Getting your Stihl MS250 chainsaw up and running requires a blend of preparation, careful procedure, and an understanding of the machine’s fundamentals. This guide walks you through every step of the Stihl MS250 starting instructions, ensuring you can start your tool confidently and safely. Before you even touch the starter, it is essential to prepare the chainsaw correctly to avoid damage and ensure a smooth, reliable start every time.
Preparing the Stihl MS250 for Startup
Preparation is the foundation of a successful start. A poorly prepared chainsaw can lead to difficult starts or even safety hazards. Begin by placing the MS250 on a stable, level surface, away from any flammable materials. Engage the chain brake by pulling the handguard forward; this locks the chain in place and prevents accidental movement during the starting process. Next, confirm that the fuel tank is filled with the correct mixture of high-quality two-stroke oil and gasoline, as specified in your owner’s manual. Finally, check that the air filter is clean and seated properly, as a clogged filter restricts airflow and makes starting significantly harder.
Understanding the Controls and Safety Features
The Stihl MS250 is designed with intuitive controls, but knowing their function is vital for a safe start. Locate the master control lever, which is typically positioned near the rear handle. This lever has three positions: the "0" position is the stop setting, the "1" position is the starting position, and the "2" or "I" position is the running position. Before pulling the starter cord, ensure the throttle is in the idle position, which usually requires you to hold the throttle trigger lock while moving the master lever to "1". Familiarize yourself with the chain brake and the stop switch to ensure you can quickly and safely shut down the tool if necessary.
Step-by-Step Manual Starting Procedure
With the MS250 prepared and controls understood, you are ready to start the engine. Follow these steps methodically for a reliable startup:
Set the master control lever to the "2" or "I" position and let it return to the "0" stop position.
Press the primer bulb located on the carburetor cover several times until you see fuel appear in it. This action primes the engine with fuel.
Move the master control lever to the "1" start position.
Secure the chainsaw firmly between your legs, ensuring the chain brake is engaged and the bar is clear of any obstructions.
Grasp the starter handle firmly and pull the cord smoothly and decisively until the engine fires.
Troubleshooting a Cold Start
Starting a cold engine, especially in cooler weather, can require a slightly different approach. If the engine resists starting, you might need to adjust the choke. On the Stihl MS250, this is often integrated into the master control lever. If the engine floods or fails to catch, move the lever to the "0" position, wait a few moments for the excess fuel to clear, and then restart the priming and starting process. Patience and avoiding repeated, rapid pulls of the starter cord are key to resolving cold start issues.
Starting with the Decompression Valve
For easier pulling, particularly on a warm or hot engine, the Stihl MS250 features a decompression valve. This valve reduces the compression in the cylinder, making the starter cord much easier to pull. To use it, locate the valve knob on the side of the engine, usually near the spark plug. Briefly pull the knob out to the "open" position, perform your starting pulls, and then push the knob back in firmly to close the valve before the engine fires. This action ensures the engine starts under the correct compression for a smooth, immediate run.
