Stihl MS 261 C-MQ Instruction Manual

Pages 128

Year 2017

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of 128

Stihl MS 261 C-MQ Specification

The Stihl MS 261 C-MQ is a professional-grade chainsaw designed for efficiency and reliability in demanding forestry and agricultural tasks. It is equipped with a powerful 50.2 cc engine that delivers a robust performance while maintaining fuel efficiency. The chainsaw integrates the M-Tronic™ engine management system, which automatically adjusts the fuel mix and ignition timing for optimal performance in various conditions, minimizing manual carburetor adjustments. An enhanced filtration system ensures prolonged engine life, featuring a pre-separation air filtration mechanism that reduces maintenance frequency.

The MS 261 C-MQ incorporates the Quickstop® Plus chain braking system, offering increased safety by allowing the chain to stop within fractions of a second when the rear handle is released. Ergonomically designed for user comfort, the chainsaw features an anti-vibration system to reduce operator fatigue during extended use. Weighing approximately 10.8 pounds without fuel, the chainsaw balances its sturdy construction with maneuverability. The Ematic™ lubrication system efficiently delivers oil to the bar and chain, reducing oil consumption by up to 50%.

The MS 261 C-MQ also includes a side-access chain tensioner, facilitating easy chain adjustments, and a toolless fuel and oil cap for quick refueling. Its design is focused on durability and ease of use, making it suitable for both professional foresters and demanding landowners. With a combination of advanced technology, safety features, and user-centric design, the Stihl MS 261 C-MQ stands out as a reliable tool for intensive cutting tasks.

Stihl MS 261 C-MQ F.A.Q.

How do I start the Stihl MS 261 C-MQ chainsaw?

To start the Stihl MS 261 C-MQ, first ensure the chain brake is engaged. Move the Master Control Lever to the cold start position, pull the starter rope until the engine fires, and then move the lever to the warm start position. Pull the starter rope again until the engine starts. Finally, squeeze the throttle trigger briefly to set the chainsaw to idle.

What type of fuel should I use for the MS 261 C-MQ?

The Stihl MS 261 C-MQ requires a fuel mixture of 50:1 (gasoline to oil ratio) using high-quality 89 octane unleaded gasoline and Stihl 2-cycle engine oil.

How do I properly adjust the chain tension on the MS 261 C-MQ?

To adjust the chain tension, first ensure the chainsaw is turned off. Use the combination wrench to loosen the nuts on the sprocket cover. Turn the tensioning screw clockwise to tighten the chain until it fits snugly against the guide bar. Lastly, retighten the nuts securely.

What is the recommended maintenance schedule for the MS 261 C-MQ?

Regular maintenance includes checking the chain tension and lubrication before each use, cleaning the air filter every 5 hours of operation, inspecting the spark plug every 25 hours, and replacing it as needed. Additionally, professional servicing is recommended annually.

How can I troubleshoot a Stihl MS 261 C-MQ that won't start?

If the chainsaw won't start, check the fuel level and ensure it's properly mixed. Inspect the spark plug for fouling and replace it if necessary. Ensure the air filter is clean and the starter rope is in good condition. If problems persist, consult a professional technician.

How do I clean the air filter on the MS 261 C-MQ?

To clean the air filter, remove the cover and take out the filter. Use compressed air or gently tap the filter to remove debris. If the filter is heavily soiled, wash it in warm soapy water, rinse thoroughly, and allow it to dry completely before reinstalling.

Can the Stihl MS 261 C-MQ be used in cold weather?

Yes, the Stihl MS 261 C-MQ can be used in cold weather. Stihl recommends using winter grade fuel and ensuring the carburetor is adjusted for cold conditions. Also, keep the chainsaw warm when not in use to prevent startup issues.

Why is my MS 261 C-MQ overheating?

Overheating can be caused by a clogged air filter, a dull chain, or insufficient lubrication. Ensure the air filter is clean, the chain is sharp, and the oil reservoir is filled with the proper bar and chain oil.

How do I replace the spark plug on the MS 261 C-MQ?

To replace the spark plug, first remove the spark plug boot. Use a spark plug wrench to unscrew the old plug. Insert the new spark plug, ensuring it's the correct type and gap. Tighten securely and reattach the spark plug boot.

What safety gear should I wear when operating the MS 261 C-MQ?

When operating the MS 261 C-MQ, wear protective gear including a helmet with face protection, hearing protection, gloves, chainsaw chaps or pants, and sturdy boots with non-slip soles. Ensure all gear is in good condition.