Choosing an outboard motor for a small inflatable boat or a light boat is always a trade-off between price, reliability and weight. In recent years, Chinese brands have firmly established themselves in the domestic market, offering affordable alternatives to the Japanese classics. SharmaxThe products of the company are of great interest to boaters looking for a budget solution for fishing or recreation.
Many potential buyers are wondering whether these units are able to compete with the time-tested. Tohatsu or YamahaIn this article, we will discuss in detail the design features, the real possibilities and hidden nuances of the operation of this manufacturer's equipment. sarmax And whether it's worth saving on the purchase.
It’s worth noting that the brand is positioning itself as a supplier of equipment for a wide range of tasks, from compact two-stroke PVC boats to more powerful four-stroke versions. Understanding the specifics of each type of engine will help you make sure you don’t make mistakes when choosing and avoid unpleasant surprises on the water.
Technology and design features of Sharmax engines
Most models are built on time-tested designs, and it is often said that these engines are copies of Japanese models, but this is not entirely true. Rather, it is a deep modernization of old but reliable circuits using modern materials and alloys. Aluminum alloys, used in the production of lower units and housings, undergo special anti-corrosion treatment, which is critical for operation in salt water.
The ignition system in modern models is often equipped with electronic control CDI Capacitor Discharge Ignition: This allows for more stable engine performance at different revs and makes it easier to start in cold weather. Unlike older contact systems, electronics require less maintenance, although they are more sensitive to fuel quality and moisture in the electrical circuit.
The manufacturer has paid special attention to the cooling system: a water pump located at the bottom of the lower unit provides fluid circulation through the engine shirt. A critically important element here is the impeller pump, made of heat-resistant rubber, which, when working for a long time on dry, is instantly deformed.Therefore, control of the water stream ("control") must be constant.
The Secret to Durability of lower unit
Inside the lower unit, there's a long shaft that transmits torque. At the bottom is a gearbox. To avoid rapid wear of gears, it's important to use only the recommended transmission oils and change them after the first 10 motor hours and then every season.
The carburetor design is also noteworthy: budget segments often use simple float carburetors that are easy to repair in the field, but they require periodic cleaning and adjustment, especially if the engine has been idle for a long time.
Two-stroke models: lightness and power
Two-stroke ruler Sharmax It's because of its simplicity, light weight and high power density. For lightweight inflatable boat owners, where every kilogram on the transom matters, a two-stroke is often the only sensible choice.
The way these engines work is to lubricate the rubbing parts with oil mixed with gasoline, which eliminates the need for an oil crankcase and a complex lubrication system, which makes the engine more compact, but there is also the downside: increased fuel consumption and the need to prepare the fuel mixture in the right proportion.
- 🚀 High specific powerTwo-stroke engines produce more horsepower per unit volume, which provides excellent acceleration.
- ⚖️ Minimum weightThe absence of heavy components makes transportation and installation on the boat as convenient as possible.
- 🔧 Ease of maintenance: The design contains fewer moving parts, making it easier to diagnose and repair.
When operating, it is important to strictly observe the ratio of mixing gasoline and oil. Usually the manufacturer recommends a ratio of 1:25 for the break-in period and 1:50 for continuous use. Using poor-quality oil can lead to the formation of soak on candles and piston rings, which will reduce compression.
Four-stroke modifications: economy and silence
For those who value comfort and are willing to put up with extra weight, the brand offers four-stroke versions, which operate on a full cycle, where the exhaust and fresh mixture intake processes are separated, which ensures cleaner exhaust, low noise levels and significantly lower fuel consumption.
In a four-stroke engine. Sharmax The oil is in a separate crankcase, and it doesn't burn with the fuel, which means you don't have to mix anything, you fill it up and you drive, but it requires regular checks of the oil levels and timely replacement, just like a car engine.
The weight of four-stroke units can be 30-40% higher than that of two-stroke analogues of the same power, due to the more complex gas distribution mechanism (valves, camshaft) and oil crankcase, so when choosing a motor for a light PVC boat, you need to consider the carrying capacity of the craft.
With a long parking (more than a month), it is better to store the four-stroke engine in an upright position so that oil does not flow into the combustion chamber through the piston rings.
Technical specifications of popular models
To make it easier for you to navigate the model range, we have prepared a comparative table of basic specifications, the data may vary slightly depending on the year of release and the specific modification, but give an overview of the capabilities of the technology.
| Model | Type of engine | Power (hp) | Weight (kg) | Recommended oil |
|---|---|---|---|---|
| SM 2.5 | two-stroke | 2.5 | 9.5 | Mixture (1:25) |
| SM 5.0 B | two-stroke | 5.0 | 19.0 | Mixture (1:50) |
| SM 9.8 B | two-stroke | 9.8 | 26.0 | Mixture (1:50) |
| SM 5.0 F | four-stroke | 5.0 | 24.5 | SAE 10W-30 |
As you can see from the table, the range of specifications allows you to choose a unit for both a small Kazanka and a more serious inflatable boat. When choosing, pay attention to the height of the lower unit, as it should correspond to the height of the transom of your boat.
Don't chase for maximum power unless your boat is designed for speed modes. Overloading the transom can lead to impaired performance and even tipping the boat. Security Always be the number one priority.
Rules of running: first start and first hours
Running a new engine is the most important step in determining its lifespan, and many beginners neglect this process by starting the engine immediately at full power, which is a gross mistake. Engine parts such as piston rings and bearings must be worn together.
The breaking in process Sharmax It usually takes about 10 hours, during which time it is not recommended to open the throttle more than 50-70%, the engine should operate at different speeds, avoiding long idling or, conversely, at maximum.
☑️ Checklist of proper breaking in
⚠️ Attention: Never run dry outside the water, and the lack of water cooling will cause the piston to overheat and jam in the cylinder in minutes, which is not a guarantee.
After the first 10 hours of operation, maintenance is required, which includes checking the tightening of all bolt joints, cleaning the spark plug from the soak and replacing the oil in the gearbox (if it is a four-stroke or after running the two-stroke, if required by the instructions).
Typical malfunctions and methods of their elimination
Like any other technique, motors Sharmax They can be a problem, especially if you're not operating properly, and most often, problems are caused by poor fuel or old oil, and let's look at the main symptoms and how to address them.
If the engine starts badly or dies at idle speed, the first thing to do is check the fuel supply system. Carburetor jetty or fuel filter is often clogged. It's also worth checking the condition of the candle: if it's black and wet, it means the mixture is too rich, or there are problems with ignition.
- 🔥 OverheatingIf the control stream is weak or absent, immediately turn off the engine. Check the water intake for debris (algae, sand).
- 🔊 Extraneous noise: knocking or vibration may indicate a bearing problem or a foreign object hitting the screw.
- 💨 Smoke exhaustBlue smoke indicates oil burning, white smoke indicates water entering cylinders, which is extremely dangerous.
⚠️ Attention: If there is a knock at the bottom of the lower unit (in the gearbox area), the operation must be stopped, which may indicate the destruction of gears or bearings, and further work will lead to a complete jamming of the shaft.
For self-diagnosis, it is useful to have a basic set of tools: a candle key, a set of screwdrivers and a compressometer. The ability to read the color of a spark plug gives you a lot of information about the state of the engine.
90 percent of the problems with starting and operating insecure Sharmax engines are related to the quality of the fuel mixture and the condition of the spark plug.
Storage and Winter Conservation Tips
Proper storage in the off-season prolongs the life of the engine for years. Leave gasoline in the carburetor for the winter is absolutely impossible: light fractions evaporate, and tar precipitation clogs the thin channels of jelly. Before storage, exhaust all fuel from the float chamber.
If you have a four-stroke model, make sure to replace the engine oil. The waste oil contains combustion products and acid compounds that can damage the internal surfaces of the engine during the winter.
It is best to store the unit upright in a dry room, and if this is not possible and the engine remains on the boat, make sure that it is securely closed from precipitation and direct sunlight, which destroys rubber seals and plastic.
Remember to lubricate the pivot hinges and the rumule with a consistent lubricant, which will protect them from corrosion and ensure easy control next season, and regular maintenance is the key to starting the engine the first time next spring.
Which octane of gasoline is best used for Sharmax?
Most current models recommend AI-92 or AI-95 gasoline, and using fuel with a lower octane number can cause detonation, and higher fuels can not give a gain in power, but can lead to overheating due to longer combustion, the main thing is the freshness of the fuel.
Can I use the Sharmax motor in salt water?
Yes, but you need more care, and after every trip to the sea, you need to flush the cooling system with fresh water, and corrosion in the salty environment develops much faster, so regular lubrication and washing are mandatory.
Where to find spare parts for Sharmax outboard motors?
Since the design of the engines is often unified with other Chinese brands and old models of Japanese manufacturers, it is quite easy to find consumables (candles, glands, gaskets) in specialized water motor equipment stores.
Why does the engine smoke when it's working?
For two-stroke engines, smoke is normal, especially when running or running on a rich mixture. However, if the smoke becomes black and caustic, check the proportion of oil in the gasoline and the condition of the air filter.