MAINTENANCE

Fine adjustment of the idle speed T

Adjust the idle speed using the idle adjustment screw T, if it is necessary to readjust. First turn the idle adjustment screw T clockwise until the cutting attachment starts to rotate. Then turn the screw anticlockwise until the cutting attachment stops. The idle speed is correctly adjusted when the engine will run smoothly in every position. The idle speed should also be well below the speed at which the cutting attachment starts to rotate.

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.

High speed jet H

Note that the engine should not be under load when you adjust the high speed jet H. You should therefore remove the cutting attachment, nut, support flange and drive disc before adjusting the high speed jet H. The high speed jet H affects the engine power, speed, temperature and fuel consumption. If the high speed jet H is set too lean (screwed in too far) the engine speed will be too high and cause engine damage. Do not let the engine run at full speed for more than 10 seconds.

Apply full throttle and turn the high speed jet H very slowly clockwise until the engine slows down. Then turn the high speed jet H very slowly anticlockwise until the engine starts to run unevenly. Now turn the high speed jet H slowly clockwise a little way until the engine runs smoothly.

The high speed jet H is adjusted correctly when the machine burbles a little. If the machine races then the setting is too lean. If the engine produces a lot of smoke and burbles a lot then the setting is too rich.

H

CAUTION! For optimum adjustment of the carburettor, contact a qualified dealer/service workshop that has a revolution counter at their disposal.

Correctly adjusted carburetor

When the carburetor is correctly adjusted the machine will accelerate without hesitation and burble a little at maximum speed. It is also important that the cutting attachment does not rotate at idle. If the low speed jet L is set too lean it may cause starting difficulties and poor acceleration.

If the high speed jet H is set too lean it will result in less power, less performance, poor acceleration and/or damage to the engine.

If both the L and H jets are set too rich it will results in acceleration problems or too low a working speed.

Adjusting the start throttle speed

The correct start throttle speed is set by means of an adjuster on the rear of the handle next to the cable. Use this screw (4

mmAllen screw) to increase or decrease the start throttle speed.

5 mm

Proceed as follows:

1Run the machine at idle.

2Press the start throttle lock as described under the heading Starting and stopping.

3If the start throttle speed is too low (below 4000 rpm), turn the adjuster screw A clockwise until the cutting attachment starts to rotate. Then turn A clockwise a further 1/2 turn.

4If the start throttle speed is too high, turn the adjuster screw A anticlockwise until the cutting attachment stops. Then turn adjuster screw A clockwise a further 1/2 turn.

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.

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Jonsered BC 2125 manual Fine adjustment of the idle speed T, High speed jet H, Correctly adjusted 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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