Stihl MM 55 Yard Boss Instruction Manual

Pages 68

Year 2016

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Stihl MM 55 Yard Boss Specification

The Stihl MM 55 Yard Boss is a versatile multi-task gardening tool designed for a variety of landscaping applications. At the core of its performance is a reliable 27.2 cc 2-stroke engine, engineered for optimal fuel efficiency and power output. This engine offers a balance of performance and ease of use, facilitating smooth operation across its various attachments. Weighing approximately 9.8 kg without attachments, the MM 55 is built to be manageable and ergonomic, ensuring user comfort during extended use. The device features a multi-function control handle, providing users with easy access to all controls, enhancing safety and convenience.

The Yard Boss is equipped with a quick-release coupling system, allowing for swift and tool-free attachment changes. This adaptability enables the MM 55 to perform a diverse range of tasks, including soil cultivation, lawn aeration, and sweep operations. The tool's compact design supports maneuverability in tight spaces, making it suitable for both residential and professional landscaping needs.

Its smart design incorporates a folding handlebar, facilitating compact storage and transport. The 'Easy2Start' system reduces the effort required to start the engine, optimizing the user experience. Additionally, the device's low-emission technology aligns with environmental standards, minimizing its ecological footprint while maintaining robust performance. The Stihl MM 55 Yard Boss stands out as a multifunctional tool that combines efficiency, versatility, and ease of use for a comprehensive range of yard maintenance tasks.

Stihl MM 55 Yard Boss F.A.Q.

How do I start my Stihl MM 55 Yard Boss?

To start your Stihl MM 55 Yard Boss, first ensure the machine is on a flat surface. Set the choke to the closed position, press the fuel pump bulb at least five times, and set the throttle trigger to the start position. Pull the starter cord firmly until the engine fires. Once it starts, open the choke gradually.

What type of fuel should I use for my Stihl MM 55 Yard Boss?

Use a high-quality 89 octane unleaded gasoline mixed with a 2-cycle engine oil at a ratio of 50:1. Stihl recommends using their branded oil for optimal performance and longevity. Avoid using fuel with more than 10% ethanol content.

How do I maintain the air filter on my Yard Boss?

Regularly inspect the air filter and clean it if necessary. To clean, remove the air filter cover, take out the filter, and wash it with warm soapy water. Let it dry completely before reinstalling. Replace the filter if it is damaged or excessively dirty.

What should I do if my MM 55 won't start?

If your MM 55 won't start, check the fuel levels and ensure the fuel is fresh. Inspect the spark plug for damage or wear, and replace if necessary. Ensure the air filter is clean and not clogged. Also, verify that the choke is set correctly during starting.

How do I adjust the carburetor on the Stihl MM 55?

To adjust the carburetor, locate the adjustment screws on the carburetor body. Use a screwdriver to adjust the idle speed screw (LA) for correct idle speed. It's advised to consult the user manual or a professional for precise tuning and to avoid engine damage.

Can I use attachments with the Stihl MM 55 Yard Boss?

Yes, the Stihl MM 55 Yard Boss is compatible with various attachments such as a cultivator, edger, and dethatcher. Ensure each attachment is securely fastened before use and consult the manual for specific instructions for each attachment.

How often should I change the spark plug on my MM 55?

It's recommended to inspect the spark plug every 25 hours of operation and replace it annually or as needed. Use a spark plug with a gap setting of 0.020 inches (0.5 mm) as specified by the manufacturer.

What safety precautions should I take while using the Yard Boss?

Always wear protective gear such as gloves, eye protection, and sturdy footwear. Ensure the area is clear of debris and people before starting. Keep hands and feet away from moving parts, and never operate the machine under the influence of drugs or alcohol.

How do I store the Stihl MM 55 for the winter?

To store the MM 55 for winter, drain the fuel tank and run the engine until it stops to clear the carburetor. Clean the machine thoroughly, inspect for any damage, and store it in a dry, secure location. Consider removing the spark plug and adding a few drops of oil in the cylinder to prevent rust.

What should I do if the Yard Boss vibrates excessively during operation?

Excessive vibration may be due to loose parts or damaged attachments. Check that all screws and bolts are tight, and inspect attachments for signs of wear or damage. If the problem persists, it may require professional servicing.