MAINTENANCE

Carburetor

Your Jonsered product has been designed and manufactured to specifications that reduce harmful exhaust fumes. The engine will be run in after it has used 8-10 tanks of fuel. To ensure that the engine runs at peak performance and produces as little harmful exhaust fumes as possible after the running-in period, ask your dealer/service workshop (which has a rev counter for this purpose) to adjust your carburettor.

WARNING! The complete clutch cover and

!shaft must be fitted before the machine is started, otherwise the clutch can come loose and cause personal injury.

Function

•The carburetor governs the engine’s speed via the throttle control. Air and fuel are mixed in the carburetor. The air/ fuel mixture is adjustable. Correct adjustment is essential to get the best performance from the machine.

•The setting of the carburetor means that the engine is adapted to local conditions, for example, the climate, altitude, fuel and the type of 2-stroke oil.

•The carburetor has three adjustment controls: L = Low speed jet

H = High speed jet

T = Idle adjustment screw

•The L and H-jets are used to adjust the supply of fuel to match the rate that air is admitted, which is controlled with the throttle. If they are screwed clockwise the air/fuel ratio becomes leaner (less fuel) and if they are turned anti- clockwise the ratio becomes richer (more fuel). A lean mixture gives a higher engine speed and a rich mixture gives a lower engine speed.

•The T-screw regulates the throttle setting at idle speed. If the T-screw is turned clockwise this gives a higher idle speed; turning it anti-clockwise gives a lower idle speed.

Basic setting

•The basic carburetor settings are adjusted during testing at the factory. The basic setting is richer than the optimal setting and should be maintained for the first few hours the machine is in use. The carburettor should then be finely adjusted. Fine adjustment should be carried out by a skilled technician.

CAUTION! If the cutting attachment rotates when the engine is idling the idle adjustment screw T should be turned anti- clockwise until the cutting attachment stops.

Rec. idle speed 2700 rpm

Recommended max. speed: See the Technical data section.

WARNING! If the idle speed cannot be

!adjusted so that the cutting attachment stops, contact your dealer/service workshop. Do not use the machine until it has been correctly adjusted or repaired.

Fine adjustment

•When the machine has been ”run-in” the carburetor should be finely adjusted. The fine adjustment should be carried out by a qualified person. First adjust the L- jet, then the idling screw T and then the H-jet.

Conditions

•Before any adjustments are made, make sure that the air filter is clean and the air filter cover is fitted. If you adjust the carburettor when the air filter is dirty it will result in a leaner mixture when the filter is finally cleaned. This can lead to serious engine damage.

•Carefully turn both jets, L and H, so that they are midway between fully screwed in and fully screwed out.

•Do not attempt to adjust the L and H jets beyond either stop as this could cause damage.

•Now start the machine according to the starting instructions and let it warm up for 10 minutes.

CAUTION! If the cutting attachment rotates when the engine is idling the idle adjustment screw T should be turned anti- clockwise until the cutting attachment stops.

Low speed jet L

•Try to find the highest idling speed, turning the low speed needle L clockwise respectively counter-clockwise. When the highest speed has been found, turn the low speed needle L 1/4 turn counter-clockwise.

+ 1/4

L

CAUTION! If the cutting attachment rotates when the engine is idling the idle adjustment screw T should be turned anti- clockwise until the cutting attachment stops.

24 – English

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Jonsered BC 2125 manual Maintenance, Carburetor
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BC 2125 specifications

The Jonsered BC 2125 is a powerful and versatile brush cutter designed for both professional landscapers and dedicated homeowners. It combines performance, durability, and user-friendly features, making it an excellent choice for tackling tough vegetation and maintaining outdoor spaces.

One of the standout features of the BC 2125 is its robust engine. Powered by a high-performance, air-cooled two-stroke engine, this brush cutter delivers an impressive combination of power and efficiency. The engine is designed to provide the necessary torque for cutting through thick brush and weeds, ensuring that users can tackle even the most challenging tasks with ease.

The BC 2125 comes equipped with an innovative Easy Start system, which significantly reduces the effort required to start the machine. This technology minimizes pull resistance, allowing users to get to work quickly without the frustration often associated with starting larger outdoor power equipment.

Safety is also a priority with the Jonsered BC 2125. It features a professional-grade harness that distributes weight evenly across the body, enhancing comfort during prolonged use. The anti-vibration system further reduces the strain on the operator, allowing for extended periods of operation without excess fatigue.

In addition to its powerful performance, the BC 2125 offers versatility through its interchangeable cutting heads. Users can opt for a variety of attachments, including grass trimmers, brush cutting blades, and even pole saws, making it suitable for a wide range of tasks. This adaptability ensures that the machine can be customized to meet specific needs, whether it's trimming grass around garden edges or clearing dense underbrush.

The design of the BC 2125 emphasizes user convenience. The adjustable handle not only improves ergonomics but also allows for precise control, particularly when navigating uneven terrain. The machine’s lightweight construction makes it easy to maneuver, reducing operator fatigue during long tasks.

In conclusion, the Jonsered BC 2125 is a reliable and efficient brush cutter that combines innovative technology and design to provide exceptional performance. With its powerful engine, Easy Start system, safety features, and versatility, this machine is ideal for anyone seeking a dependable solution for maintaining their outdoor spaces. Whether for professional or personal use, the BC 2125 is a strong contender in the realm of brush cutters, offering the reliability and functionality users expect from the Jonsered brand.
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