Choosing an outboard motor for a small inflatable boat or a lightweight aluminum boat often turns into finding a compromise between budget, weight and desired speed. In this niche, Chinese brands such as the Chinese brand HideaThe 9.8 horsepower model is one of the most popular in the manufacturer’s lineup, as it formally falls into the category of up to 10 hp, which makes it easier for many owners to register with GIMS.
But behind the dry numbers in the passport, there's a pretty interesting engineering story. Hidea 9.8 Often seen by enthusiasts as a base for potential upgrades, it is structurally based on a time-tested design that is deeply rooted in licensed copies of classic Japanese designs, meaning that many nodes are unified and the safety margin allows the unit to operate in harsh conditions that are not available to lighter nines.
In this article, we will discuss in detail the technical features, real performance and nuances of maintenance of this engine, you will learn why this model is considered the “golden mean” for boats from 3 to 4 meters in length, and what hidden opportunities it harbors. two-stroke Lubrication and carburetor settings will help you avoid typical beginner mistakes.
Technical specifications and design features
The heart of the model is two-stroke The cylinder capacity is 169 cubic centimeters, which is the standard value for this power class. The design assumes a single cylinder, which ensures ease of maintenance and minimizes the number of moving parts subject to wear. The ignition system is electronic, CDI, which guarantees a stable spark even when the battery is discharged, if the electric starter is used in conjunction with the manual one.
An important element of the design is the lower unit and the gearshift system. F-N-R (Forward-Neutral-Back), controlled by vomiting or rumpling, depending on the modification, the weight of the engine in running order is about 36-38 kilograms, making it heavy enough for one person to carry, but acceptable for stationary installation on a transom. A unique feature of some versions of the Hidea 9.8 is the ability to install an electric starter as an option, which is rare in this weight class.
⚠️ Attention: When installing the motor on the boat, it is critical to follow the recommended angle of the trim. Incorrect installation of the lower unit can lead to cavitation of the propeller and overheating of the engine, even if the cooling system is working.
The exhaust system is implemented through the exhaust window in the propeller, which helps to reduce noise and vibration at low revs. The engine body is made of magnesium alloy with anti-corrosion coating, but owners of salt water bodies are recommended to regularly wash the outside with fresh water. Mikuni or its analogue provides a mixture that requires precise adjustment to achieve passport power.
- 🔹 Engine type: two-stroke, 1-cylinder with water cooling.
- 🔹 Working volume: 169 cm3, compression ratio 6.2:1.
- 🔹 Ignition system: CDI (electronic).
- 🔹 Transmission: F-N-R (mechanical).
Hidden potential: Up to 15 horsepower
One of the main reasons for the popularity of the model Hidea 9.8 In the boating community, it's a structural affinity for the more powerful 15-horsepower versions. In fact, many of the units are assembled on the same conveyor and differ only in software or mechanical constraints. Intake and exhaust manifolds and the cylinder head often share the same geometry, which theoretically allows for increased power by removing constraints.
The main method of improvement is to replace the petal valve and reconfigure the carburetor. In the runoff state, the petal valve may have a restrictive plate or the geometry of the petals itself, which prevents the engine from developing full speed. The angle of ignition can also be changed. To realize the potential of 15 hp, it requires replacing the petal set and, in some cases, ploughing or replacing the carburetor jeeps to enrich the mixture.
Risks of self-improvement of the engine
Self-increasing power without proper knowledge can lead to detonation, piston burnout and loss of warranty. An engine running at its limits requires better fuel and oil, as well as shorter service intervals. In addition, legally the engine will remain 9.8 hp only in documents, which may raise questions during inspection.
Owners who decided to take this step, note a significant increase in thrust on planing. PVC boat length of 3.2-3.6 meters with one person on board confidently enters planing mode, and the maximum speed increases by 3-5 km / h. piston-group When operating at the limit modes decreases.
- 🚀 Replace the petal valve with a modified one.
- 🚀 Customization of the carburetor (enrichment of the mixture at high speeds).
- 🚀 Checking and adjusting the ignition advance angle.
Fuel consumption and efficiency of operation
The question of appetite is always acute, especially given the current prices for gasoline. Two-stroke engine Hidea 9.8 consumes a fuel mixture prepared in a ratio of 1:50 (per 1 liter of gasoline 20 ml of oil). In trolling or quiet movement on the displacement, the flow is approximately 2.5 - 3 liters of the mixture per hour, which is quite economical for this power class.
When you get on plane and drive at full speed, consumption increases dramatically, and can reach 4.5 to 5 liters per hour, which is due to the need to maintain high speeds to overcome water resistance. For comparison, four-stroke analogs can be more economical by 20-30%, but they are much heavier and more expensive to buy and repair.
Use only a quality two-stroke oil labeled TC-W3. Cheap oils can form soda on a candle and piston, which will lead to a drop in compression and increased fuel consumption.
To calculate the power reserve, the owner must take into account not only data-sheet figures, but also real conditions: wind, wave, loading of the boat and fouling of the bottom. The propeller It also plays an important role: the right step allows the engine to reach maximum operating speeds without torsion, which optimizes the combustion of the mixture.
| Mode of work | Turnover (rpm) | Mixture flow rate (L/h) | Approximate speed (km/h) |
|---|---|---|---|
| Idle move | 1000 | 0.8 - 1.0 | 3 - 4 |
| trolling | 2500 | 2.5 - 3.0 | 10 - 12 |
| Full gas. | 5000-5500 | 4.5 - 5.2 | 30 - 35 |
Maintenance and maintenance
Durability of the motor Hidea The first step is breaking in. The new engine requires an enriched mixture (a ratio of 1:25) for the first 10 hours, during which you can not give full gas, it is recommended to vary the speed from 2000 to 4000, allowing the units to wipe.
Regular maintenance involves replacing spark plugs, checking compression and lubricating all mobile joints. Special attention should be paid to the cooling system. Water pump requires periodic replacement of the impeller, especially if the engine often worked in dirty or sandy water. Clogged cooling channels is one of the most common causes of serious breakdowns.
☑️ Annual motor maintenance
When conserved for the winter, you need to completely drain water from the cooling system, blow out the carburetor and treat the internal cavities of the cylinders with conserved oil. Store the engine in an upright position to avoid deformation of the ossels.
⚠️ Warning: Never leave the motor in water for long periods of time unless absolutely necessary. Reversed currents and electrochemical corrosion can destroy the lower unit and propeller in a single season.
Comparison with competitors and choice of propeller
There are many analogues on the market, such as Tohatsu, Yamaha or HDX. Hidea 9.8 While the quality of casting and assembly has increased significantly in recent years, while Yamaha is the benchmark for reliability and liquidity in the secondary market, Hidea is a smart choice for those who want to get the most performance for a minimum budget.
The most important element of the boat-motor system is the propeller. The regular propeller is often a compromise solution. For heavy boats or full load, it makes sense to install a screw with a smaller pitch so that the engine can be more easily unwinded. For light inflatable boats and achieving maximum speed, a propeller with a larger pitch will suit.
The rotor is selected experimentally using a tachometer, and the goal is to reach the maximum speed range (as indicated in the instructions, usually 5000-5500 rpm) with a fully open throttle and standard loading. If the motor does not twist, the step should be reduced, if it twists, increase.
Frequent malfunctions and methods of their elimination
Like any technique, Hidea 9.8 The most common of these problems is the difficulty of starting after winter downtime, usually due to loss of tightness of the crankshaft glands or a malfunction of the fuel pump, and a compression check helps to quickly diagnose the condition of the piston group: a value below 8 atmospheres requires repair.
Another problem is overheating. If the overheat indicator doesn't catch fire, but the motor loses power, maybe the water pump receiver grid is clogged or the impeller is damaged. It's also worth checking for a thermostat that can jam in the closed position. Vibration at high revs often indicates an imbalance in the propeller or damage to its blades.
Timely change of oil in the gearbox (every 100 hours or once a season) allows you to notice the ingress of water into the oil (emulsion) in time and prevent expensive repair of gears.
To self-correct minor malfunctions, the owner will need a minimum set of tools: a set of heads, screwdrivers, candle key and compressometer. More complex work, such as dismantling a carburetor or replacing glands, requires accuracy and cleanliness, since dust entering the fuel system is unacceptable.
FAQ: Frequently asked questions
Can I refuel Hidea 9.8 with AI-92 gasoline?
Yes, the engine is designed to work with AI-92 gasoline. Using gasoline with a higher octane number (AI-95 or 98) will not give an increase in power, but it will not harm the engine, but it is economically impractical.
What is the real speed of a PVC boat 320 cm with this engine?
With one person (about 80 kg) the speed will be approximately 28-32 km / h At full load (2 people + cargo) the speed will drop to 22-25 km / h, since 9.8 hp is the borderline power for confident planing of such dimensions.
Do I need to register this motor in GIMS?
Under current Russian law, registration is required for small vessels with an engine capacity of more than 8 kW (which is approximately equal to 10.88 hp). Since the Hidea 9.8 formally has a power capacity of less than 10.88 hp, registration of the engine itself is not required if the total power of all engines on the boat does not exceed this limit.
Where can I find spare parts for Hidea?
Parts for Hidea are often unified with engines Tohatsu and Yamaha (series 2-6 hp and 9.9-15 hp). Many consumables (candles, glands, pads, impellers) are suitable from these brands, which makes it easier to find components in specialized stores.