How to port a chainsaw part 3: How to choose your timing numbers!! (echo CS-670)

Introduction

This tutorial is designed to guide you through the process of choosing timing numbers for your Echo CS-670 chainsaw. Understanding timing numbers is crucial for optimizing your chainsaw’s performance, ensuring that the engine runs efficiently and effectively.

Step 1: Understanding Timing Numbers

Timing numbers refer to the measurements that determine when the intake and exhaust ports open and close in relation to the piston’s position. Here’s what you need to know:

• Importance of Timing: Proper timing affects power, torque, and fuel efficiency.
• Types of Timing:
  • Intake Timing: When the intake port opens and closes.
  • Exhaust Timing: When the exhaust port opens and closes.

Practical Tips

• Familiarize yourself with your chainsaw's specifications for optimal performance.
• Consider how changes in timing can affect power delivery and responsiveness.

Step 2: Choosing the Right Timing Numbers

Selecting the correct timing numbers can vary based on your specific needs. Here’s how to choose:

1. Identify Your Purpose:

   • Are you looking for maximum power?
   • Do you want better fuel efficiency?

2. Adjusting Timing:

   • If you want more power, you may choose to advance the timing numbers.
   • For better fuel economy, consider retarding the timing slightly.

3. Consult Manufacturer Guidelines:

   • Check the Echo CS-670 manual for recommended timing settings.
   • Compare with other modified chainsaw examples for insights.

Common Pitfalls to Avoid

• Avoid making drastic timing changes without understanding the implications.
• Be cautious of the balance between power and efficiency; too much power can lead to increased fuel consumption.

Step 3: Testing Your Changes

After adjusting your timing numbers, it’s crucial to test the performance of your chainsaw:

1. Conduct a Performance Test:

   • Start the chainsaw and observe its behavior.
   • Check for smooth acceleration and consistent power delivery.

2. Monitor Fuel Consumption:

   • Keep track of how much fuel the chainsaw uses during operation.
   • Adjust timing numbers again if necessary based on performance feedback.

Real-World Application

• Regularly test and adjust timing as you use your chainsaw for different tasks, such as cutting different types of wood or varying operational conditions.

Conclusion

Choosing the right timing numbers for your Echo CS-670 chainsaw can significantly enhance its performance. By understanding the mechanics behind timing, selecting appropriate numbers based on your needs, and testing the results, you can ensure your chainsaw operates at its best. Don’t hesitate to revisit and refine your settings as you gain experience and insights. Happy cutting!