Domestically produced B-series outboard motors remain popular among small-sized swimmers because of their simplicity and availability. Despite the emergence of many modern Chinese counterparts, many anglers and hunters prefer to use time-tested equipment that is easily repairable in the field. B2 It is a two-stroke unit designed for installation on small PVC boats or metal hulls with a transom height of up to 350 mm.
The operation of this model requires an understanding of the specifics of two-stroke engines, in particular, the correct preparation of the fuel mixture and regular maintenance of the units. Unlike more complex foreign analogues, here the design is as simplified as possible, which allows you to produce a fuel mixture. hand-craft However, to ensure the durability of the unit, you need to strictly observe the routine work and take into account the peculiarities of the ignition system.
In this article, we will discuss in detail the technical specifications, typical malfunctions and methods of their elimination, we will pay special attention to the setting of the carburetor and the rules of running, since these are the stages that most often cause questions for beginners. crank-and-wheeler It will help you avoid serious damage at the most inopportune time.
Technical specifications and design features
The B2 is designed as a lightweight and maneuverable unit capable of developing sufficient power to move a boat with one or two passengers. two-stroke The cylinders have a displacement of 48 cubic centimeters, which, when properly adjusted, can take about 2 horsepower off. The engine weight in running order is less than 9.8 kg, making it a burden to transport and install on a transom.
The cooling system here is open-source: water is drawn through special holes in the lower unit, and the discharge is carried out with the exhaust gases, which is effective, but requires caution when working at low speeds or on land. Water intake It can be clogged with algae or sand, so visual control of the water jet from the control hole is mandatory before each release to the water.
⚠️ Warning: Never start the motor out of water or without providing forced cooling, as overheating of the piston group occurs in a matter of seconds and leads to a jamming.
The engine transmission is equipped with a reverse gear that allows you to switch between the front, neutral and reverse. Control is carried out by a tiller, which also contains the handle of the gas and the stop button. propeller a certain diameter and step, the replacement of which is possible in case of damage or to change the traction specifications.
Rules of running and preparation of fuel mixture
The durability of any two-stroke engine depends on the quality of the break-in, and a new engine or unit after major repairs requires a period of laundry of rubbing parts. piston-ring They must fit evenly against the cylinder walls to form the necessary compression, and neglecting this step often leads to increased fuel consumption, smoke and power loss in the future.
The process of running in water should take place, as the work "dry" or on the stand does not give a complete picture of the load. It is recommended to develop at least 10 tanks of the fuel mixture in a gentle mode. Engine turnover should not exceed 50-60% of the maximum, and the load should be increased gradually.
The Bi 2 uses a mixture of AI-92 (or AI-95) gasoline and a special two-stroke oil, the mixing ratio is usually 1:25 or 1:50 depending on the type of oil used and the manufacturer's recommendations. fuel-system.
☑️ Rules for successful breaking in
Use only quality oils designed specifically for two-stroke air-cooled or water-cooled engines. Use of used oils or products that do not meet the specification will lead to the formation of a deposit on the body. spark-plug And in the exhaust channel, which will make it very difficult to start.
Device and configuration of the carburetor
The carburetor is the heart of the fuel system, responsible for preparing a combustible mixture of the desired consistency. The B series usually installs simple float carburetors that are easily adjustable. float-chamberThe main fuel jigsaw and the idling system, and understanding their interactions is essential to diagnosing traction problems.
The adjustment is made by rotating the adjusting screws of quality and quantity of mixture. When properly set up, the engine must be stable at idling speed and quickly gain power when the throttle is opened sharply. If the motor sneezes or stalls when the gas is added, it indicates too much. poor-mixIt's dangerous to overheat.
⚠️ Warning: Working on a diluted mixture (lots of air, little gasoline) causes local overheating of the piston and can lead to its burning or melting.
To access the control elements, partial disassembly of the unit is often required. Before starting work, make sure that the fuel channels are clean and there is no water in the float chamber. Adjusting the fuel level in the chamber also affects the stability of operation; too high a level will lead to overruns and black smoke from the exhaust.
Secrets to cleaning jellycleres
To clean the calibrated jelly jelly jelly vents, use soft copper wire or a special spray cleaner. Using steel needles can widen the hole and disrupt calibration, making the carburetor unsuitable for fine tuning.
Ignition system and electrician
The reliability of the start of the B2 engine depends largely on the serviceability of the ignition system. magdin (magneto) with a switch-on or electronic ignition system (in more modern versions), the main element requiring periodic monitoring is the spark plug, the color of the coar on the electrodes can be judged on the quality of combustion of the mixture and the general condition of the engine.
The gap between the contacts of the interrupter must be strictly defined by the technical regulation (usually 0.3-0.4 mm). Too large a gap will lead to a slight spark formation at high speeds, and too small - to rapid burning of the contacts and unstable idling.
The capacitor in the ignition system is used to quench the spark in the contacts of the interrupter and increase the voltage in the secondary coil. The capacitor failure is a common cause of the disappearance of the spark, and you can check it with an ohmmeter or replace it with a known serviceable one. High-voltage wire It should also be whole, without insulation cracks through which current leakage can occur.
Typical malfunctions and methods of their elimination
During operation, the outboard motor can face a number of typical problems, most of which can be solved independently, knowledge of the main symptoms and causes allows you to quickly return the equipment to operation.
| Malfunction | Possible cause | Elimination method |
|---|---|---|
| The engine won't start. | Lack of spark, gillard clog | Check the candle, clean the carburetor |
| Engine's dead on singles. | Air suction, mud in the XX system | Check the tightness, adjust the screw quality |
| Vibration is strong. | Damage to the propeller, imbalance | Replace the screw, check for lower unit |
| Overheating of the hull | Clogged water intake, poor mix | Clean the channels, enrich the mixture |
One of the common problems is the loss of leakage of fuel hoses and coils. Air entering the system leads to impoverishment of the mixture and jerks in operation. Visual inspection of all connections and replacement of worn rubber elements help to avoid this situation. fuel-pump membranesIf it is provided by the design.
If the engine is not turning enough, the cause may be coking the exhaust channels with soot. In two-stroke engines, this is an inevitable process that requires periodic mechanical or chemical cleaning. The use of quality oil significantly reduces the rate of formation of sediments.
To prevent coking, add a little special injector and carburetor cleaner to the fuel mixture before long-term storage or after active use.
Care, conservation and storage
Properly storing the engine during the off-season extends its life for years, and once the navigation is over, you need to fully develop the fuel mixture from the carburetor to prevent the evaporation of light fractions and the formation of resinous deposits, and to do this, the engine is jammed, blocking the fuel supply, and let it work until it stops.
External metal surfaces, especially lower unit, should be cleaned of salt, silt and rust, then greased with conservation grease. The propeller It is recommended to remove, clean from winding fishing lines (which can damage the glands) and lubricate the shaft with solidol.
Keep the engine is best in a vertical position (on lower unit) or horizontally on a special stand so that water does not leak into the exhaust system. The room should be dry and ventilated. Before the new season, be sure to check the oil level in the redctor (if any) and the condition of the candle.
⚠️ Warning: Do not leave the engine with a full tank of gasoline in the heat when stored, as evaporation can create excessive pressure in the tank and damage the fuel hoses.
Regular prevention and proper preservation are more important than expensive repairs. Give 30 minutes of maintenance after each fishing trip and the engine will last for decades.
FAQ: Frequently asked questions
Which gasoline is best used for the B2 engine?
The optimal choice is gasoline brand AI-92 with an octane number not lower than 92. the use of AI-95 is allowed, but does not give significant advantages, and in some cases (in the presence of alcohol additives) can be harmful to rubber elements of the carburetor.
How often should you change the oil in the gearbox?
In outboard motors of type B2, the oil in the gearbox changes rarely, usually once a season or when water (emulsion) is detected in the oil.
Why does the engine smoke blue smoke?
Blue smoke is a sign of oil burning. If the smoke is moderate and disappears after warming up, this is normal for a two-stroke. Dense blue smoke may indicate a misalignment of the mixture (too much oil) or wear of piston rings.
Can I use the B2 engine in salt water?
Use is possible, but requires thorough freshwater washing after each outlet: Aluminum alloys and steel are prone to corrosion in a salty environment, so neglecting washing will quickly lead to parts breaking down.