Stihl MM 56 C-E Yard Boss Instruction Manual
![Stihl MM 56 C-E Yard Boss manual cover](/images/6e60ff0e73861712488c5725/thumbs/thumb175x175.webp)
To start the Stihl MM 56 C-E, ensure the machine is on a flat surface. Set the choke lever to the cold start position, press the fuel pump bulb several times until fuel is visible, and then pull the starter grip until the engine fires. Move the choke lever to the run position and pull the starter grip again to start the engine.
The Stihl MM 56 C-E requires a mixture of 89 octane or higher gasoline and Stihl 2-cycle engine oil at a 50:1 ratio. Always use fresh fuel to ensure optimal performance.
The air filter should be checked and cleaned after every 25 hours of operation or more frequently if you are working in dusty conditions. Replace the filter if it's damaged or excessively dirty.
If the engine is flooding, move the choke lever to the run position and pull the starter grip several times to clear excess fuel. If the engine does not start, remove the spark plug, dry it, and then try starting the engine again.
Regularly inspect the tines for wear and damage. Clean them after each use to prevent soil buildup. Replace the tines if they are worn down or damaged to ensure efficient operation.
To store the Yard Boss, clean it thoroughly and remove any debris. Drain the fuel tank and run the engine until it stops. Store the machine in a dry, well-ventilated place away from direct sunlight.
If the engine starts but does not stay running, check the fuel mixture, clean the air filter, and inspect the spark plug for wear or fouling. Adjust the idle speed screw if necessary, and ensure the fuel lines are not clogged.
Always wear appropriate protective gear, including gloves, eye protection, and sturdy footwear. Keep bystanders and pets away from the work area. Be aware of your surroundings and avoid operating the machine on steep slopes.
To change the spark plug, first disconnect the spark plug boot. Use a spark plug wrench to remove the old spark plug. Check the gap on the new spark plug and adjust if necessary, then install it and reconnect the spark plug boot.
Excessive vibration may be caused by damaged or unbalanced tines. Inspect the tines and replace them if necessary. Tighten any loose components and ensure that the machine is assembled correctly.