Choosing an outboard motor for a small vessel is always about finding a balance between price, reliability and availability of spare parts. YamabisiThe silk-based silk, often referred to as "Yamers" in the market, has become a popular alternative to the more expensive Japanese models, offering a similar design at a much lower cost.
Owners of such engines often face the need for deep tuning "out of the box", as factory adjustments do not always meet the requirements of specific operating conditions. two-stroke The ignition system will allow you to carry out basic maintenance and extend the life of the power plant for many years.
In this article, we will discuss in detail the design features, nuances of carburetor adjustment and typical errors during break-in. Competent approach to operation will avoid expensive repairs and ensure stable traction on the water.
Design features and model range
The engines in this series are designed to replicate the time-tested development of Tohatsu and Mercury, which is their main advantage: simplicity of design makes diagnostics easier, and the prevalence of spare parts makes repairs available even in remote regions. aluminum-block with cast iron shells, which provides good heat transfer and resource.
The range covers a wide range of capacities, ranging from compact 2.5 hp for small flatboats to 18 hp, capable of plane with a full-fledged PVC boat with a crew, all equipped with forced water cooling and have the same layout of the main components.
The key element is carburetor The ignition system is a membrane type that theoretically allows the engine to operate at any roll, although in practice the sensitivity to the quality of the mixture remains high. The ignition system is usually based on an electronic switch (CDI), which does not require adjustment of the gap, unlike older contact systems.
⚠️ Attention: When buying, carefully check the equipment. Often the basic version does not have a valid one. gas-diversion (exhaust through the hub), and the exhaust gases go directly into the water for an outboard motor, which can be dangerous when driving against the wind.
Below is a table of the main specifications of popular modifications that are most often found on sale:
| Model | Power (hp) | Workload (cm3) | Weight (kg) | Type of management |
|---|---|---|---|---|
| YM-2.6 | 2.6 | 49 | 9.5 | rumble |
| YM-5 | 5 | 89 | 19 | rumble |
| YM-9.8 | 9.8 | 169 | 26 | rumble |
| YM-18 | 18 | 246 | 38 | Rumpling/Remote |
Proper breaking in: a critical stage
Many users make the fatal mistake of starting with a full load. break-in This is the process of grinding the piston group and bearings, which directly affects the future life of the engine, and ignoring this stage leads to cylinder bullying and loss of compression in the first 10 motor hours.
The process must be done in an enriched mixture, to do this, more oil is added to gasoline than is recommended for normal operation, usually the ratio is 1:25 (40 ml of oil per 1 liter of gasoline) during the first tanks, although the instructions may say 1:50.
- 🛥️ The first 2 tanks work at minimum speeds (idle and slightly higher), without opening the throttle more than 30-40%.
- 🛥️ The next 2-3 tanks can gradually increase the load, bringing the speed to 70-80% of the maximum, but not opening the throttle completely.
- 🛥️ After the production of 5 tanks (about 10 liters of the mixture), you can switch to a standard oil ratio of 1:50 and operate the engine in normal mode.
It is important to monitor the engine temperature. The outgoing stream of water should be warm, but not boiling water. If the engine overheats, immediately silence it and check the water intake for grass or sand.
☑️ Checklist of proper breaking in
Setup of the carburetor and fuel supply system
Factory carburetor settings are often too “poor” or unstable, causing dips when a throttle is opened sharply or difficult to start. Adjustment is carried out by two main screws: a low-revving (L) mix quality screw and an idling speed screw.
First, wrap the quality (L) screw to the point, but without fanaticism, and then turn it around 1-1.5 revolutions, that's the base point. Start the engine and let it warm up. If the engine stalls with a sharp addition of gas, the mixture is too poor, you need to turn the screw out another quarter of the revolution.
⚠️ Attention: Poor mixture (little gasoline, a lot of air) is dangerous to overheat the piston. If after adjustment the engine squeals at high speeds or the candle becomes snow-white - immediately stop operation and enrich the mixture.
It is also worth checking the condition. petal valves If the petals are not tightly attached or have cracks, the engine will start poorly and lose power, and can be gently squeezed or replaced if necessary.
Secrets of setting up gicklers
If standard screw adjustment fails to achieve stable operation, it may require a replacement of the main jeep. 9.8 hp engines often have a smaller-diameter jeekler than our gasoline needs. An increase in diameter of 2-5 units often solves the problem of dips.
Ignition system and troubleshooting spark problems
Stable sparking is key to a steady start. Yamer engines use a CDI system, where energy is stored in the capacitor and discharged into the ignition coil at the right time. hall-sensor Or flywheel.
The gap between the flywheel magnets and the ignition coil (or sensor) should be strictly 0.3-0.5 mm. If the gap is larger, the spark will be weak, especially at high revs. If less, a breakdown or mechanical grazing is possible.
To check the system, you can use a special tester or method "from the opposite":
- 🔌 Check the reliability of the "mass" contact. Poor engine grounding on the transom is often the reason for the lack of spark.
- 🔌 Look at the high-voltage cap. Inside it is a resistor that can oxidize. Unscrew it, clean it, and put it tightly in place.
- 🔌 Check the candle. Black is a rich mixture, white is a poor mixture. Normal is a brick-brown color.
If there is a spark, but it is weak (small in bright light), replace the candle with a new one with the correct potassium number. These engines are usually suitable candles NGK BR7HS or their counterparts.
When assembling a flywheel, be sure to use a dynamometer key. The crankshaft nut pull can lead to the destruction of the veneer groove, and the tightness can lead to the flywheel turning and the ignition failure.
Reductor and lower unit: maintenance and lubrication
The bottom of the motor, or lower unit, contains a gearbox that transmits the rotation to the propeller. transmission oilIt must be changed at least once a season or after 50 hours of motorized work, and if water has been injected into the oil (it becomes milky).
Replace it through the bottom hole, because the oil is heavier than water. Unscrew the bottom screw, let the old liquid drain, then inject the new oil with a syringe before it enters the top hole, which ensures that there is no air traffic.
Pay special attention to the omentums. If the gearbox shows traces of oil and the level drops quickly, the omentums need to be replaced. Also check the condition of the propeller: chips and bullies on the blades cause vibrations that destroy the bearings of lower unit.
Use only specialized oil for outboard gearboxes (usually labeled as Gear Oil). Automotive transmission oils may contain additives harmful to the non-ferrous metals from which gear gears are made.
Typical malfunctions and methods of their elimination
In the process of operation, the owner may face a number of standard problems, knowing the causes of which allows you to quickly return the equipment to operation without using the service.
The engine starts and then it stops, and most of the time it's caused by the fuel system, see if it's full. idle-jack Or the sludge filter in the fuel pear, and the problem could be the air suction through the gasket between the carburetor and the engine.
The engine doesn't develop full speed. This can be caused by contamination of the exhaust windows with soot (especially if you worked long on singles), improper adjustment of the carburetor or a speed limiter (if it is installed structurally), also check whether the "beard" of algae has grown on lower unit.
⚠️ Attention: Never attempt to remove the speed limit by drilling the throttle limiter without reconfiguring the carburetor accordingly, which will result in the operation of the dipped mixture and the piston group quickly fails.
If the engine smokes more than usual, check the proportion of the mixture. Excess oil in gasoline is the most common cause of blue smoke. If the proportion is correct, perhaps worn out oil rings or piston rings are buried.
What to do if the engine is “suffocated”?
If air enters the fuel system, the pear stops pumping. Find a fuel filter, unscrew the feed hose to the carburetor and blow it (carefully!) to push the fuel through. Or just wait 5-10 minutes for the air to come out by itself through the tank's sapuna.
Preparation for winter storage
Proper preservation of the engine for the winter is the guarantee that the spring it will start the first time, the main danger is corrosion inside the carburetor and cylinders from residues of fuel and moisture.
You have to extract all the gasoline from the carburetor, and you can shut off the faucet and let the engine run the fuel from the float chamber until it stops, and then you have to put the fuel stabilizer in the tank and let the engine run for a couple of minutes to get the mixture inside.
- ❄️ Pour water from the cooling system (overturning the motor or blowing air) so that when it freezes it does not tear the cooling shirt.
- ❄️ Treat the outer metal surfaces with a lubricant spray to protect against moisture.
- ❄️ Keep the motor upright in a dry room.
Compliance with these simple rules will allow your "Yamer" to serve faithfully for many seasons, delighting with stable traction and economy.
Which oil is best used for the mixture?
Use only quality two-stroke oils with labeling TC-W3Mineral oils are cheaper, but they provide more soda and require more frequent candle replacement. Semi-synthetics or synthetics (e.g. Motul, Ravenol, Liqui Moly) provide better lubrication and engine purity, especially at high loads.
Why does the engine stop on idle after heating up?
Most likely, the maladjustment of the screw quality of the mixture (L) or clogged the channel of idling in the carburetor, also the cause may be the sucking of excess air through the crankshaft oal or the gasket of the intake petal valve.
Can I use 95th gasoline?
Yamer engines are designed for AI-92 gasoline, but the use of AI-95 is permissible and even preferable, since it is less prone to detonation, the main thing is not to use gasoline with an expired shelf life (older than 1-2 months), as it loses its octane number and forms resins.