The search for a reliable and affordable outboard motor for a small PVC boat or aluminum “Kazanka” often leads anglers and water-engineers to a time-tested model. Hey, 25.This two-stroke unit, developed in the Soviet years, remains in service due to its simplicity, maintainability and availability of parts. Despite the emergence of many modern analogues, this engine is often chosen by those who value functionality and self-service.
The 25 horsepower is a kind of middle ground for small boats ranging in length from 3 to 4.5 meters, and allows you to confidently slid the boat into sleeve even with full load, including crew, equipment and fuel. However, like any technology, this engine requires a competent approach to running and regular maintenance for long service.
In this article, we will discuss in detail the design features Hey, 25.We'll talk about its actual fuel consumption, its typical faults and how to fix them. carburetor To achieve maximum efficiency and which oils are best used for the mixture, this guide will help you make the most of your engine’s life.
Technical specifications and design features
Engine. Hey, 25. It is a classic two-stroke gasoline engine with vertical cylinders, devoid of complex electronics, making it resistant to operating conditions far from civilization, and the power unit is based on a single-cylinder block with deflector purging, which provides good traction at low and medium speeds.
The cooling system is forced, off-shore water. The water pump is located in lower unit and is driven by a crankshaft. tightness The cooling system is directly dependent on the condition of the glands and gaskets, which may require replacement over time. The case of the daydvut is made of aluminum alloy, which reduces the overall weight of the engine, but requires caution when hitting underwater obstacles.
The engine's transmission includes a clutch and a reverse gearbox that allows you to switch between front, neutral and rear, controlled by a tiller or remote-pilot-gas, which is convenient for different types of boats. The engine weight in running order is about 36-38 kg, making it possible to transport it by one person, although it requires physical training.
⚠️ Warning: When operating the motor, always check for a jet of water from the control hole ("control"). The absence of a jet indicates a malfunction of the pump or clogging of the system, which can lead to overheating and jamming of the piston in a matter of minutes.
Below is a table with the main technical parameters that will help you compare the capabilities of the motor with your boat:
| Parameter | Meaning |
|---|---|
| Power, HP. | 25 |
| Working capacity, cm3 | 346 |
| Maximum speed, rpm | 4500-5000 |
| Ignition system | Magdino (contact/contactless) |
| Fuel. | AI-92 petrol + oil (1:25 - 1:50) |
The ignition system deserves special attention. Older versions used contact magneto, which required regular cleaning and adjustment of the gap. electronically-ignitionThis greatly simplifies the start and stabilizes the engine in any modes.
If you upgrade an old engine, an electronic ignition installation (for example, from Mikhalych or analogues) solves 90% of problems with unstable operation and candles.
Fuel consumption and preparation of fuel mixture
Economy is one of the key factors when choosing an outboard motor. Hey, 25. The fuel consumption is proportional to the load on the propeller and engine speeds. On average, when driving at cruising speed (about 3500-4000 rpm), the flow rate is from 8 to 12 liters per hour. At maximum speeds, this figure can reach 14-15 liters, which should be considered when planning long routes.
The quality of the fuel mixture plays a critical role in the life of the engine. Since in two-stroke engines, oil burns with gasoline, lubricating the cylinder-piston group, the proportions should be treated strictly. For running a new or repaired engine, a mixture of 1:25 is recommended (40 ml of oil per 1 liter of gasoline).
- 🛢️ Use only special oils for two-stroke engines with markings
TC-W3intended for water cooling. - ⛽ Gasoline should be fresh; it is not recommended to store the fuel mixture for more than 2-3 weeks, as it loses its properties and delaminates.
- 🧪 Stir the components thoroughly in a separate can before pouring into the tank, rather than directly in the engine tank.
The wrong oil-gasoline ratio can have serious consequences: excess oil will cause candles to coking, piston soaking and smoke. Lack of oil is guaranteed to lead to bullying in the cylinder and major repairs. So always use a measuring syringe or a risk tank for accurate dosing.
Setup of the carburetor and fuel supply system
The carburetor is the heart of the fuel system, and the right setting determines the idle speed and the idle stability. Hey, 25. Float carburetors are often installed, and the main task of adjustment is to achieve smooth engine operation at idle speeds and no "failures" when the throttle is sharply opened.
Adjustment is usually done by two screws: a mixture quality screw and a mixture quantity screw. Start setting on the warm engine. First, the number screw sets the minimum steady speeds, then the quality screw finds the position at which the speed is maximum, and again adjust the number. The process may require several repetitions to achieve the ideal.
⚠️ Attention: A poor mixture (lots of air, not enough gasoline) is more dangerous than a rich one, causes the engine to overheat and can cause the piston to burn out. If the engine dies after adjustment under sharp gas, the mixture is likely too poor.
It's also important to keep track of the fuel filters, the rough sludge filter and the net in the float chamber must be clean, the clogged filters create a "fuel starvation" effect at high speeds, when the engine suddenly loses power or dies under load. purging Compressed air fuel systems help to avoid such situations.
Symptoms of improper setting
If the candles are black and wet, the mixture is rich; if the candles are white or brown, but the engine is warm, the mixture is poor; the ideal color of the candle insulator is brick and brown.
Ignition system: diagnosis and maintenance
Reliable launch and stable operation Hey, 25. It's impossible to do this without a proper ignition system, and whether you have a contact magneto or an electronic contactless ignition, the principle of verification is the same: there's a spark and the right angle of advance. A weak spark or no spark at high revs often indicates a high-voltage wire failure or a coil failure.
In contact systems, the main enemy is the oxidation of the contacts of the interrupter and wear of the cam. The gap between the contacts should be strictly within 0.25-0.35 mm. The adjustment of the gap is made by moving the fixed contact, and the angle of ignition advance is set by turning the base of the interrupter or changing the position of the flywheel relative to the crankshaft.
- 🔧 Regularly check the condition of spark plugs; black charcoal indicates problems with the combustion of the mixture.
- ⚡ High-voltage wire should not have cracks; in the dark you can see a "runaway" spark when breaking the insulation.
- 🧲 Flywheel magnets should not have chipped, and the gap between the magnets and the coil should meet the specification (usually 0.3-0.5 mm).
When switching to electronic ignition, it is important to set the correct spark-pointA few degrees error can result in detonation (a beeping knock under load) or, conversely, overheating due to late ignition. Use the strobe to fine-tune if possible, or navigate by the tags on the flywheel.
Timely replacement of candles and checking the gap in the contacts (or serviceability of the Hall sensor in electronics) eliminates 80% of problems with starting the engine.
Maintenance of the DW and reducer
The bottom of the motor, or lower unit, is the main mechanical load and the aggressive aqueous environment, and inside the daydvut is a gearbox that transmits the rotation from the engine shaft to the propeller, and the main task of the owner is to monitor the tightness of the oss and the condition of the oil in the gearbox.
The oil in the gearbox should be changed at least once a season or every 50 motor hours. When draining old oil, pay attention to its color and the presence of an emulsion. If the oil has acquired a milky hue (the color of coffee with milk), this is a signal that water enters the glands. Operating with water in the gearbox will quickly disable the gears due to corrosion and lack of lubrication.
The propeller also requires attention. The presence of chipped, cracked or strong production of edges of the blades reduces the efficiency of the engine and increases fuel consumption. When winding a fishing line on the propeller shaft, you need to immediately stop the engine and clean the shaft, as the fishing line can damage the cuff of the obal, which will lead to water entering the engine.
☑️ Seasonal TDDW
Typical malfunctions and methods of their elimination
Even the most reliable Hey, 25. Understanding the nature of a malfunction helps to get the boat back on track quickly, and often problems are divided into fuel, electrical, and mechanical problems, and knowing how to distinguish them by symptoms saves time and money.
If the engine starts and immediately dies, most likely, clogged idle jikler or there is air sucking through the gasket of the carburetor. If the engine "troit" (works unstable, twitches), the problem may be a candle, high-voltage cap or a violation of compression.
⚠️ Warning: Never try to start the engine with the carburetor removed or the intake window open. This can lead to reverse cotton and fire, as the mixture will ignite in the intake tract.
Use a compressometer to diagnose compression. Hey, 25. A compression drop below 6-7 indicates wear of piston rings, cylinder blistering or piston burnout, and in such cases, disassembly of the engine and defective parts are required.
Tips for the operation and extension of the resource
The durability of the engine depends not only on the quality of the assembly, but also on the culture of operation. Avoid working at maximum idle speeds, always let the engine warm up before going to the planing. After an active trip, give the engine a couple of minutes to work on idles to level the temperature of the parts before stopping.
Storage of the engine also has its own peculiarities: If you're putting the boat away for the winter, make sure to make the remaining fuel from the carburetor or add a fuel stabilizer. Oil preservation of the cylinders will prevent corrosion during downtime. Remember, the right thing to do is to keep the engine in the carburetor. conservation - the pledge of an easy launch next season.
- 🚤 After each discharge in salt water, wash the cooling system with fresh water to prevent corrosion.
- 🔩 Regularly lubricate the rotating points of the rompel and the cables of the control of the consistency lubricant.
- 🌡️ Do not lower the motor too deep; the anti-cavitation stove should be submerged 5-10 cm below water level.
By following these simple rules, you will be able to Hey, 25. This engine has proven itself as a workhorse, capable of carrying heavy boats and withstanding the lowest quality fuel, but it also requires respect and care.
Which octane of gasoline is best used for Hi 25?
The AI-92 is the best choice. The AI-76 (if you can find one) requires adjustments to the ignition angle, and the AI-95 can cause overheating due to higher combustion temperatures if the engine is not adapted to it.
Why does the engine smoke on singles?
Smoke on idles is often caused by excess oil in the mixture, improper adjustment of the carburetor (rich mixture), or wear of piston rings that let oil into the combustion chamber.
How often do you change the oil in the gearbox?
It is recommended to change the oil in the gearbox every season or every 50 motor hours.
Can I use Hello 25 on a speedboat?
Yes, 25 hp is enough to get a lightweight speedboat to plane, but for heavy boats longer than 4.5 meters, that may not be enough to plane with full load.