Stihl FC 90 Instruction Manual

Pages 84

Year 2015

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of 84

Stihl FC 90 Specification

The Stihl FC 90 is a professional-grade edger designed for precision and durability in landscape maintenance. Powered by a robust 28.4 cc, 4-MIX engine, it combines the benefits of both 2-stroke and 4-stroke engine technologies, offering efficient fuel consumption and reduced emissions while maintaining high torque across a wide range of speeds. The engine's unique design ensures smoother operation and easier starting, complemented by a simplified starting procedure facilitated by an electronic ignition module. Weighing approximately 13.3 pounds, the FC 90 is engineered for balance and user comfort, featuring an ergonomic loop handle that enhances maneuverability. Its adjustable depth wheel allows for precise control over cutting depth, ensuring clean and uniform edges along walkways and driveways. The construction includes a robust, open guard to provide visibility while reducing debris buildup, and a skid plate to protect the gearbox. The drive shaft is made from solid steel for enhanced durability and efficient power transfer. A multi-function control handle integrates all of the edger's controls for easy access and operation, reducing user fatigue. The Stihl FC 90 is designed to meet the rigorous demands of professional landscapers, offering reliable performance and ease of maintenance with features like a semi-automatic choke lever and a user-friendly air filter access system. Its comprehensive engineering supports prolonged use in various weather conditions, making it a versatile tool for both residential and commercial landscaping applications.

Stihl FC 90 F.A.Q.

How do I start the Stihl FC 90?

To start the Stihl FC 90, ensure the unit is on a flat surface. Set the choke lever to the closed position, press the primer bulb several times, and pull the starter cord firmly until the engine starts. Once started, move the choke to the open position.

What is the correct fuel mixture for the Stihl FC 90?

The Stihl FC 90 requires a fuel mixture of unleaded gasoline and high-quality 2-cycle engine oil at a ratio of 50:1. Ensure the mixture is well blended before use.

How can I clean the air filter on my Stihl FC 90?

To clean the air filter, first remove the air filter cover. Take out the filter and wash it gently with warm soapy water. Rinse and allow it to dry completely before reinstalling.

What should I do if the Stihl FC 90 engine is flooding?

If the engine is flooded, remove the spark plug and clear excess fuel by pulling the starter cord several times. Clean the spark plug and reinstall it before attempting to start the engine again.

How do I replace the blade on a Stihl FC 90 edger?

To replace the blade, first ensure the engine is off and spark plug is disconnected. Use a wrench to remove the blade bolt, then remove the old blade. Install the new blade and secure it by tightening the blade bolt firmly.

What regular maintenance does the Stihl FC 90 require?

Regular maintenance includes checking and cleaning the air filter, inspecting and replacing the spark plug annually, checking the fuel system for leaks, and sharpening or replacing the blade as needed.

Why is my Stihl FC 90 losing power during operation?

Loss of power can be caused by a clogged air filter, dirty spark plug, or incorrect fuel mixture. Ensure the air filter is clean, the spark plug is in good condition, and the fuel mixture is correct.

How can I adjust the carburetor on my Stihl FC 90?

Carburetor adjustment should be done by a professional, but if necessary, locate the adjustment screws and make small adjustments while the engine is running. Adjust for a smooth idle and optimal performance.

What are common causes of vibration in the Stihl FC 90?

Common causes of vibration include a damaged or unbalanced blade, loose parts, or engine issues. Check the blade for damage, tighten any loose components, and inspect the engine mounts.

How do I winterize my Stihl FC 90 edger?

To winterize, drain the fuel tank and run the engine until it stops. Clean the unit thoroughly, inspect for any damage, and store it in a dry, sheltered area. Consider adding a fuel stabilizer if storing with fuel.