should you change the oil in the gearbox?

The oil in the gearbox (lower gear) is recommended to change once a season or every 100 motor hours. When replacing, pay attention to the color of the oil: if it is "coffee with milk", then the water through the glands has got into the gearbox, and urgent repairs are required.

What if the engine doesn’t start after winter?

Most often, the problem is old fuel or candles. Turn the candle, check the spark. If there's a spark, but the engine catches and dies, probably the carburetor's jellies are clogged with resins from old gasoline. You need to clean the carburetor and replace the fuel filter.