Size boat powertrain selection always starts with determining the class of boat and the tasks you plan to solve on the water. For light PVC transom boats and small boats, the gold standard has been around 10 horsepower for many years. Suzuki DT 9.9 AS outboard motor It has established itself as a benchmark of reliability and simplicity.
This model is from the classic two-stroke engine school, which is still appreciated by anglers for its traction and maintenance, and the AS acronym in the title indicates the presence of a remote control system, which significantly expands the ability to install the engine on more comfortable boats. Unlike the rompel versions, the control of gas and ignition is carried out on a separate remote or rompel-gastros, allowing the captain to be more comfortable in the cockpit.
In this article, we will take a closer look at the design features of this legendary unit, discuss the nuances of its maintenance and find out why it continues to be in demand even in the era of four-stroke technology. You will learn about the real fuel consumption, the features of running and the typical problems that owners may face. Understanding these aspects will help to extend the life of your engine and get the most out of every fishing.
Technical specifications and design features
Two-stroke Suzuki DT 9.9 It's built on a time-tested crank-chamber purging circuit, with a 284 cubic centimeter engine displacement, which provides excellent low-speed traction, and this is especially important when you're going to plane with the boat full load or when you're going against a strong current, and the ignition system here is electronic, CDI, which guarantees stable sparking even when the battery is discharged.
One of the key features of the model is the presence of a full-fledged lubrication Unlike the primitive Chinese, where oil has to be mixed in a gas tank, it uses a separate tank and dispenser, which not only makes it easier to refuel, but also protects the engine from oil starvation when the gas is discharged sharply, and also reduces the gas buildup on candles and pistons.
Water cooling is done through a built-in pump located in lower unit, the design of the water pump is highly reliable and maintainable. It is important to note that the engine body is made of lightweight aluminum alloys with anti-corrosion coating, which allows it to operate in both fresh and salt water without the risk of rapid corrosion.
⚠️ Warning: When installing the motor on a transom, make sure that the water intake hole is fully submerged in water. Dry work, even for a few seconds, can lead to overheating and deformation of the gaskets of the block head.
The model’s overall dimensions and weight make it easy to transport in the trunk of a passenger car, with a dry weight of about 36 kilograms, which is an excellent indicator for an engine of such power. The presence of a built-in generator (optional or depending on the modification) allows you to charge the battery while driving or power navigation devices.
⚠️ Note: Do not use this motor to transport people as the primary means of propulsion without a second, backup motor or oars, especially in remote fishing conditions.
Control system and ergonomics
Modification with index AS This means that the gear lever (front-neutral-back) and the gas handle are moved to a comfortable steering position, which frees the transom of the boat from unnecessary mechanical thrusts and allows the captain to sit in a chair rather than standing at the motor.
The system requires the installation of control cables and electric harnesses. The standard length of cables is usually 3 meters, but can be extended if necessary using special extension cords. Japanese Suzuki cables are traditionally of high quality: they have a Teflon braid that reduces friction and protects the insides from moisture.
The ergonomics of the rumble-gastros (if combined) or the individual control box are thought out to the smallest detail. The lever has clear locks and smooth running, which allows you to accurately dispense power, and this is especially true in trolling fishing, when you need to move at a minimum speed.
Also worth mentioning is safety: Most Suzuki models include a kill-switch, a button-fungal cable attached to the operator's clothes, and if it falls overboard or snags, the engine will immediately stall, preventing the loss of the boat.
Fuel consumption and efficiency of operation
The question of appetite of the engine is always acute, especially when planning long expeditions. 9.9 hp Suzuki has a moderate fuel consumption due to optimized gas distribution phases. In trolling mode, at revolutions of about 3000-3500 per minute, the flow rate is approximately 2.5-3 liters of mixture per hour.
When driving at full gas (about 5000-5500 revolutions), the consumption increases to 4.5-5 liters per hour. However, it is worth remembering that the maximum speed is rarely used for a long time. For most tasks on the water, such as crossing to the catching point or maneuvering, 70-80% of the power is enough, which makes the motor very economical.
Use high-quality synthetic oil for two-stroke engines labeled TC-W3. This will reduce exhaust smoke and reduce the amount of carbon monoxide, which indirectly affects fuel economy by maintaining compression.
Comparative table of fuel consumption Suzuki DT 9.9 in different modes:
| Mode of work | Turnover (rpm) | Expenditure (L/hour) | Speed (km/h)* |
|---|---|---|---|
| Idle move | 900 - 1000 | 0.8 - 1.0 | 4 - 5 |
| trolling | 3000 - 3500 | 2.5 - 3.0 | 15 - 20 |
| Cruiser (75%) | 4500 - 5000 | 3.8 - 4.2 | 30 - 35 |
| Full gas. | 5500 | 4.5 - 5.0 | 40 - 45 |
* Speed is indicated approximately for a PVC boat with a length of 3.2-3.6 meters with one passenger.
It is important to consider that the actual flow rate depends on many factors: propeller, loading of the boat, the condition of the bottom and weather conditions. Properly selected pitch of the propeller allows the engine to reach maximum speed without overload, which is the key to efficiency.
break-in and first maintenance
New Suzuki DT 9.9Like any other internal combustion engine, it requires proper running, a process that is necessary to make the rubbing parts of piston rings, cylinders and crankshaft bearings work, and neglecting this stage can lead to bullying and loss of compression in the future.
The procedure of breaking in takes about 10 hours of engine operation. The first 2 hours it is recommended to operate the engine at a speed of not more than half of the maximum (up to about 2500-3000 rpm). Gas in the "open" during this period is strictly forbidden. The next 8 hours can gradually increase the load, but avoid long work on full gas.
☑️ Checklist for engine break-in
After the first 10 hours of motoring, the first maintenance is required, which includes replacing the spark plugs, checking and pulling all bolt joints, and lubricating the rotation points, and replacing the oil in the gearbox is also recommended to remove possible metal shavings that appeared during the grinding of the gears.
⚠️ Warning: During break-in, carefully monitor the control jet of water. If it disappears or becomes intermittent, immediately turn off the engine and check the cooling system to avoid catastrophic failure.
To lubricate the gearbox, only use special transmission oils for outboard motors, which have the necessary antifriction and water repellent properties, and ordinary car oil can emulsify when water enters and lose its properties.
Typical malfunctions and diagnostic methods
Despite its high reliability, Suzuki DT 9.9 AS The most common problem with two-stroke engines is that the ignition system or carburetor fails, and if the engine doesn't start, the first thing you should do is check for a spark on the candle and for the fuel to enter the combustion chamber.
Carburetor problems are often related to gasoline quality or long-term downtime. Fuel can oxidize to form a resinous plaque that clogs the jellywoods. Regular cleaning of the carburetor and the use of fuel stabilizers during long-term storage will help to avoid this trouble. It is also worth checking the condition of the fuel filter-sulphant.
Another common issue is overheating, which can be caused by a break in the impeller pump, clogging of water channels with sand or algae, or a malfunction of the thermostat. Symptoms of overheating: loss of power, change in the sound of the engine, lack of a control jet or its weak intensity.
The secret of setting up the carburetor
The perfect performance of the Suzuki carburetor often requires micro-adjustment of the quality and quantity of the mixture. Factory settings may not be suitable for high-octane fuel or high-altitude.
The reverse-clockwise rotor of the mixture quality enriches the mixture, the clockwise - depletes. The optimal position is usually in the middle of the adjustment range, but the exact value is selected experimentally by the stability of the idle and the color of the exhaust.
If the motor is "troit" or is not stable at idle speeds, the cause can be a violation of the gap between the electrodes of the candle or in the breakdown of high-voltage wire. Visual inspection of high-voltage wires in the dark sometimes helps to detect the "glow" of the current leak.
Preparation for winter storage and conservation
Proper conservation is a guarantee that next spring Suzuki boat-engine The preparation for winter begins with the full production of fuel from the carburetor or its drain, the remaining gasoline during the winter can decompose and coke the channels.
Be sure to replace the oil in the gearbox before storing. Even if it has changed recently, the old oil may contain condensate, which will cause the gears to corrosion during the winter, rinse the gearbox with fresh oil, roll the engine, and leave it inside.
Ignition plugs are better twisted, drip a few milliliters of engine oil into the cylinder and slowly turn the crankshaft with a starter (or turbo starter). This will create an oil film on the cylinder mirror. The candles spin back, but do not tighten until the end to avoid condensation.
External metal parts are recommended to be treated with anti-corrosion spray. Pay special attention to the places of chipped paint and fasteners. If the motor is stored on the boat, cover it with a special case, but ensure ventilation so that mold does not form inside.
Comparison with competitors and final conclusions
In the 10-hp market, the Suzuki DT 9.9 has serious competitors such as Tohatsu, Yamaha and Honda. However, Japan's Suzuki benefits from its "unkillable" design and availability of parts. Unlike the more sophisticated four-strokes, there's just nothing to break in electronics, and the mechanics have been tested for decades.
Many owners say that this engine eats whatever it is poured into, provided it is proportionally blended, is less sensitive to fuel quality than today's injector engines, making it an ideal choice for anglers going to remote locations without gas stations with quality gasoline.
In summary, it can be said that Suzuki DT 9.9 AS It's a rational choice for those who are looking for a balance between power, weight and price, and it's a workhorse that, with minimal care, will serve as a surefire way for many seasons, getting you to the coolest place.
Can I use the Suzuki DT 9.9 on a 4-meter boat?
Yes, it can. A 9.9 hp engine can plane a light boat up to 4 meters long with 1-2 passengers. However, the time to go to mode will increase, and the maximum speed will be lower than the more powerful analogues. For heavy boats, this engine will only work for displacement mode.
What kind of gasoline is best used for this engine?
The best choice is the AI-95 gasoline, which provides better combustion and less gas formation than the AI-92. However, the Suzuki DT 9.9 can also work on the AI-92 if the octane number meets the requirements, the main thing is freshness of the fuel and proper mixing with oil.
How often should I change the spark plugs?
The life of spark plugs on a two-stroke engine depends on the quality of the mixture and mode of operation. On average, it is recommended to change the candles every 100 hours or once a season if the scorching becomes critical. For prevention, you can clean the candles from soda and calcify the gap every 50 hours.
Do I need to warm up the engine before starting?
Yes, warming up is mandatory. After starting, let the engine run at idle speeds for 2-3 minutes, which is necessary to warm up the piston group and start circulating oil in the bearings. A sharp start on a cold engine significantly reduces its life.