Making a decision to buy an outboard motor is always a balance between the desired power, efficiency and budget. In the small watercraft segment, two-stroke models with a capacity of about 10 horsepower are deservedly popular. Nissan Marin 9.8 engine to buy It's a kind of middle ground for PVC boats and lightweight aluminum boats.
There are many options on the market, including new cabin units and mileage equipment. It is difficult to understand the nuances of trim levels, variations and hidden defects without experience. In this article, we will discuss all aspects related to the purchase of this engine in detail, so that your purchase becomes a source of joy, not headache.
It is worth noting that Nissan Marine This is a brand that is actually a rebranding of legendary engines. TohatsuBuying Nissan gives you a proven Japanese reliability, often at a more attractive price than the original Tohatsu nameplate, and understanding this relationship is critical when looking for parts and assessing technical condition.
Why you should choose 9.8 horsepower
The 9.8 hp power is not chosen by chance. This is a boundary value that allows you to operate the boat without mandatory registration with the GIMS (if the total power of the power plant does not exceed 10 hp, although the rules may change, and this threshold should be specified in the current legislation). keynote The engine is powerful enough to plane a boat with two adult passengers and a small load.
These engines are simple and maintainable, and the two-stroke circuit provides high torque at low speeds, which is important for heavy boats or when driving against the current, and are usually lighter than four-stroke engines of the same power, making it easier to transport and hinge the transom.
⚠️ Note: When buying a 9.8 hp engine, be sure to check the documents. Some unscrupulous sellers may sell deforested 15 hp engines for 9.8 to avoid registration. Make sure the markings on the carburetor and passport match, otherwise there may be problems with the law.
Economy also plays a role: a 9.8 hp two-stroke fuel consumption is about 2.5-3 liters per hour at full speed, but at cruising speed it is much lower, making the engine an excellent choice for fishing or cruising, where you do not need constant work at the limit of your capabilities.
Where to Find the Best Engine by Nissan Marin
Finding a reliable seller is half the success. There are several main channels through which you can find a reliable seller. Nissan Marin engine 9.8 hp BuyOfficial dealers offer new units with a full factory warranty, which is the safest, but also the most expensive way, and the price is based on pre-sales preparation, break-in (sometimes) and confidence in the originality of the product.
The second popular option is specialized water appliance stores that operate on parallel imports or sell privately imported equipment, prices may be lower, but warranty obligations are often limited or shifted to service centers, and it is important to check the reputation of such a company in profile forums.
- 🚤 Official dealerships: quality guarantee, but high price.
- 💰 Private Ads (Avito, Drom): the risk of running into hidden defects, but you can find a profitable used version.
- 🛠 Service workshops: sometimes sell after-trade-in engines or remanufactured units.
- 🌐 Overseas sites: ordering from Japan or China, requires knowledge of customs and logistics.
When buying from hand, always demand the ability to test the engine on water. Visual inspection will not tell you anything about compression in the cylinders or the condition of the piston rings. If the seller refuses to test drive, this is an occasion to think about the feasibility of the transaction.
Technical specifications and features of the model
Engine. Nissan Marine 9.8B It's based on a proven platform, a single-cylinder two-stroke engine with loop purges, which effectively cleans the cylinder of exhaust gases and fills it well with a fresh fuel mixture, and the dry engine weighs about 26 kilograms, making it easy enough for one person to carry, although it's not a problem to have a second hand when you install it.
The ignition system in these engines is usually electronic (CDI), which eliminates the need to adjust the gap and replace the interrupter contacts, as in the old magdinos. Starting is done manually, with a cable. Despite the apparent simplicity, the quality of the assembly of Japanese engines allows them to work for years without opening the crank chamber.
The secret of high reliability
Nissan Marine engines are based on the Tohatsu cylinder block, often only in the colour of the lower unit, carburetor (sometimes) and nameplate, which means that Tohatsu parts are 99 percent suitable, making it easier to service in areas where there are no Nissan official.
Cooling is done by off-board water through a pump in a lower unit, and the pump's wing is a consumable, but it lasts a long time, provided that clean gasoline is used and there is no dry work.
| Parameter | Meaning | Note |
|---|---|---|
| Type of engine | two-stroke, 1 cylinder | Loop purge |
| Workload | 169 cubic centimetres | Standard for the 10 hp class. |
| Max. Power. | 9.8 hp | At 5000-5500 rpm |
| Weight (no fuel) | 26 kg | One of the lungs in the class. |
| Launching system | Hand (Tross) | Reliable and simple. |
Nuances of buying a used motor
Decided Nissan Marin 9.8 engine to buy You have to be prepared for a thorough diagnosis. Two-stroke engines are hardy, but misuse by the previous owner could have caused irreparable harm. First, check out the lower unit. The presence of chips, dents or stone impact marks is a warning sign. Even if the motor is working, the geometry of the lower unit could have been disrupted, leading to vibrations and the destruction of the crankshaft bearings.
Notice the state of the lower unit transmission. Rock the propeller. The luft should be minimal. If the screw dangles or you hear a crunch when you spin your hand, then the gears of the gearbox are worn out or there are problems with bearings. Repairing the gearbox is an expensive procedure, comparable to buying another used motor.
⚠️ Warning: Never buy a used motor without a compression check. The normal value for a healthy two-stroke is 9.8 hp - 8-10 atmospheres (kg / cm2). If the compression is below 6 atmospheres, the engine requires major repairs (ring replacement, cylinder leakage), even if the seller claims that "pulling well."
Also check the cooling system. When working on the shore (in the barrel) from the control hole, the stream of water must confidently beat. Weak pressure indicates clogging or wear of the impeller pump. Overheating is the main enemy of lower unit and the piston group.
☑️ Checking the used motor before buying
Maintenance and tuning: what you need to know the owner
The motor does not end at the time of purchase. Nissan Marine It's been in service for a long time, it requires regular maintenance. The main consumable is a quality two-stroke oil. Don't skimp on oil using cheap mineral products. Synthetics or semi-synthetics (JASO TC) will significantly extend the life of the engine and reduce the amount of soak on the candle and in the silencer.
Many owners are thinking about tuning. The most common and useful upgrade is to install a longer lower unit leg (if the standard one is missing), or replace the regular screw with a faster or more traction one, depending on the task, and replacing the regular roumple handle with a more ergonomic one is also popular.
- 🔧 Replace oil in the gearbox: annually or every 100 hours.
- 💧 Lubrication of lower unit Shafts: Every 50 hours or after each active navigation in salt water.
- 🕯️ Cleaning of the carburetor: when unstable work or once a season.
- ⚙️ Lubrication of suspension strands: before each installation on the boat.
Storage of the engine also has its own peculiarities: in the winter, you need to completely drain the water from the cooling system (purging) and mothball the engine, pouring some oil into the cylinders and turning the crankshaft. Gasoline from the carburetor is better to develop or drain, since during the season it can stratify and clog the jelly.
Keep checks and documents for all replaced consumables. When selling a used motor, having a service history increases its liquid value by 15-20% and gives the buyer more confidence.
Comparison with competitors: Tohatsu, Yamaha, Mercury
The small capacity market Nissan Marine 9.8 There are direct competitors. Tohatsu M9.8BAs mentioned, it's pretty much the same engine. The difference may be in the carburetor settings (sometimes Nissan is a little quieter) and the color. Yamaha 9.9 (often deforested to 9.8) is considered a benchmark of reliability, but costs noticeably more. Mercury 9.9 is often re-imitated Tohatsu/Nissan, but with a higher price tag because of the brand.
Why is Nissan looking? Often the reason is price. At certain times, exchange rates or logistics chains made Nissans more accessible to Tohatsu. In addition, Nissan Marin's dealer network was better developed in some regions, which provided parts.
When choosing between brands, you should look not only at the nameplate, but also at the specific condition of the specimen. A live Nissan is better than a tired Yamaha. However, if you buy a new engine in a box, the difference will be minimal, and the price and warranty conditions will be the deciding factor.
The Nissan Marine 9.8 is a workhorse with a Japanese heart, the best choice for those looking for a balance between price, weight and reliability, and are ready to monitor the technical condition of the unit on their own.
What is the best fuel for Nissan Marine 9.8?
The manufacturer recommends using gasoline with an octane number not lower than AI-92. However, in the conditions of Russian realities and fuel quality, many experts advise pouring AI-95 from checked gas stations. This reduces the risk of detonation and the formation of soot, especially with prolonged operation at full speed.
Can the Nissan Marine 9.8 be used on seawater?
Yes, you can. Motors are corrosion-resistant. However, after each release to salt water, you need to thoroughly flush the cooling system with fresh water (you can use an adapter on a garden hose) and lubricate the external moving parts, ignoring this rule will lead to rapid corrosion wear of the pump and the lower unit.
Is it possible to make a full 15-strong 9.8 hp?
Technically, many engines in this class are structurally capable of delivering 15 hp (they have the same cylinder volume), but increasing fuel supply and changing the angle of ignition ahead of time without replacing the piston group and strengthening the crank mechanism will lead to a sharp decrease in resource. The engine will run at the limit, risking “catch a wedge” away from shore. It is not worth it.