Choosing reliable and easy boat-engine For a small inflatable boat or PVC transom, it's a very important task to do. Yamaha 2 hp (often referred to as 2CMHS) holds a special place, establishing itself as a benchmark for reliability in the low-power class, often becoming the first motor for beginners or the primary tool for experienced anglers who value silence and economy.
Many potential buyers are looking for information about the justification of the high value of the Japanese brand compared to Chinese counterparts. In this article, we will discuss in detail the technical features, the real world. fuel And we'll analyze a lot of feedback from people who've already tested this engine in the field, and you'll see if you're paying too much for a logo or if it's really an investment in years of carefree operation.
It's worth noting that the two-stroke system used in this model provides excellent thrust at low revs, which is critical for trolling or swimming against the current. Yamaha It has its own service nuances, which you should know about before you buy. Let's dive into the details.
Technical specifications and design features
The heart of this little girl is single-cylinder Despite a modest volume of 49.8 cubic centimeters, engineers have managed to squeeze the maximum efficiency out of it. The engine is designed according to the classic design with a deaf shaft, which provides additional protection against corrosion and mechanical damage. The weight of the unit is only 9.8 kg, making it one of the lightest in its class, making it easy to carry even in one hand.
An important feature is the CDI ignition system, which guarantees a stable start in all weather conditions. Yamaha 2 hp It is equipped with a 435 mm long lower unit, which is suitable for most standard inflatable boat trunks. The fuel tank is built-in, its volume is 0.9 liters, which is enough for about 2-3 hours of operation in trolling mode.
The engine body is coated with multi-layered anti-corrosion paint, which is very effective against salt water, making it suitable not only for freshwater bodies, but also for sea walks, but it is worth remembering that even a high-quality coating requires regular rinsing with fresh water after going to sea.
The Secret to Durability of lower unit
Inside the lower unit, a special lubricant is used, which is recommended to be changed every 100 motor hours or once a season to avoid water entering the gearbox through the glands.
real owner reviews: pros and cons
By analyzing powerboating forums and reviews on specialized resources, we can highlight the steady trends in owners' assessments. reliability The motors go for 10 years or more without major repairs, provided that the maintenance regulations are met.
But there are those who point to certain disadvantages, primarily the cost of parts and the difficulty of adjusting the carburetor for the inexperienced user, and some complain of vibration at high speeds, although for a two-blade propeller it is more the norm than a defect.
- ✅ High liquidity: Yamaha engines lose value very slowly and sell quickly.
- ✅ Assemblance quality: lack of backlashes, tight fit of details and high-quality painting.
- ❌ Price: The cost of the new engine is much higher than that of Chinese analogues.
- ❌ Noise: Like any two-stroke, it works louder than four-stroke counterparts.
Owners also often note the convenience of the rampel control, which allows intuitively controlling thrust. For many anglers, it is the ability to accurately adjust the gas at low speeds that becomes a decisive factor in choosing a thrust. Yamaha 2 hp.
Fuel consumption and efficiency of operation
The question of efficiency is particularly acute given the rise in petrol prices. Yamaha 2 hp It consumes an average of about 0.8 to 1.0 liters of fuel mixture per hour when operating at full speed. In trolling mode, when the throttle is open minimally, the flow rate is reduced to 0.4 to 0.5 liters.
Use of quality oil Yamalube TC-W3 is critical for longevity engines.
Some users try to save by reducing the oil in the mixture, which is absolutely impossible, because it will lead to bullying piston group and expensive repairs. Properly prepared mixture provides not only lubrication, but also cooling rubbing parts.
Use only fresh fuel mixture. ethanol gasoline can delaminate during storage, causing problems with the carburetor. Prepare the mixture immediately before getting on the water.
breaking in and first service
The process of running is the foundation of a long life for your motor. Yamaha 2 hp It's 10 hours. You can't give full gas at this time. The first 3 hours are recommended to run at revolutions that don't exceed half the maximum power, so that the piston rings can get properly cleaned up to the cylinder.
The first maintenance is done after 10 hours, which involves changing the oil in the gearbox and checking the spark plugs, and checking the tightening of all bolt joints, as vibration in the first hours of operation could weaken them.
- 🔧 Replace the oil in the gearbox (check for emulsion).
- 🔧 Clean or replace the spark plug.
- 🔧 Grease the pivot points and adjust the angle of inclination.
- 🔧 Check the condition of the impeller water pump (visually through the control hole).
⚠️ Warning: Never run a motor without water! The operation of the water pump "dry" will cause instantaneous melting of the impeller and overheating of the lower unit.
Comparison with competitors: Tohatsu and Honda
In the market of low-power engines Yamaha There are two main competitors: Tohatsu and Honda. Tohatsu is often praised for even less weight and a little quieter performance, however, Yamaha benefits in the prevalence of service centers. Honda, in turn, offers four-stroke alternatives that are quieter but heavier and more expensive to maintain.
When choosing between these brands, consider the availability of parts in your area. Yamaha 2 hp You can find consumables (candles, oils, gaskets) in almost any city, which is a huge plus for travelers.
The table below compares the key specifications of popular two-stroke engines with a capacity of 2 hp:
| Characterization | Yamaha 2CMHS | Tohatsu M2B2 | Honda 2.0 |
|---|---|---|---|
| Weight, kg | 9.8 | 9.0 | 10.5 |
| Volume, cm3 | 49.8 | 49.8 | 49.8 |
| Fuel tank, l | 0.9 | 0.9 | 0.9 |
| Launching system | Manual | Manual | Manual |
The Yamaha 2bhp is the middle ground between Tohatsu’s weight and service availability, making it the most popular choice for PVC boats.
Typical malfunctions and methods of their elimination
Despite the high reliability, the engine can run into problems, most often owners face difficulties starting, this is usually due to contamination of the carburetor or using old fuel, cleaning the jelly and purging the fuel system solve the problem in 90% of cases.
Another common issue is overheating, and if there's no water coming from the control hole, it could be a clogged or a worn-out pump impeller, and you need to immediately shut down the engine to avoid jamming the piston.
It is also worth paying attention to the state of When they wear out, water can enter the gearbox, as you can see from the color of the oil (it turns milky), and changing the oil regularly helps diagnose this problem in time.
☑️ Diagnostics of Startup Problems
Tips for Winter Storage and Conservation
Proper preservation for the winter is key to a successful launch next spring, and after the last season, the engine must either extract the remaining fuel from the carburetor or drain it completely, preventing the formation of resinous deposits that clog the thin channels.
The motor should be stored upright in a dry room, it is recommended to remove the spark plug, drip a few milliliters of engine oil into the cylinder and pull the starter several times so that the oil is distributed along the walls of the cylinder, protecting them from corrosion.
Don't forget to lubricate all the movable joints and mounting points of the rummel with a special consistency lubricant. This will prevent the bolts and hinges from souring during downtime.
⚠️ Warning: Do not store the motor in a sealed plastic bag or case unless it is completely dried. The condensation inside will cause rapid corrosion of aluminum alloys.
Summary: Is it worth buying?
In summary, it can be said that Yamaha 2 hp It's a great choice for those who value predictability and quality, it's not the cheapest option on the market, but it's residual cost and reliability are worth the investment, and it's hard to find a better motor for fishing, hunting or family trips over short distances.
If you're willing to monitor the quality of the mixture and do regular maintenance, this motor will last you decades, and it will be a faithful assistant, which will not fail in the back taiga or on a vast reservoir.
Purchased Yamaha boat-engineYou buy not just iron, you buy confidence in every step of the way, and the feedback from thousands of happy owners around the world is the best proof of that.
Where can I buy it cheaper?
It is often more profitable to buy the engine at the end of the season (August-September), when stores are selling out, so as not to store goods in the winter.
Frequently Asked Questions (FAQ)
Which gasoline is best used for Yamaha 2 hp?
It is recommended to use AI-92 gasoline with an octane number of at least 90. AI-95 is allowed, but not mandatory. The main thing is that the gasoline is fresh and does not contain a lot of alcohols.
Can this motor be used on boats longer than 3 meters?
Technically possible, but the efficiency will be low: the 2 hp engine will be enough to bring only very light boats (up to 100-120 kg of full load) up to 3 meters long for planing, and for heavier vessels it will operate in trolling mode.
How often should you change the oil in the gearbox?
The first replacement is done after running (10 motor hours), then every 100 motor hours or once a year, regardless of mileage, before winter storage, it is better to make a replacement.
Does this model have an electric starter?
No, the Yamaha 2CMHS is only equipped with a manual starter, which is designed to reduce weight and simplify the design, and is launched by a jerk for the cord.