Choosing a power unit for a small vessel is always about balancing cost, reliability and performance. In the low-power segment, the focus is on the engine. The Toyama T5BMS outboard motorThe turbocharged engine, which has proven to be an affordable solution for lightweight inflatable boats and small boats, is often the first major acquisition for aspiring water-engineers looking for an alternative to more expensive brands.
Model Toyama T5BMS It is a two-stroke engine, which determines the specifics of its use and maintenance, and is designed as a compact power unit, designed to meet the requirements of mobility and ease of transportation. The power of 5 horsepower is borderline, as it allows you to drive a boat without registration with the GIMS under certain conditions. This makes the engine extremely attractive for fishermen and fans of weekend walks.
In this article, we will discuss in detail the technical nuances, features of running and real experience of operating this engine. Understanding the principles of the two-stroke system will help to extend the life of the engine and avoid common mistakes when using it on the water.
Technical specifications and design features
The heart of the model Toyama T5BMS It's a single-cylinder two-stroke internal combustion engine, which delivers high power density with a minimum weight, which is critical for light craft, and a cylinder displacement of 98 cubic centimeters, which is standard for this power class.
The cooling system is based on the principle of forced circulation of water from the water pump, which requires constant monitoring of the control jet, which indicates the normal operation of the pump. The cooling system is one of the key components that needs attention.
- 🚀 Engine type: two-stroke, single-cylinder with forced air cooling (casecase) and water (cylinder).
- ⚙️ Ignition system: electronic CDI, which does not require adjustment of the candle gap during operation.
- ⛓️ Rotation transmission: straight, with the possibility of reverse (front / rear stroke).
- 📏 Weight: about 19-20 kg in full configuration, which allows you to carry the engine to one person.
It is important to note the presence of a forced lubrication system in some versions, but the basic version T5BMS The fuel tank is often manually prepared, a 1.2-liter fuel tank is integrated into the structure or supplied separately, providing a range of several hours of operation in an economical mode.
⚠️ Note: Using pure gasoline without adding engine oil for two-stroke engines will cause the piston to bully and the engine to fail in a matter of minutes.
Food system and preparation of fuel mixture
Since Toyama T5BMS It's a two-stroke engine, and the quality and the correctness of the fuel mixture directly affect its durability. The two-stroke cycle involves lubricating the rubbing parts with oil dissolved in gasoline. When it burns, it creates working gas and simultaneously lubricates the crankshaft bearings and the piston group.
The mixture must be made using high-octane gasoline (usually AI-92 or AI-95, depending on the manufacturer's recommendations in the particular batch) and special synthetic or semi-synthetic oil for two-stroke engines. The mixing ratio is usually 1:25 for the break-in period and 1:50 for continuous operation, but the exact data should always be checked with the instructions.
The mixing process must take place in a clean canister, rather than directly in the engine tank, to ensure the homogeneity of the emulsion, and the mixture must be stirred carefully before each refueling, since the oil has the property of settling.
Can I store the finished mixture?
The finished fuel mixture is not recommended to be stored for longer than 2-3 weeks. Over time, the gasoline oxidizes and the oil loses its lubricating properties, which can lead to the formation of soak and exhaust windows. It is better to prepare the mixture in small portions immediately before getting on the water.
Poor-quality fuel or violation of the proportions of oil leads to two extremes: either the engine runs on "hungry" soldering and overheats, or candles overgrown with charcoal due to excess oil. carburetor The engine is sensitive to pollution, so it is recommended to use a fuel filter-sludge.
Procedure for breaking in of a new engine
Running is a critical stage on which the resource depends Toyama T5BMS In the future, when the piston rings are lapped against the cylinder walls, ignoring the rules of running can lead to loss of compression and increased oil consumption later on.
The break-in process takes about 10 liters of fuel or about 2-3 hours of operation. At this time, you can not give full gas. The engine must operate in a gentle mode, alternating loads.
☑️ Checklist of proper breaking in
During the break-in, you need to monitor the temperature of the body and the presence of a control jet of water. If the jet is interrupted or disappears, the motor should be immediately silenced. After the first tanks of the mixture are developed, it is recommended to check the tightening of the bolts and nuts, since vibration can weaken the connections.
⚠️ Note: Do not run the engine on land without immersing the lower unit in water even for a short time - this is guaranteed to lead to overheating and deformation of parts.
Control, transmission and lower unit
The engine is controlled by a ramper, which allows you to change the angle of rotation of the engine and, accordingly, the boat's course. The throttle handle and the engine emergency stop button (kill-switch) are located on the handle of the crank or on the body of the lower unit, providing a transition between the modes of neutral, forward and reverse.
Transmission Toyama T5BMS It's a direct-drive system that minimizes power loss, so the gears are immersed in oil that needs to be changed periodically, and it's made of light alloys and coated with corrosion-resistant compounds, but after each operation in salt water, it's recommended to wash it with fresh water.
The table below shows the main parameters of the transmission and lower unit:
| Parameter | Meaning | Note |
|---|---|---|
| Type of transmission | Wheeled | Single-stage |
| Transmissions | F-N-R | Go Neutral Back. |
| Lubrication of the gearbox | Transmission oil | Replacement once a season or 100 motor hours |
| lower unit height | 363 mm (S) | For standard-height transverses |
| Vint | 2 blades | Aluminum, step 5-6 inches |
When controlled, a sharp gas throw when the gear is turned on can cause the gears of the gears to break, and it is also worth noting that at low speeds, controlling the tiller requires some skill due to the lack of a hydraulic amplifier.
To facilitate control at high speeds, you can install a rampel extension cord or transom wheels, if the design of the boat allows their installation.
Maintenance and troubleshooting
Regular. maintenance - the guarantee of stable work Toyama T5BMSThe main consumable is the spark plug, which needs to be checked after each heavy operation, and the color of the coar on the candle can tell a lot about the state of the engine: black soda indicates a rich mixture, white indicates poor or overheating.
In addition to the candle, attention should be paid to the condition of the anodes (if they are installed in your modification), which protect the metal parts from electrochemical corrosion. Once a season, it is recommended to remove the gearbox cover and check the oil for emulsion (water).
- 🔧 Checking fuel hoses for cracks and scuffs before each season.
- 💧 Lubrication of rotary mechanisms and cables of control of lithium lubrication.
- 🧹 Cleaning water intake holes from algae and debris after each trip.
A common problem with two-stroke engines is the loss of a spark or clogging of the carburetor. If the engine does not start, the first thing to check is the spark on the candle and the fuel flow. Often the cause of problems is the old fuel left in the carburetor after winter storage.
⚠️ Warning: When storing the engine in the off-season, be sure to produce the residue of fuel from the carburetor or use a fuel stabilizer, otherwise the gasoline fractions will evaporate, and the resinous residues will clog the jellyplates.
Comparison with analogues and final conclusions
In its price segment Toyama T5BMS It competes with brands such as Hidea, Sea-Pro and Mikatsu, and Toyama’s main advantage is its affordable price and simplicity of construction, making it easier to repair in the field, but the noise and vibration levels of two-stroke engines in this class are traditionally higher than those of four-stroke engines.
Users note good thrust at low revs, which is important for trolling or swimming against the current. At the same time, the maximum speed of a boat with this engine will be limited to 5 hp. For a single PVC inflatable boat up to 3 meters long, this is the best option.
Toyama T5BMS is a budget “working” engine for light boats, requiring careful attention to the preparation of the mixture and regular cleaning, but offering an excellent ratio of price and traction specifications.
When you choose this engine, you get a time-tested design that, if properly maintained, can last for many years, and the key is not to ignore the requirements for the running and quality of fuels.
Frequently Asked Questions (FAQ)
Do I need to register the Toyama T5BMS engine in GIMS?
According to the legislation of the Russian Federation, registration is subject to small vessels with outboard motors with a capacity of more than 8 hp (5.88 kW). Since the power of the Toyama T5BMS is 5 hp, formal registration is not required if the total weight of the equipped vessel with an engine does not exceed 200 kg.
What kind of gasoline is best used for this engine?
The manufacturer recommends the use of gasoline brand AI-92 with an octane number of not less than 90. the use of gasoline AI-95 is permissible, but not always advisable for two-stroke engines of this capacity, as they are designed for 92nd gasoline.
Why does the engine smoke when it's working?
Two-stroke engines always emit smoke because the oil burns with the gasoline. Plenty of blue smoke may indicate that the oil mixture is too rich (disproportion) or that the engine has not yet reached the operating temperature. If the smoke is black and the engine is choking, the air filter may be clogged or the carburetor overflows.
Can the motor be kept upright?
Yeah, Toyama T5BMS You can store it upright (on a lower unit) or horizontally on the side, but if the motor is stored with residue fuel in the carburetor, the vertical position is preferable to avoid leakage of gasoline through the glands, and the best option is to drain the fuel completely before long storage.