Choosing a power plant for a lightweight inflatable boat or canoe often comes down to finding a balance between power, weight and reliability. Yamaha outboard motor 2 hp It is one of the most popular solutions in this segment due to the legendary quality of the brand. This unit is ideal for fishing in quiet backwaters, cruising in reservoirs and using as an auxiliary engine.
Many aquatic motorists value this model for its simplicity and unpretentiousness. The two-stroke scheme provides high torque at low revs, which is critical for heavy PVC boats. At the same time, the design of the engine allows you to easily maintain it yourself without resorting to the services of expensive service centers.
In this article, we will discuss in detail the technical nuances, features of operation and hidden advantages of this model. Yamaha 2CMHS It is often called the “workhorse” of small waters and how to extend the life of your equipment.
Technical specifications and design features
The basis of reliability of this unit is a time-tested two-stroke combustion system of the fuel mixture. The cylinder displacement is 49 cubic centimeters, which at a weight of only 8.7 kg provides excellent traction. Power 2 horsepower allows you to accelerate a boat with one or two passengers to a speed of about 5-7 km / h, which is quite enough for a quiet movement.
The ignition system here is implemented via CDI (Capacitor Discharge Ignition), which eliminates the need for a battery. The spark is generated by magneto, making the motor fully autonomous, and this is especially important for those who prefer long-duration autonomous exits to the water without unnecessary load.
The engine is cooled by force, by off-shore water, and the design of the water pump is simple but effective. impeller It is strictly forbidden to start the motor out of water or with a control hole squeezed to test the jet for more than 10-15 seconds.
- 🚤 Engine type: two-stroke, 1 cylinder
- ⚖️ Weight: 8.7 kg (excluding fuel and oil)
- ⛽ Fuel tank volume: 0.9 liters (built-in)
- 🔄 Starting system: manual (fuel pump)
⚠️ Attention: Never use pure gasoline for the engine. Mixing with oil in a ratio of 1:25 (for a new engine) or 1:50 (for a break-in) is a prerequisite for maintaining the piston group.
The secret of the durability of piston
Japanese engineers at Yamaha use a special cylinder coating that reduces friction, but it is extremely sensitive to oil quality. Using cheap mineral oils can lead to rings in as little as 50 hours.
The process of breaking in: a critical stage
Ignoring the rules of breaking in is the main reason for premature failure jelly-boatThe new engine requires grinding the parts of the cylinder-piston group, a process that takes about 10 hours of operation or the production of 5-10 full tanks of the fuel mixture.
In the first hours of operation, you can't give full gas. It's recommended to run at speeds below 50 percent of the maximum power. This allows the micron irregularities of the metal to smooth out without getting hit. If you feel like the engine is not pulling or stalling, maybe the mixture is too rich and you need to adjust the carburetor.
After every 2-3 hours of running during the break-in period, you need to let the engine cool down. Sharp temperature changes can lead to deformation of the cylinder head. It is also important to change the fuel mixture in the tank often during this period, since old components can oxidize.
☑️ Rules for first break-in
Fuel consumption and efficiency of operation
One of the key advantages of the model is its efficiency, which is that it's half-gas, which is about 2,500-3,000 revolutions per minute. Yamaha 2 hp It consumes about 0.6-0.8 liters of mixture per hour, making it ideal for trolling or slow movement to the catch point.
At full gas, the flow rate increases to 1.2-1.4 liters per hour, but in this mode the engine rarely works. It is important to use gasoline with an octane number not lower than AI-92. Using fuel with a lower octane number can cause detonation, which is destructive to the piston.
To calculate the range, we can assume that a full tank (0.9 liters) with moderate load is enough for about 1 hour of work. This time is enough to cover a distance of 5-6 kilometers. For long transitions, experienced boaters recommend carrying a spare canister with a ready-made mixture.
| Mode of work | Turnover (rpm) | Mixture flow rate (L/h) | Working time on 1 tank |
|---|---|---|---|
| Idle move | 1000-1500 | 0,3 | ~3 hours |
| Trolling (30-40%) | 2500-3000 | 0,7 | ~1.2 hours |
| Full gas (100%) | 5000-5500 | 1.3 | ~40 minutes |
To save fuel and engine life, try to keep the planing at the lowest possible speeds. Extra 500 rpm over the necessary increase the consumption by almost 15%.
Maintenance and preparation for winter storage
Regular maintenance is the key to a long life for your child Yamaha 2bhp.After each application, especially if you've been swimming in salty or dirty water, the engine needs to be washed with fresh water, which will prevent metal parts from corrosion and salt deposits in the cooling system.
Every 50 hours or once a season, you should check the state of the spark plug. The stain on the candle can tell you about the state of the engine: black soda indicates a rich mixture, white indicates a poor or overheating. You also need to lubricate all hinges and points of rotation of the handle of the tiller.
In preparation for winter, it's critical to mothball the engine, so the engine has to make all the gasoline out of the carburetor, you can just let it work to a stop by shutting off the fuel faucet, and you can't leave the engine with gasoline inside for the winter, and that will lead to resination and acidification of the jelly.
- 🔧 Checking and replacing the spark plug
- 💧 lower unit lubricant and gearbox
- 🧹 Cleaning the algae cooling system
- 🛢️ Replacement of oil in the gearbox (once a season)
⚠️ Attention: When you store the motor, never put it vertically on a lower unit (screw), butter from the gearbox can leak into the cylinder, which will cause a hydraulic shock the next time you start, stored strictly in the working position or on a special stand.
Typical malfunctions and methods of their elimination
Despite its high reliability, Yamaha outboard motors They can cause problems when they're not used properly. The most common problem is refusal to start. 90 percent of the time, it's because there's no spark or a candle is poured with fuel. The first problem is to replace the candle or check the cap, the second problem is to dry the cylinder.
The second common problem is overheating. If you notice that there is no water coming from the control hole, immediately turn off the engine. The reasons may be clogging the water intake with sand or grass, or wear on the impeller pump.
The third symptom is power loss and vibration, and often it indicates a fishing line or net winding onto a screw, which creates an imbalance and can damage the Dadwood ovens, and it's also worth checking the condition of the anti-cavitation stove, which if it's damaged, the motor will take in air.
Comparison with competitors and final conclusions
There are many analogues on the market, such as Tohatsu, Mercury or Chinese brands like Hidea and Sea-Pro. Yamaha 2bhp. It beats many of them in terms of materials quality and spare parts availability. Chinese copies are often heavier and have less accurate setup of the carburettor from the factory.
Engine upgrades are also possible, and many owners install a 12-liter retractable fuel tank, which solves the problem of frequent refueling, while others change the standard propeller to a more persistent one if the boat is heavily loaded, and these improvements allow the engine to be adapted to specific tasks.
So to sum up, it's one of the best engines in its class, and it combines Japanese reliability, simplicity of design, and affordable maintenance costs. The best choice in the ratio price / quality / resource For the present day.
Can this motor be used on a boat 4 meters long?
Technically, you can start, but the efficiency will be low. 2 hp engine will not be able to bring a four-meter boat with a passenger into the plane. Speed will not exceed 4-5 km / h, and fuel consumption will be unreasonably high for this speed. For boats 3.5-4 meters, power from 5 hp is recommended.
Which oil is better to pour: mineral or synthetic?
For two-stroke Yamaha engines, it is optimal to use semi-synthetic or synthetic oils labeled TC-W3. They provide less soak and better lubrication of knots. Mineral oils are only permissible during active break-in or during very low-cost operation.
Why does the engine stop at high speeds?
Most often, this indicates a "poor" mixture (low gasoline, a lot of air) or a problem with the fuel supply. Check the fuel filter, the condition of the carburetor's jelly pads and the tightness of the fuel hose.
The Yamaha 2 hp outboard motor is a standard of reliability in the small power class, requiring minimal owner intervention, provided that the rules of running and storage are observed.