Choosing an outboard motor for a PVC boat or a small boat is always a compromise between power, weight and cost. In the budget segment of the market, Chinese-made units occupy a special place, among which are Chinese-made units. boat-engine kamisu 9 9 It's a model that many water-engineers see as a major alternative to more expensive brands, hoping to get the most out of their money.
This power plant is often marketed as a versatile solution for fishermen and water lovers, the two-stroke design ensures ease of maintenance, and the declared specifications promise a confident exit to plane even with a full load. However, like any technique, there are nuances that you should know about before buying, to avoid disappointments.
In this article, we will take a closer look at the technical features, the actual fuel consumption and the hidden capabilities of this model, and you will learn how to run properly and what to look for when you start the engine for many years to come.
Technical specifications and design features
Constructively Kamisu 9.9 The cylinder capacity is 169 cubic centimeters, which is the standard for the 9.9 hp class, an important feature is the lubrication system, where oil is mixed with gasoline in a ratio of 1:25 during break-in and 1:50 during further operation.
The design provides a CDI (capacitor ignition) system that provides a stable spark and confident start even in wet weather. Ignition system The gearbox body is made of aluminum alloy, and the deadwel has corrosion protection, although the quality of painting can vary from batch to batch.
The gearshift system, which is implemented through the thrust of the thrust of the ramper, has three positions: forward, neutral and backward, is a very rigid mechanism, which requires clear and confident movements from the operator.
- 🚤 Engine type: two-stroke, 1-cylinder with forced cooling.
- ⚙️ Working volume: 169 cubic cm, which meets the standard for 9.9 hp.
- 🔥 Ignition system: high voltage electronic CDI.
- 💧 Cooling: Water, water intake is carried out through holes in the deadwell.
It's worth noting that the weight of the engine is about 27 kilograms, which is not the easiest figure, but it's quite acceptable for engines of this class, and transportation in the trunk of a passenger car is possible, but it requires caution.
⚠️ Warning: When transporting the motor in a horizontal position, be sure to block the fuel crane and produce the residue of fuel from the carburetor to avoid oiling candles.
Real productivity and speed indicators
Many potential buyers are wondering how fast a boat with this engine can develop, and the answer depends on many factors: the type of boat, load, condition of the propeller and even the weather. Kamisu 9.9 It is capable of plane the boat with one person on board.
When fully loaded (two people and gear), the plane can be difficult to reach unless the optimal propeller is selected. The regular propeller often has a pitch focused on fuel economy rather than maximum speed. To improve dynamics, many owners resort to replacing the propeller with a more "fenced" one.
Fuel consumption is another important parameter: in trolling or low-speed mode, the engine consumes about 1.5-2 liters of the mixture per hour. At full speed, the flow can reach 3.5-4 liters, which is the norm for two-strokes of this volume.
Use only high-quality AI-92 gasoline and special oil for two-stroke engines labeled TC-W3. The savings on oil will lead to bullies of the piston group.
Procedure for proper engine break-in
Running is a critical stage on which the resource depends boat-engine kamisu 9 9Ignoring the rules of running can lead to overheating and jamming of the piston in the first hours of operation, the process takes about 10 hours or the production of 3-4 tanks of fuel.
The first 30 minutes (or one tank) of the engine should be running at idle speeds. Don't put the full load on. Then, over the next few hours, the load can be gradually increased, but not exceed 50-60% of the maximum power. Full gas is allowed only after several tanks have been developed.
☑️ Checklist for break-in preparation
During the break-in, you should carefully monitor the temperature of the body and the presence of a jet of water from the control hole. If the jet is lost or becomes weak, immediately turn off the engine.
⚠️ Warning: Never run the engine into a dry (no water) engine, even 30 seconds of operation without water cooling can deform the cylinder head.
Carburetor adjustment and idling adjustment
Chinese engines often require initial adjustment of the carburetor after purchase, factory settings can be knocked down during transportation or simply do not meet our operating conditions, adjusting is carried out by two screws of quality and quantity of mixture.
First, you need to warm up the engine at idle speeds for 5-10 minutes. Then, rotating the quality screw, achieve maximum idling speeds. Then, with the number screw, set minimum steady speeds at which the engine does not stall.
Adjustment sequence:1. Engine heating (5-10 minutes).
2. Quality screw: find peak turnover.
Number screw: reduce to a minimum.
Repeat paragraphs 2-3 for fine-tuning.
If the engine choked when the throttle opened abruptly, the mixture is too rich, but if the gas opened, the engine stalled, the mixture is too poor, and the right setup ensures a smooth set of revolutions without dips.
The Secret to Stable Work
Often the problem with unstable idling is not the carburetor, but the air sucker through the crankshaft or gasket. Check the tightness of the crankcase by splashing WD-40 around the glands on the running engine. If the revs change, look for a leak.
specifications comparison table
To better understand the place Kamisu 9.9 In the market, if you compare it to a conventional competitor and a Japanese benchmark engine, it's going to help you get a price-performance ratio.
| Parameter | Kamisu 9.9 | Budgetary analogue | Japanese standard |
|---|---|---|---|
| Power (hp) | 9.9 | 9.9 | 9.9 |
| Weight (kg) | 27 | 26.5 | 25 |
| Launching system | Manual | Manual | Manual/Electro |
| Guarantee (month) | 12 | 6-12 | 24-36 |
| Price (relative) | Low. | Low. | High. |
As you can see from the table, boat-engine kamisu 9 9 It's a win in price, but it can be less than the weight and warranty, but for many users, cost is the deciding factor.
The 9.9 is a great choice for those who are willing to put up with a little more weight and vibration for the sake of substantial budget savings.
Frequent malfunctions and methods of their elimination
Owners may face a number of common problems during operation, most often related to the quality of the assembly or fuel system, and knowing these nuances will help to quickly get the equipment back into operation.
One of the common problems is cutting off the veneer of a flywheel or a pumple pin, which happens when you hit underwater obstacles, and you often need to replace the glands, which can start to leak water or oil.
- 🔧 Problem: The engine won't start. Solution: Check the candle (gap, gap), spark, and fuel supply.
- 🔧 Problem: Overheating of the housing. Solution: Clean the water intake holes of algae and debris, check the impeller pump.
- 🔧 Problem: Vibration on idles. Solution: Check the motor's attachment to the transom and the condition of the deadwell.
To replace the impeller impeller, it is recommended to carry out prevention every two seasons, especially if the motor often worked in muddy water or with sand.
⚠️ Warning: When disassembling the gearbox, always change the oil oils and gaskets for new ones, and using old seals is guaranteed to lead to water entering the oil.
Tuning and improvement to improve reliability
Owners who want to make the most of their equipment often resort to modernization. Replacement of the standard screw with aluminum with increased pitch It's the most popular and efficient way to speed up a boat, and it's also popular to have a better fuel filter in front of a carburetor.
Some craftsmen change the ignition system to a more modern one, although for 9.9 hp this rarely gives a noticeable increase. More useful is the refinement of the cooling system: cleaning the channels and installing a mesh on the water intake to protect against large debris.
Lifehack by noise insulation
Install additional rubber pads between the casing and the engine frame, which will reduce the resonant hum that is characteristic of Chinese two-strokes.
Also worth paying attention to fasteners: factory bolts are often made of soft metal, and their replacement with high-strength counterparts (strength grade 8.8 and above) will improve the reliability of the mounting units.
Frequently Asked Questions (FAQ)
Can this motor be used on a boat 4 meters long?
Yes, you can, but the plane will only be possible with one person on board or with very easy loading. For a four-person with two passengers, 9.9 hp may not be enough for a confident plane, the boat will go in displacement mode.
Which oil is best to pour into the mixture for Kamisu?
Use only oils with labeled oils. TC-W3Chainsaw oils (JASO FB/FC) can lead to the formation of soot and piston coking.
Why does the engine stop when you switch to reverse?
It's likely that the gearshift cable is not adjusted, or the ignition angle is knocked off when the switch is made, and you need to configure the switching mechanism according to the instructions, ensuring that the magdino turns and the gear is switched on.
Is it really possible to accelerate this engine to 12-13 hp?
In theory, removing the throttle limiter and picking up the propeller can take more power off, but it will dramatically reduce engine life, increase fuel consumption and the risk of overheating. In the runoff, it's a reliable 9.9-strong, not a race car.