Operating water technology requires the owner not only management skills, but also a deep understanding of technical nuances, especially if we are talking about a two-stroke engine. It is the quality of the prepared fuel mixture that directly affects the life of the piston group, the reliability of the crankshaft and the overall traction of your vehicle. outboardMistakes at this stage often result in costly repairs, piston burnouts or rings, so the mixing procedure should be approached with maximum responsibility and attention to detail.
Unlike the four-stroke analogues, where the oil is in the crankcase, in the two-stroke circuit, the grease of the rubbing vapors occurs directly at the moment of combustion of the fuel. mixing-proportion The owner must be kept to the apothecary's precision, because lack of lubrication leads to bullying, and excess leads to the formation of lobe and loss of power. The owner must clearly understand that there is no universal "magic" figure, and each engine has its own specific requirements, depending on the year of production and design features.
A poorly prepared mixture can cause a sudden stop on the water, which turns from a minor trouble away from the shore into a serious safety problem. Modern oils have excellent detergent properties, but they will not be able to compensate for gross violations of fuel cooking technology. fuel-oil mixture As detailed as possible, your engine will last for many years without failure.
The principle of operation and the role of oil in a two-stroke engine
The two-stroke internal combustion engine is simpler than its four-stroke counterpart, but the conditions of its components are much more extreme. The lubrication of the crank-shaft mechanism and the cylinder is due to the oil dissolved in gasoline. When the mixture passes through the carburetor and crankcase, the oil film settles on the walls and parts, ensuring a slide. corn-butter or violated the dosage, the friction of the metal against the metal will lead to instantaneous overheating.
It's critical to understand what burns everything in the cylinder, both gasoline and added oil, which is why outboard motors have special compounds that burn almost without a trace, and the use of automotive oils is strictly prohibited, because they are designed to work in a closed system and form solid charcoal when burned, clogging the exhaust windows and a silencer. Lubricating properties In water technology, it is not just a reduction in friction, it is protection against corrosion, since the motor often works in conditions of high humidity.
⚠️ Warning: Never use used engine oil or oils for four-stroke engines mixed with gasoline, guaranteed to cause resin deposits and engine failure.
Modern synthetic oils allow the engine to work cleaner and emit less smoke, which is especially important for the ecology of the reservoir and the comfort of the fisherman. TC-W3 The engine will not save if the proportions have been broken down to reduce the amount of lubrication, and owners often forget that when running a new engine, the amount of oil in the mixture must be increased to ensure that the parts are laundered.
Selection of components: gasoline and types of oils
The basis of any fuel mixture is gasoline. For most modern outboard motors, produced after the 90s, it is recommended to use gasoline with an octane number of at least 92 (AI-92). The use of fuel with a higher octane number, such as AI-95, is permissible, but not always advisable, unless the manufacturer indicated this in the instructions. petrol It tends to oxidize and lose its properties after 2-3 weeks, especially in the summer.
The second key component is a special oil for two-stroke water-cooled engines, and the canisters of these oils must have a marking on them. TC-W3 This specification ensures that the oil is designed specifically for outboard motors, emulsifies well with gasoline and does not cause corrosion of aluminum alloys. Yamalube, Tohatsu, Motul or Shell.
When choosing oil, you should pay attention to its base: mineral, semi-synthetic and synthetic. Mineral oils are cheaper, but they require more frequent replacement of the mixture and leave more soda. Synthetics are more expensive, but provide better protection at high loads and allow you to increase the intervals between maintenance.
⚠️ Warning: Do not store the finished fuel mixture for more than one month. Gasoline loses its octane number and the oil precipitates, making the mixture unusable for use in machinery.
To prepare the mixture, use only a clean canister designed specifically for fuel. The plastic should be resistant to the aggressive effects of gasoline and should not emit fuel pollutants. Ideally, if the canister has a calibration for easy measurement, but rely on the eye when marking the scale is not worth it - it is better to use a measuring glass.
Exact proportions and mixing table
The most important question that concerns each owner is: in what proportions to dilute the mixture? The answer depends on the instructions for the particular engine and the type of oil used. Old Soviet engines often required a ratio of 1:25, whereas modern Japanese and Chinese engines operate at a mixture of 1:50. mismatching This is a direct path to major repairs.
To make this easier, there's a simple formula: the amount of gasoline is divided by a number of proportions. For example, if you want to have a ratio of 1:50, you need to divide 1,000 ml of gasoline by 50, which will give you 20 ml of oil. But it's not easy to keep a calculator in your head, so here's a table that's useful to save or print. oil You need to add to different amounts of fuel.
| Proportion | Gasoline (litres) | Oil (ml) | Motor type |
|---|---|---|---|
| 1:25 | 1 | 40 | Old models, break-in |
| 1:33 | 1 | 30 | Medium power engines |
| 1:40 | 1 | 25 | Standard mixture |
| 1:50 | 1 | 20 | Modern 2 tactile |
| 1:100 | 1 | 10 | Specialty: synthetic oils |
Note that for a new motor to run, the proportion is often richer, like 1:25 or 1:30, regardless of what is written for the operating mode. This is necessary to create a denser oil film during the laundry of the rings. After the first 5-10 hours of motorcycling, they switch to the standard mixture specified in the following paragraph: user manual.
Always pour gasoline into the canister first, and then add oil, which promotes better stirring and prevents heavy oil from settling to the bottom.
Step-by-step instructions for preparing a mixture
The process of cooking fuel requires carefulness and safety, work in a well-ventilated room or outdoors, away from fire sources and sparks. Gasoline vapors are heavier than air and can accumulate near the ground, creating an explosive situation. Before you start, make sure that you have a measuring tank, a funnel with a mesh filter and a clean canister.
First, about half the amount of gasoline you need is poured into the canister, then you measure the right amount of oil and you pour it into the gasoline, and then you have to close the canister tightly and shake it intensely for 10 to 15 seconds, so that the components start to mix, then you pour in the remaining gasoline, and the shake procedure is repeated. emulsions.
☑️ Procedure for mixing
The finished mixture must be allowed to stand for a couple of minutes to release the air bubbles, and only then pour into the engine tank through a funnel with a filter. The filter will delay possible debris or fibers from rags that could accidentally get into the canister. Remember that even a microscopic mote can beat the chicler of the carburetor and stop the engine.
Typical errors and their consequences
One of the most common mistakes is to make a mixture by eye. The experienced motorists feel the proportions, but even they prefer to use measuring tanks, because the cost of error is high. piston-group It's in dry friction mode, which causes overheating and bullying, and visually, it's a loss of power and a metal ringing.
Excess oil is also harmful: it leads to the coking of spark plugs, the formation of resinous soot on the piston and the smoke of the engine, the engine begins to "choke", lose momentum, and the silencer is poured thick gray smoke. Over time, the soda can fall off in pieces and damage the sealing rings or jam the piston. dosing-precision It is a critical parameter of durability.
⚠️ Warning: Never add pure oil to the engine tank if there is already gasoline in it. Mixing should only take place in a separate container before filling the tank.
Another mistake is using old, season-old gasoline. Volatile fractions evaporate, and the octane number drops. The engine starts detonating, which destroys the piston jumpers. If you have the mixture left from last season, you better not take the risk and dispose of it through burning in a suitable furnace or give it to a special reception, but do not pour into an expensive engine.
What to do if the engine stalls on the mixture?
If the engine is dead, check the candle. If it's wet and black, it's too oily. If it's dry and light, you may have forgotten to add oil or a mixture that's too poor, which is dangerous for the engine.
Fuel storage and conservation
Proper storage of the fuel mixture is key to a successful launch next season: gasoline is hygroscopic, it absorbs moisture from the air, which leads to the dissection of the mixture and corrosion of the tank. It is recommended to store the finished mixture in a dark, cool place, in a tightly closed metal or special plastic containers.
If you're planning to conserve the boat for the winter, there are two approaches: One is to extract all the gasoline from the tank and the carburetor by running the engine on the residues; the other is to fill the tank with a full-quality mixture with a fuel stabilizer to prevent the tank walls from oxidizing; and two-stroke engines are more likely to recommend the former option to avoid the carburetor membranes drying and lacquering inside the system.
Before long storage, be sure to drain the residues of the mixture from the tank through the fuel intake hose. The carburetor is also desirable to blow. This will prevent the internal parts from corrosion and the valve needle sticking. conservation This is not just cleaning a boat in the garage, it is a set of measures to preserve the mechanical part.
The ideal storage mix is fresh gasoline and synthetic oil mixed just before the season.
Can I mix gasoline of different brands (AI-92 and AI-95)?
It's technically possible to mix gasolines of different octane numbers, but the final octane number will be averaged, but for an outboard motor, this is not desirable, because you can't predict exactly the knock resistance of the mixture, but you'd better use the same fuel type recommended by the manufacturer.
Do I need to shake the can before each gas station?
The oil is heavier than gasoline and can eventually settle to the bottom of the canister or tank, and before each refueling and before starting the engine, the canister and tank (if available) must be shaken to ensure that the lubrication is uniformly supplied to the rubbing parts.
Why can’t you use oil for chainsaws in a outboard motor?
Chainsaw oils (often labeled JASO FB or FC) are designed for air-cooled engines and have a different additive package. They may not provide sufficient protection against corrosion in aqueous environments and produce more charring when burned than specialized outboard TC-W3 oils.