Choosing a reliable outboard motor for a PVC boat or a light boat is often a challenge with many unknowns. Toyama T9.9BMS It is firmly positioned as one of the most sought-after units in the budget segment, and owners value it for its balance between affordable price and time-tested design, which is based on proven Japanese technology.
In this article, we will explore in detail why 9.9 horsepower is often called the “middle ground” for small boats. We will touch not only on the dry numbers from the manual, but also on the real nuances of operation, which only come up after hundreds of motorcycle hours.
It is worth noting that Toyama T9.9BMS It's a two-stroke powertrain that imposes certain requirements on the preparation of the fuel mixture, and understanding the principles of this engine will help you avoid the typical mistakes of beginners and significantly extend the life of the unit. Let's dive into the technical details.
Technical specifications and design features
The heart of this model is a two-cylinder engine with a displacement of 169 cubic centimeters, which ensures smooth operation at idle speeds and a confident exit to plane even when the boat is fully loaded. Carburetor system Although considered a classic food, it requires a careful attitude to the quality of gasoline and octane number.
The weight of the engine as standard is about 27 kilograms, which is a fairly light indicator that allows one person to assemble and dismantle without using special lifting mechanisms. However, the lightness should not be misleading: the body of the gearbox is made of durable aluminum alloys that are resistant to corrosion.
- 🚀 Engine type: two-stroke, 2 cylinders
- ⚙️ Cylinder capacity: 169 cm3
- ⛽ Fuel supply system: carburetor
- 🌊 Cooling system: forced, water
- 🔌 Ignition: electronic (CDI)
An important design element is the CDI ignition system, which does not require maintenance during operation, it provides a stable spark in all weather conditions, which is critical for fishing or cruising in the off-season. speed-limiter Protects the engine from overheating and destruction when operating in extreme modes.
Fuel consumption and efficiency of operation
One of the main questions that arises in potential buyers is the appetite of the engine. Two-stroke engines are traditionally considered more voracious than four-stroke counterparts, but Toyama T9.9BMS It's very reasonable, with moderate trolling or medium-speed driving, it's about 3-4 liters per hour.
The mixing ratio is usually 1:50 when using quality synthetic oils, but for the break-in period it may differ. The savings in oil can lead to piston group bullying, which will be fatal for the engine.
⚠️ Warning: Never use used oils or oils for four-stroke engines, which will lead to the formation of soot on candles and the exhaust windows, which will dramatically reduce power.
The actual consumption depends on the propeller and the state of the bottom of the boat. If you notice a sharp increase in fuel consumption without changing the operating conditions, it is worth checking the condition of the boat. spark plug And the leaky fuel hoses, and often the problem is the air sucker or the carburetor that's not properly tuned.
How to calculate the mixture correctly?
To get the perfect 1:50 mixture, you need to add 20 ml of oil per 1 liter of AI-92 or AI-95 gasoline. Use a measuring cup that comes with the kit or a large medical syringe for accuracy. Shake the can before each refueling, as the oil may settle to the bottom.
breaking in: a critical stage
The first 10 hours of operation determine the fate of your engine, and the process of running in is necessary to grind all rubbing parts, especially piston rings and cylinders, and ignoring this stage or breaking the rules of running is the most common cause of early breakdowns and denial of warranty service.
During the first three hours, it is recommended to operate the engine at speeds not exceeding 50% of the maximum power. The engine should operate in a gentle mode so that the metallic microparticles formed during latching are removed in a timely manner with the exhaust gases.
☑️ Checklist of successful break-in
Special attention should be paid to the temperature during this period. Do not allow the engine to run dry even for a split second. The water intake hole should be completely submerged in water, and the control jet should confidently beat from the signal hole. If the jet weakens or disappears, immediately shut down the engine.
Tuning: increase in power to 20 hp
Many owners are considering Toyama T9.9BMS It's true that these models are often structurally identical, and the power limitation is software-based or a carburetor-based valve, but you have to understand that this manipulation is a way of removing warranty obligations.
The process of redesigning the carburetor is usually to reconfigure the carburetor and, in some cases, to replace the petal valves or to redesign the exhaust system. Forced engine resource It can be lower if you do not monitor the quality of the lubricant.
| Parameter | Stock version (9.9 hp) | After tuning (15-20 hp) |
|---|---|---|
| Maximum speeds | ~5000-5500 rpm | ~6000-6500 rpm |
| Fuel consumption | 3-4 l/hour | 5-7 l/hour |
| Boat speed (PVC 3.2m) | 25-28 km/h | 35-40 km/h |
| Resource piston | Highly | Medium (requires control) |
If you decide to take this step, be sure to check the condition of the shaking-piston group. Factory motors can have microscopic differences in processing, which will become critical when forced. The Toyama T9.9BMS is up to 20 hp thanks to a single cylinder base with the older models of the line, but requires qualified intervention.
Typical malfunctions and methods of their elimination
Like any technique, Toyama T9.9BMS They can be in some way in operation, most often fuel quality or storage issues, and timely diagnosis can eliminate most of them on their own without having to go to the service.
Starting problems often lie in spark plugs. If the candle is wet and black, it indicates a re-enriched mixture or spark problem. If it is dry, the fuel does not enter the cylinder. Regular cleaning of the carburetor and replacing fuel filters (especially if you use a sink tank) work wonders.
- 🔥 The engine stalls on idles: adjustment of the screw quality of the mixture or cleaning of the idle stroke of the carburetor is required.
- 🌡️ Overheating of the body: Check the control stream of water, perhaps a clogged cooling shirt or damaged impeller pump.
- 💨 Power loss: Check the air filter and exhaust window condition for coarseness.
And the vibration is also worth mentioning, and if the motor is vibrating more than usual, check the tightening of the lower unit bolts to the leg and the condition of the lower unit thrusts. The luft in these nodes not only creates discomfort, but can also lead to breakage. gearshifter.
⚠️ Warning: If you experience a knock or metal ringing, stop driving immediately. Continued operation can lead to crankshaft liners turning and costly overhauls.
Preparation for winter storage
Properly conserving the engine for the winter is key to making it easy to start next spring, two-stroke engines are sensitive to moisture residue and old fuel inside the carburetor, and if you leave the gasoline in the system for a few months, the light fractions will evaporate and the resins will clog the jelly.
The first thing you need to do is to extract the residue of the fuel from the carburetor, so you can shut off the fuel crane and let the engine stall on its own, and then you need to twist the candles and put a small amount of engine oil (about 5-10 ml) into the cylinders, then you need to turn the starter several times or pull the cord so that the oil is distributed across the cylinder walls.
Lubricate all external metal surfaces of the motor with a special lubricant for preservation (WD-40 Specialist or analogues) to prevent corrosion from moist air in the garage or warehouse.
Store Toyama T9.9BMS Best of all, in an upright position, so that water can't leak into the muffler. Cover the motor with a breathable cover to avoid condensation, but keep the air circulating. By following these simple rules, you'll forget about the problems with starting after a winter hibernation.
Summary and recommendations
Motor. Toyama T9.9BMS It's a reliable workman for small bodies of water and fishing, and it's not without the disadvantages of budget technology, but it offers excellent repairability and availability of parts, and for many owners, it's the first step into the world of boating technology.
With proper maintenance and high-quality fuel, this unit can travel hundreds of hours, transporting fishermen and tourists to cherished places, the main thing is not to ignore the work schedule and listen to the sound of the engine running, which will tell you if something goes wrong.
The Toyama T9.9BMS is the best choice for boats up to 3.6 meters long, offering the best balance of price, weight and maintainability in its class.
Frequently Asked Questions (FAQ)
What is the best gasoline for the Toyama T9.9BMS?
It is recommended to use gasoline with an octane number not lower than AI-92, the use of AI-95 is allowed, but not strictly mandatory, the main thing is the freshness of the fuel and the absence of water impurities.
Do I need to disassemble the engine after running?
The manufacturer does not require disassembly of the engine after running in. However, replacing the fuel filter and checking the tightening of the bolt joints is mandatory. Some craftsmen recommend replacing the oil in the gearbox after the first 10 hours to remove the metal shavings.
Can this motor be used in seawater?
Saltwater operation is possible, but requires careful flushing of the cooling system with fresh water after each exit. Aluminum alloys are susceptible to corrosion, so ignoring washing will shorten the life of the motor.
Which screw is better to put for fishing?
For fishing, where low-revving traction and trolling are important, smaller-step propellers are often recommended. However, the standard aluminum propeller is well balanced for most tasks. Full-load glides may require a propeller in 8-9 inches increments.