The choice of powertrain for a small vessel often becomes a compromise between power, weight and cost of operation. In the outboard segment, models that combine the reliability of time-tested designs with an affordable price are especially popular. Nissan Marin 9.8 two-stroke outboard motorIt has been a bestseller for many years among owners of inflatable boats and small boats.
This model is a classic two-stroke engine with loop purge, which provides it with excellent traction at low revs. Nissan Marine It has established itself as a manufacturer that pays special attention to engine life, using modern alloys and a high-quality lubrication system. For many fishermen and lovers of recreation on the water, this engine becomes the “golden mean”.
In this article, we will take a closer look at the technical details, the service features and the real-world capabilities of this unit. Understanding the principles of the two-stroke system will help you extend the life of the equipment and avoid typical errors in operation.
Technical specifications and design features
At the heart of the model is a single-cylinder water-cooled internal combustion engine, with a displacement of 169 cubic centimeters, which, at a compression ratio of 6.0:1, allows you to remove the declared power of 9.8 horsepower. loop-blowMinimizes mixing of fresh fuel mixture with exhaust gases, increasing the efficiency of combustion.
The dry weight of the engine is only 25.5 kg, making it one of the lightest in its class, a critical parameter for transportation. Nissan Marine 9.8 Carter is made of an aluminum alloy that is resistant to corrosion, and Daydwell is coated with an anti-corrosion coating that protects against aggressive salt water.
The ignition system is based on the electronic CDI (Capacitor Discharge Ignition), which guarantees stable start in all weather conditions. The absence of mechanical interrupters eliminates the need for regular adjustment. Exhaust is carried out through a deadwell, which significantly reduces noise levels under water and vibration on the transom.
⚠️ Note: When running a new engine, strictly observe the proportion of oil in gasoline specified in the instructions. Using the mixture "by eye" can lead to a bully of the piston group in the first hours of operation.
For a deeper understanding of the parameters, consider the comparative specifications table:
| Parameter | Meaning | Unit of measurement |
|---|---|---|
| Power | 9.8 | hp |
| Workload | 169 | cm3 |
| Weight (dry) | 25.5 | kilogram |
| Ignition system | CDI | - |
| Fuel tank | 12 | litter |
Advantages of two-stroke circuit in this model
The two-stroke cycle of the engine is often criticized for high fuel consumption and environmental friendliness, but in the class of small power it has undeniable advantages. Nissan Marin outboard motor 9.8 It has a very good power-to-weight ratio, and the absence of a complex valve mechanism (camshafts, pushers) makes it as simple as possible and maintainable in the field.
The key advantage is the high torque at low revs, which allows you to confidently planing boats with full load, when four-stroke analogues can "choke" and two-stroke engines are less sensitive to the roll and differentiation of the vessel, which is important when fishing standing or in high excitement.
The lubrication system with oil added directly to the fuel ensures lubrication of all rubbing vapors, including crankshaft bearings, even when operating at high revs. Nissan Marine It uses technology that reduces the smoke of the exhaust, which makes operation more comfortable for passengers.
It's easy to transport, and you can transport a two-stroke in any position without fear of oil leaking out of the crankcase, because there's no separate oil crankcase, and that eliminates the need to drain the oil before every trip in the trunk of the car.
Preparation for operation and first launch
Before you get on the water, you need to properly prepare the power unit. First of all, check the state of the spark plug. For this model, it is recommended to use NGK BR7HS candles or equivalents. The clearance should be within 0.6-0.7 mm. Candle It is an indicator of engine health: black soda will indicate a rich mixture, white - poor.
The preparation of the fuel mixture is the most important step. Use only high-quality AI-92 or AI-95 gasoline and a special two-stroke oil labeled TC-W3. The ratio for running is usually 1:25, for further use - 1:50. Mix the mixture carefully in a separate container before pouring into the tank.
The launch process is as follows:
- 🔧 Install the motor on the transom, making sure that the anti-cavitation plate is 1-2 cm below the water level.
- 💧 Connect the fuel hose, having previously pumped the system with a pear-primer to elasticity.
- 🎛️ Transfer the gas handle to the "Start" position or slightly above idling.
- 🌀 Pull the starter's handle in a sharp but smooth motion before the flash.
⚠️ Warning: Never run the motor out of water or without an external water supply. Dry operation will instantly disable the impeller pumps and gums.
After starting, allow the engine to warm up at idle speeds for 3-5 minutes. Watch the control stream of water, which should confidently come out of the control hole. The absence of a jet indicates a malfunction of the cooling system or clogging of the water intake.
break-in modes and engine life
Proper breaking in is the key to a long life for your Nissan Marine 9.8Many owners neglect this stage, which leads to reduced compression and increased fuel consumption in the future. The break-in process takes about 10 hours and must take place on an enriched mixture.
In the first hours of operation, it is not recommended to develop a power of more than 50% of the maximum. Avoid prolonged work at constant speeds, whether it is idling or full gas.
☑️ Checklist of proper breaking in
Pay special attention to the first maintenance. After the first 10 hours of operation, be sure to replace the fuel filter and check the condition of the candle. It is also recommended to stretch all threaded connections, since the vibration during the laundry of the parts is highest.
The engine life with timely maintenance and quality oil can reach 2000-3000 hours, the key factor here is the quality of the lubricant and the absence of overheating. Regularly clean the cooling shirt from salt deposits and algae.
Maintenance and troubleshooting
Regular maintenance avoids sudden breakages on the water. Every 50 hours or once a season, all lubrication points specified in the instructions should be lubricated using waterproof lithium lubricant. Pay special attention to the mechanism of rotation and tilt.
The cooling system requires periodic inspection, and if you operate the motor in salt water, fresh water washing after each exit is mandatory, and salt deposits can block the thin channels of the cooling shirt, which will lead to overheating.
Typical faults and methods of their elimination:
- 🔥 The engine won't start: check for spark, candle condition and fuel supply, and often the problem is a clogged carburetor's jelly.
- 💨 The engine stalls on idles: probably clogged idle channel or disturbed adjustment of the screw quality of the mixture.
- 🌡️ Overheating: Check the control jet, the condition of the impeller pump and the purity of the water intake holes.
To replace the impeller pump, you need to remove the bottom of the deadwell, which is a medium-sized procedure that requires careful removal of the locking rings and installation of new parts. Nissan Marine to ensure compatibility.
Comparison with competitors and final conclusions
There are many analogues on the market, such as the Yamaha 9.9, Tohatsu or Mercury. Nissan Marine 9.8 The Japanese roots of the brand provide a high level of quality control, as evidenced by the statistics of service centers.
Unlike some competitors, this model has a simplified launch system and minimal electronics, making it ideal for remote regions where it is difficult to find a qualified craftsman.
If you need a 3 to 4 meter long outboard motor that can be easily removed and taken away in the trunk, this is one of the best options on the market. It combines enough power for planing and the economy of a two-stroke cycle.
Which gasoline is best used for Nissan Marin 9.8?
It is recommended to use unleaded gasoline with an octane number of at least 92 (AI-92); the use of gasoline with a higher octane number (AI-95, AI-98) is allowed, but not mandatory.
Can this motor be used in salt water?
Yes, the motor is adapted for use in salt water, all metal parts are coated with anti-corrosion compounds, but the prerequisite is to flush the cooling system with fresh water after each exit and regularly lubricate the external mechanisms.
Do I need to dilute the oil separately or can I use it into the tank?
Oil must be mixed with gasoline in a separate container until a homogeneous emulsion is obtained before pouring into the fuel tank. Pouring oil and gasoline separately into the engine tank is strictly prohibited, as this will lead to uneven lubrication and breakage.
What is the maximum speed of a boat with this engine?
The speed depends on the type of boat, load and propeller. For an inflatable boat with a length of 3.2 meters with one passenger, the speed will be about 25-30 km / h. For heavier boats, the speed will be lower, but the thrust will remain sufficient for confident movement.