The STIHL MS 251 chainsaw is a dependable tool known for its power and reliability. Whether you’re a seasoned user or a newcomer to chainsaw operation, it’s crucial to understand the correct steps for starting this powerful machine safely and efficiently. In this article, we will provide clear and concise technical details on how to start a STIHL MS 251 chainsaw.
1. Safety First
Before starting the chainsaw, ensure you’re wearing the appropriate safety gear:
- Safety glasses or goggles to protect your eyes from flying debris.
- Ear protection to safeguard your hearing.
- Gloves for a secure grip and hand protection.
- Chainsaw chaps or pants to shield your legs from cuts.
- Steel-toed boots for foot protection.
2. Fuel and Oil
Ensure you have the correct fuel and chain oil:
- Use fresh, high-quality gasoline with an octane rating of at least 89.
- Mix the gasoline with STIHL two-stroke engine oil at a 50:1 ratio.
- Use STIHL chain oil to lubricate the chain during operation.
3. Chain Brake
Always engage the chain brake before starting the chainsaw. The chain brake is a safety feature that prevents the chain from spinning when the saw is idling. To engage it, push the front handguard forward.
4. Cold Start Procedure
For a cold start, follow these steps:
- Set the master control lever to the cold start position (marked with a snowflake symbol).
- Push the decompression valve, if your chainsaw has one.
- Press the fuel pump bulb several times until it’s full.
- Place the chainsaw on a flat, stable surface.
- Insert the chain brake lever into the rearward position (disengaged).
- Grasp the front handle with your left hand and hold the rear handle with your right hand.
- Place your foot through the rear handle for stability.
- Pull the starter grip firmly and smoothly until you feel resistance, then give it a brisk, strong pull.
- After a few pulls, the engine will fire. When it does, push the choke control to the off position.
5. Warm Start Procedure
If the chainsaw is already warm, follow these steps:
- Set the master control lever to the warm start position (marked with a sun symbol).
- Ensure the chain brake is engaged.
- Insert the chain brake lever into the rearward position (disengaged).
- Grasp the front handle with your left hand and hold the rear handle with your right hand.
- Place your foot through the rear handle for stability.
- Pull the starter grip firmly and smoothly until the engine starts.
6. Operating the Chainsaw
Once the chainsaw is running, release the chain brake by pushing the lever forward. Be ready to use the chainsaw safely and maintain a firm grip on the handles.
7. Additional Safety Tips
- Always operate the chainsaw with both hands.
- Maintain a safe distance from bystanders and objects.
- Keep the chain well-lubricated with chain oil during use.
- Regularly inspect and maintain your chainsaw to ensure it operates safely and effectively.
Conclusion
Starting a STIHL MS 251 chainsaw safely and efficiently is essential for both new and experienced users. By following these clear and concise technical details and prioritizing safety, you can confidently use this powerful tool for various cutting tasks.