Choosing an outboard motor for a boat is always a compromise between budget, desired speed and reliability. - Japanese brand Tohatsu For decades, it has been a market leader, even with Mercury engines, which in itself speaks to a high level of confidence in build quality. Watercraft owners often argue about which type of engine to choose: a lightweight and noisy two-stroke or a heavy but economical four-stroke unit.
Many fishermen and water enthusiasts are drawn to the feedback of real users who operate the equipment in harsh Russian conditions. It is practical experience that allows you to identify hidden defects, understand the real fuel consumption and assess the repairability of the units in the field. Japanese It really stands out from the competition, but it has its own nuances, which you need to know before buying.
In this article, we'll bring together disparate opinions, technical statistics, and personal experience of various modifications. You'll learn why some models become legends and others cause complaints about corrosion or start-up. It's important to understand that the durability of an engine often depends not only on the manufacturer, but also on the quality of service and the correct running.
Overall reliability and build quality
The vast majority of reviews converge on one thing: mechanical The Tohatsu motors are perfect. The owners note that the gearboxes run for years without changing gears if you change the oil in a timely manner. The cases are often made of magnesium alloy with a quality paint coating that resists chipping better than many Chinese counterparts. However, even leaders have exceptions, and sometimes there are complaints about the quality of casting of specific batches.
The cooling system deserves special attention. Japanese engineers have designed efficient water pumps that rarely fail when using clean water. However, in salt water or muddy river ducts with abundant grass, the risk of overheating remains. Users recommend regular checks of the control jet, as users recommend regular checks of the control jet, as the control jet is not a problem. overheating This is the main reason for the expensive repair of the piston group.
⚠️ Warning: Despite the high corrosion resistance of the coating, owners strongly advise that after each exit in salt water, the engine be washed with fresh water. Ignoring this rule leads to rapid oxidation of aluminum alloys under the paint.
In terms of electrics, there are two things: budget models with manual starters have little to break down, and they start even after winter downtime; more sophisticated versions with electric starter and remote control require more care for the battery; and sometimes the weak spot is temperature sensors, which can give false signals when working at high speeds for long periods.
Two-stroke models: lightness against appetite
Two-stroke Tohatsu engines, such as the popular series MDS and MFS They're valued for their incredible ease of transportation, and PVC boat owners often choose them because they weigh 20-30 kg and can load the engine into a single person's car. carburetor Here it is simplified as much as possible, which makes the engine less sensitive to the quality of gasoline compared to injector analogues.
The main drawback that all users note is the high fuel consumption and the need to mix gasoline with oil. When actively operating in planing, a two-stroke can consume 30-40% more fuel than a four-stroke counterpart of the same power. In addition, the characteristic screeching and smoke of the exhaust can be annoying to others, especially when driving in a group or fishing, where silence is important.
Use only high-quality synthetic oils for two-stroke engines labeled TC-W3. Cheap mineral oils lead to rapid coking of exhaust windows and loss of power.
However, for short-term exits and hunting, these motors are out of competition. They can be transported in any position, they are not afraid of rolling and instantly develop maximum traction. For many anglers, the ability to quickly pull the motor out of the water and put it on board outweighs all the downsides of high flow.
- 🚀 Instant access to glides due to high torque at low revs.
- ⚖️ Minimum weight, which is critical for inflatable boats of short length.
- 🔧 The simplicity of the design allows you to perform minor repairs yourself in the field.
- 💸 Lower initial cost compared to four-stroke analogues.
Four-stroke engines: economy and comfort
Four-stroke modifications, denoted by the marking MFSThe first thing that people who have switched from two-stroke to four-stroke is that they notice the silence of the work and the lack of need to prepare the fuel mixture, the gasoline is poured into the tank clean, and the oil is in a separate crankcase, which makes it much easier to do so. maintenance And it extends the life of the engine.
The fuel consumption of these engines is really impressive, and at cruising speeds, savings can be as high as a few liters per hour, which translates into a significant financial benefit on long-distance journeys, and four-stroke engines run at lower rpms, which reduces vibration and noise, making fishing more comfortable, but these benefits come with increased weight and more complex construction.
The secret of the durability of the four-stroke
Regularly changing the oil in the crankcase (every 100 hours or once a season) is critical. Unlike two-stroke oils, where the oil burns, it circulates and gradually loses its properties, contaminated with wear products.
There is a common misconception that four-stroke engines are worse at keeping glides, and owners' feedback refutes this: modern Tohatsu models are equipped with phase change systems that allow efficient use of power, problems can only arise when operating on overweight boats, when the power reserve is adjacent.
⚠️ Warning: Four-stroke engines are strictly not transported on the side or upside down without first draining oil from the crankcase.
Comparison of specifications of popular models
To make a final decision, you need to compare the technical parameters of the different modifications. The table below shows data based on data-sheet specifications and averaged fuel consumption indicators according to user reviews.
| Model | Type | Weight (kg) | Expenditure (L/h)* | Features |
|---|---|---|---|---|
| Tohatsu M 9.8 B2 | two-stroke | 27 | 3.5 - 4.0 | Classic, very reliable. |
| Tohatsu MFS 9.8 C | four-stroke | 37 | 2.2 - 2.8 | Quiet, economical. |
| Tohatsu M 30 B2 | two-stroke | 49 | 8.0 - 9.5 | Powerful, for heavy boats |
| Tohatsu MFS 30 C | four-stroke | 58 | 5.5 - 6.5 | Stable traction, low noise |
As you can see from the table, the weight difference between two-stroke and four-stroke models of the same power can be as high as 10 kilograms or more. This is a significant factor for owners of light inflatable boats, where each kilogram affects driving performance. However, the difference in fuel consumption during heavy operation pays off the excess weight in a couple of seasons.
The choice between 2T and 4T is the choice between minimum weight (2T) and minimum operating costs (4T).
Typical problems and their solutions
Despite the overall reliability, owners identify a number of common problems they have encountered in the operation. thermostat When we jam it in the closed position, the engine boils quickly, which can lead to serious consequences, and the solution is one: preventive replacement or removal (with an understanding of the risks of operating the engine at low temperatures) in regions with warm water.
Another common problem is corrosion of the exhaust system and silencer. Exhaust gases contain moisture and aggressive compounds that destroy metal from the inside. Many users recommend regularly lubricating the internal cavities of the exhaust tract with preservative sprays, especially before long-term storage.
☑️ Diagnostics of Startup Problems
Problems with the carburetor on two-stroke engines are usually associated with the use of poor-quality gasoline or ethanol-containing fuels. Ethanol has the ability to accumulate moisture and destroy rubber seals. If the motor is not used for a long time, it is recommended either to drain the fuel or use stabilizers. Otherwise, cleaning the carburetor jelly is a mandatory procedure.
Maintenance and operation advice
Tohatsu's engine has to be serviced for years to come, and it's a very strict maintenance policy. break-inNew motors require for the first 10 hours to be used on the enriched mixture, and ignoring this phase results in accelerated wear and tear on piston rings and reduced compression in the future.
Regularly changing the oil in the gearbox is another critical point: the oil should be changed every season or after every 100 motor hours. When changing, you should pay attention to the color of the oil: if it becomes emulsive (the color of coffee with milk), this is a signal that water enters through the coils, in which case you need to immediately replace the seals.
The order of conservation for the winter:1. drain the water from the cooling system.
2. Treat the internal cavities of the cylinders with preservative oil.
3. Close the fuel crane and develop the remaining gasoline from the carburetor.
4. Remove spark plugs and add some oil to the cylinders by turning the crankshaft.
5. Set the motor upright in a dry position.
Also worth paying attention to the condition of the propeller. Even small bullies or chips on the blades reduce the efficiency of the engine and can cause vibration. Regular lubrication of the paddle shaft strands prevents the propeller from boiling, which is especially important for motors that often operate in salt water.
Do I need to wash the carburetor every year?
If you use quality gasoline without alcohol and the engine is stable, you don't need to completely disassemble the carburetor. You just need to use a fuel system cleaner that you add to the tank.
Final opinion and recommendations
Summing up the review analysis, it is safe to say that outboard motors Tohatsu They're one of the best products on the market, combining decades of reliability with modern technology, and for anglers who value silence and economy, the four-stroke series is the perfect choice. MFSThey're quiet, they don't require fuel mixing, and they allow you to focus on the fishing process.
For hunters, hikers and light boat owners who care about mobility and simplicity, two-stroke engines will remain the leader, their ease and ability to operate in any position make them indispensable in difficult conditions, the main thing is to remember the need for quality maintenance and use of the right supplies.
⚠️ Warning: When buying an engine, be sure to check for the hologram and serial number on the cylinder block. The market is saturated with counterfeit products that may have nothing to do with Japanese quality.
Ultimately, the choice of a particular model depends on your individual boating and skiing requirements, but in any case, choosing Tohatsu gives you a product that is likely to meet your expectations and last for many seasons.
Frequently Asked Questions (FAQ)
What is the best gasoline to put in Tohatsu engines?
All modern Tohatsu engines are recommended to use AI-95 gasoline. The AI-92 is only possible on older low-compression models, but this can lead to detonation and power reduction. It is important that the gasoline is fresh and does not contain a lot of alcohol.
How often should you change the oil in a four-stroke engine?
The first oil change after running (the first 10-20 hours) should be carried out, then the regulation requires a replacement every 100 hours or once a year, even if the engine has not exhausted this resource, this is due to the oxidation of the oil and the accumulation of wear products.
Can I keep a two-stroke motor on my side?
Yes, two-stroke Tohatsu motors are structurally stored and transported in any position, as the oil is mixed with gasoline and lubricates parts during operation, but it is best to avoid the "upside down" position for a long time, so that fuel does not flow through the carburetor.
Why doesn’t the engine develop full speed?
There may be several reasons: a contaminated fuel filter, improper propeller installation (too big a step), overgrown lower unit algae or a malfunction of the ignition system, and it is worth checking whether the air valve on the tank is fully open.