Stihl MS 661 Instruction Manual

Stihl MS 661 manual cover
Pages 148
Year 2020
Language(s)
English en
Spanish sp

Stihl MS 661 Specification

The Stihl MS 661 is a high-performance chainsaw engineered for professional forestry and heavy-duty applications. It features a robust 91.1 cc two-stroke engine, delivering powerful output while maintaining efficiency. The chainsaw is designed with an emphasis on durability and reliability, making it suitable for felling large trees and cutting dense timber. The unit incorporates Stihl's advanced pre-separation air filtration system, which extends filter life and enhances engine longevity by reducing debris intake.

To ensure user comfort during extended use, the MS 661 is equipped with an anti-vibration system that minimizes operator fatigue. The ergonomic design includes a well-balanced weight distribution and an easy-to-grip handle, facilitating precise control and maneuverability. Starting the chainsaw is made straightforward by the inclusion of Stihl's ElastoStart technology, which reduces the effort needed by absorbing compression shock. The decompression valve further aids in smooth starting by venting the combustion chamber.

Safety is paramount in the MS 661, with features like the inertia-activated chain brake that stops the chain in the event of a kickback, and a throttle lockout mechanism to prevent accidental acceleration. The chainsaw's fuel and oil caps are designed for quick, tool-free access, ensuring efficient refueling and maintenance. Additionally, the MS 661 supports a range of bar lengths, allowing users to customize it based on their specific cutting requirements.

Overall, the Stihl MS 661 combines power, reliability, and user-centric design, making it an ideal choice for professionals seeking a high-capacity chainsaw for demanding tasks. It exemplifies Stihl's commitment to quality and performance in professional-grade forestry equipment.

Stihl MS 661 F.A.Q.

What is the recommended fuel mixture for the Stihl MS 661?

The recommended fuel mixture for the Stihl MS 661 is 50:1, which means 50 parts gasoline to 1 part Stihl two-stroke engine oil.

How do I clean the air filter on my Stihl MS 661?

To clean the air filter, first remove the filter cover. Take out the air filter and wash it in warm soapy water. Rinse thoroughly and let it dry completely before reinstallation.

What should I do if my Stihl MS 661 is hard to start?

Check the spark plug for wear or damage, ensure that the fuel is fresh, and inspect the air filter for clogs. If these are fine, it may require a carburetor adjustment.

How often should I sharpen the chain on my Stihl MS 661?

Sharpen the chain whenever you notice it cutting less effectively. For regular use, sharpening after every few hours of operation is typically recommended.

What is the correct procedure for tensioning the chain on a Stihl MS 661?

To tension the chain, loosen the bar nuts slightly. Use the tensioning screw to adjust the chain until it fits snugly against the bar but can still move freely. Tighten the bar nuts securely after adjustment.

How do I perform regular maintenance on the Stihl MS 661?

Regular maintenance includes checking and cleaning the air filter, inspecting and cleaning the spark plug, sharpening the chain, and ensuring proper chain tension. Also, inspect the fuel and oil levels before each use.

Why does my Stihl MS 661 keep stalling during use?

Stalling can be caused by a dirty air filter, a clogged fuel filter, or improper carburetor settings. Cleaning or replacing these components and adjusting the carburetor may resolve the issue.

How can I replace the spark plug on the Stihl MS 661?

First, remove the spark plug boot. Use a spark plug wrench to unscrew the old spark plug. Install a new spark plug by screwing it in by hand, then tightening with the wrench. Reattach the spark plug boot.

What type of bar oil should I use with my Stihl MS 661?

Stihl recommends using its own brand of bar and chain oil for optimal performance, but any high-quality bar oil designed for chainsaws will work.

How do I store the Stihl MS 661 for an extended period?

Drain the fuel tank and run the engine until it stops to clear the carburetor. Clean the saw thoroughly, especially the air filter and chain. Store in a dry, secure place away from direct sunlight.