Stihl BT 121 Instruction Manual

Stihl BT 121 manual cover
Pages 66
Year 2006
Language(s)
English en
Spanish sp

Stihl BT 121 Specification

The Stihl BT 121 is a robust and reliable earth auger designed for demanding drilling tasks. It features a powerful 1.3 kW (1.75 hp) single-cylinder two-stroke engine, providing efficient performance and consistent power output. The engine displacement is 30.8 cc, which ensures the machine can handle tough soil conditions with ease. Weighing approximately 9.9 kg, the BT 121 is engineered for ease of use and maneuverability, making it suitable for various applications such as fence post installation, planting, and soil sampling.

The auger is equipped with an advanced vibration dampening system, enhancing user comfort during prolonged use by significantly reducing operator fatigue. The ergonomic design includes a comfortable, large handle and an easy-to-reach throttle trigger for precise control and operation. The Stihl BT 121 also features a centrifugal clutch that facilitates smooth acceleration and auger bit engagement, ensuring optimal performance and safety.

The fuel tank capacity of 0.53 liters allows for extended operation between refueling, while the translucent tank design provides easy monitoring of fuel levels. The gear reduction ratio of 47:1 ensures optimal torque delivery and efficient drilling performance. Compatible with a range of auger bits, the BT 121 can accommodate various project requirements, offering versatility and adaptability in different working environments.

In terms of maintenance, the BT 121 is designed for easy serviceability with accessible engine components and a straightforward air filter system that ensures prolonged engine life. Overall, the Stihl BT 121 is a durable, high-performance earth auger ideal for professionals and serious DIY enthusiasts who require reliability and efficiency in their drilling equipment.

Stihl BT 121 F.A.Q.

How do I start the Stihl BT 121 auger?

To start the Stihl BT 121, ensure the fuel tank is filled, set the choke lever to the cold start position, press the decompression valve, and pull the starter rope until the engine fires. Then, move the choke to the run position and pull the starter rope again to start the engine.

What type of fuel should I use for my Stihl BT 121?

Use a high-quality 2-stroke engine oil with a gasoline-oil ratio of 50:1. Always use fresh, unleaded gasoline with a minimum octane rating of 89.

Why won't my Stihl BT 121 auger start?

If the auger won't start, check the fuel level, ensure the choke is set correctly, inspect the spark plug for wear or fouling, and verify that the air filter is clean.

How do I maintain the air filter on the Stihl BT 121?

To maintain the air filter, remove it regularly and clean it with warm, soapy water. Rinse thoroughly and allow it to dry completely before reinstalling. Replace the filter if it is damaged or excessively dirty.

What should I do if my Stihl BT 121 is vibrating excessively?

Excessive vibration may be caused by loose parts or an imbalanced auger bit. Check all screws and mounts for tightness and inspect the auger bit for damage or wear.

How often should I perform maintenance on the Stihl BT 121?

Regular maintenance should be performed every 10 hours of operation, including checking the spark plug, cleaning the air filter, and inspecting the fuel system. A more comprehensive check should be done every 50 hours.

Can I use the Stihl BT 121 in cold weather?

Yes, the Stihl BT 121 can be used in cold weather. However, ensure the engine is properly warmed up before operation and use winter-grade fuel if required.

How do I sharpen the auger bit on the Stihl BT 121?

To sharpen the auger bit, secure it in a vice and use a flat file to sharpen the cutting edges. Follow the original angle and ensure all edges are evenly sharpened.

What safety precautions should I follow when using the Stihl BT 121?

Wear appropriate safety gear, including gloves, safety goggles, and hearing protection. Ensure the work area is clear of obstacles, and never operate the auger near flammable materials.

How do I store the Stihl BT 121 when not in use?

Drain the fuel tank, clean the machine thoroughly, and store it in a dry, well-ventilated area. Protect the auger bit with a cover to prevent rust and damage.