Stihl FS55R Manual: A Comprehensive Guide
Welcome! This detailed guide assists users in mastering their Stihl FS55R, offering insights into operation, maintenance, safety, and troubleshooting procedures.

The Stihl FS55R is a versatile and powerful string trimmer designed for homeowners tackling various landscaping tasks. This manual serves as your comprehensive resource for understanding and safely operating this equipment. It details everything from initial assembly to routine maintenance, ensuring optimal performance and longevity.
Understanding your FS55R’s capabilities and limitations, as outlined within this guide, is crucial. Proper usage, coupled with diligent maintenance, will maximize efficiency and minimize potential issues. Always prioritize safety by adhering to the precautions detailed throughout this instruction manual.

Understanding the Manual’s Importance
This instruction manual isn’t merely a guide; it’s integral to the safe and effective operation of your Stihl FS55R. It contains vital safety warnings, detailed assembly instructions, and crucial maintenance procedures. Ignoring this information could lead to equipment damage, personal injury, or voiding the product warranty.
Do not lend or rent your power tool without providing the manual alongside it. Ensure anyone operating the FS55R fully comprehends its contents. Stihl continuously improves its products, so referencing the manual ensures you’re utilizing the most up-to-date operational knowledge.

Safety Precautions
Prioritize safety when operating the Stihl FS55R. Always read and understand all safety warnings within this manual before use. Wear appropriate personal protective equipment, including eye and hearing protection, sturdy footwear, and long trousers. Never operate the trimmer with missing or damaged parts.
Be mindful of bystanders and pets, maintaining a safe working distance. Inspect the area for hazards before starting. Disconnect the spark plug wire before performing any maintenance or adjustments. Proper handling prevents accidents and ensures long-lasting performance.
General Safety Warnings
Important! Always disconnect the spark plug wire before any maintenance, preventing accidental starting. Never operate the Stihl FS55R if you are tired or under the influence of drugs or alcohol. Ensure proper ventilation when fueling. Avoid operating in enclosed spaces.
Inspect the trimmer regularly for damage. Do not modify the tool. Be aware of potential hazards like thrown objects. Keep hands and feet clear of the cutting head. Always use the correct cutting head for the task. Following these warnings minimizes risk and promotes safe operation.
Specific Safety Instructions for the FS55R
Caution! The FS55R’s high-speed cutting head presents significant hazards. Always wear appropriate personal protective equipment, including eye and hearing protection. Maintain a firm grip with both hands during operation. Be mindful of bystanders and maintain a safe working distance.
Inspect the string trimmer head for secure attachment before each use. Never use damaged or worn cutting attachments. Avoid trimming near hard objects that could cause ricochet. Regularly check for loose fasteners. Adhering to these specific instructions ensures safe and effective operation of your FS55R.

Component Identification
Understanding your FS55R is key! This section details crucial components. Engine components include the rewind starter, throttle control, and fuel tank – vital for operation. The cutting head and accessories encompass the string trimmer head, various string types, and optional blade attachments.
Familiarize yourself with the location of each part for effective maintenance and repairs. Knowing these components aids in troubleshooting and ensures proper assembly. Refer to diagrams within the full manual for visual guidance and precise identification of each element within your Stihl FS55R.
Engine Components
Essential for power and performance! Key engine components of the Stihl FS55R include the robust rewind starter, ensuring reliable ignition. The throttle control manages engine speed, while the fuel tank provides necessary fuel supply. Inspect the spark plug regularly for optimal combustion.
Understanding these parts aids in troubleshooting starting issues or performance declines. Proper maintenance, like fuel filter checks, extends engine life. Detailed diagrams in the manual illustrate each component’s location and function, supporting effective servicing and repair procedures.
Cutting Head and Accessories
Maximize versatility! The Stihl FS55R’s cutting head accepts various accessories for diverse tasks. Standard options include nylon trimmer line for grass and weeds, and optional blade attachments for thicker vegetation. Proper installation is crucial for safe operation; consult the manual’s diagrams.
Regularly inspect the trimmer head for wear and damage. Accessory changes require specific tools and procedures detailed within the guide. Understanding compatible accessories expands the FS55R’s capabilities, ensuring efficient and effective landscaping work.
Assembly Instructions
Proper assembly is key! Before initial use, carefully follow these instructions. The Stihl FS55R requires attachment of the handle, shield, and cutting head. Ensure all components are securely fastened using the provided hardware. Refer to the detailed diagrams in the manual for correct orientation and torque specifications.
Incorrect assembly can compromise safety and performance. Double-check all connections before starting the engine. A properly assembled FS55R will deliver optimal control and efficiency during operation. Do not lend or rent without the manual!
Handle and Shield Attachment
Securely attaching the handle and shield is crucial for operator comfort and safety. Begin by aligning the handle components, ensuring a firm grip area. Fasten with the provided bolts, tightening to the specified torque – consult the manual’s diagrams. Next, attach the protective shield, aligning it correctly to deflect debris.
Verify the shield doesn’t interfere with trimmer head movement. Proper attachment minimizes vibration and maximizes control. Always inspect these connections before each use, ensuring they remain tight. A loose handle or shield compromises safety!
String Trimmer Head Installation
Installing the string trimmer head requires careful attention to detail. First, ensure the engine is switched off and the spark plug is disconnected for safety. Clean the drive shaft and apply a small amount of grease. Align the trimmer head with the shaft, pressing firmly until it clicks into place.
Next, load the trimmer line according to the manual’s instructions, ensuring correct direction and length. Finally, securely tighten the trimmer head cap. Regularly check the line feed and head security before each use to prevent interruptions and ensure optimal performance.
Operation Instructions
Before operation, always inspect the Stihl FS55R for damage and ensure proper assembly. Fuel the engine with the correct fuel mixture, following the manual’s guidelines. To start, engage the choke, set the throttle to the starting position, and firmly pull the starter cord. Once running, disengage the choke and gradually increase the throttle.
Maintain a firm grip and a safe distance while trimming. Avoid contact with hard objects and always wear appropriate safety gear. Regularly check the trimmer line and engine performance during operation for optimal results.
Starting the Engine
To initiate the FS55R, ensure the fuel valve is open and the machine is on a flat surface. Engage the choke lever for cold starts, and set the throttle to the starting position. Firmly grasp the starter handle and pull the cord with a smooth, deliberate motion. Avoid rapid pulling.
Once the engine sputters, disengage the choke. Continue pulling until the engine runs steadily. For warm starts, the choke may not be necessary. Always maintain a secure grip and be aware of the trimmer head’s position during starting.
Trimming Techniques
Effective trimming with the FS55R involves a sweeping motion, maintaining a slight angle to the vegetation. Avoid forcing the trimmer head into thick growth; instead, use a walking pace and overlap cuts. For optimal results, trim in a circular or side-to-side pattern.
Be mindful of objects that could cause damage to the string or machine. Regularly inspect the cutting head and adjust the string length as needed. Prioritize safety by wearing appropriate protective gear during operation, and always maintain control of the tool.
Maintenance and Servicing
Regular maintenance is crucial for the longevity and performance of your Stihl FS55R. This includes frequent checks of the fuel level, air filter cleanliness, and spark plug condition. Proper fueling with the correct fuel mixture is essential, as is routine air filter cleaning to ensure optimal engine function.
Scheduled spark plug replacement maintains ignition efficiency. Always disconnect the spark plug wire before performing any maintenance. Refer to the manual for specific intervals and procedures to keep your FS55R running smoothly.
Fueling the FS55R
Proper fueling is vital for optimal performance. Always use a 50:1 mixture of high-quality 2-stroke engine oil and unleaded gasoline. Ensure the fuel container is clean and designed for fuel storage. Before fueling, the engine must be completely stopped and cool.
Carefully remove the fuel cap, add the correct mixture, and securely replace the cap. Avoid spilling fuel and wipe up any spills immediately. Never fuel a hot engine, and always fuel in a well-ventilated area.
Air Filter Cleaning
Regular air filter maintenance ensures efficient engine operation. After each use, or more frequently in dusty conditions, remove the air filter cover. Gently tap the filter to remove loose debris, or use compressed air – blowing from the inside out.
For heavily soiled filters, wash in warm, soapy water, rinse thoroughly, and allow to dry completely before re-installation. A clogged air filter reduces power and increases fuel consumption. Inspect for damage and replace if necessary.
Spark Plug Replacement
Periodic spark plug replacement is crucial for optimal engine performance. Disconnect the spark plug wire before proceeding. Use a spark plug wrench to carefully remove the old plug. Check the gap of the new spark plug using a feeler gauge, adjusting if needed to the manufacturer’s specification.
Install the new spark plug, tightening it securely but avoid over-tightening. Reconnect the spark plug wire. A faulty or worn spark plug can cause starting difficulties and reduced engine power.
Troubleshooting Common Issues
Encountering problems? This section addresses frequent FS55R issues. Engine won’t start? Check fuel levels, spark plug connection, and air filter cleanliness. String feed problems? Ensure the trimmer head is correctly assembled and the string is loaded properly. Inspect the spool for obstructions or damage.
Consistent issues may indicate a need for professional servicing. Refer to the manual’s detailed diagrams and troubleshooting charts for further assistance. Regular maintenance minimizes these occurrences, ensuring reliable operation.
Engine Won’t Start
Frustrated with a non-starting engine? First, verify sufficient fuel and proper fuel mixture. Inspect the spark plug – is it clean and correctly gapped? A fouled plug prevents ignition. Next, check the air filter; a clogged filter restricts airflow. Ensure the choke is engaged correctly during cold starts, and the throttle is set appropriately.
Confirm the spark plug wire is securely connected. If problems persist, consult the manual’s detailed diagrams or seek assistance from an authorized Stihl dealer for professional diagnosis.
String Feed Problems
Experiencing issues with string advancement? Ensure the trimmer head is properly installed and the string is loaded correctly, following the manual’s illustrations. Check for tangled or broken string within the spool. Verify the bump feed mechanism isn’t obstructed by debris or grass buildup.
A worn or damaged spool can also cause feeding issues. Disassemble, clean, and inspect all components. If the problem continues, refer to the manual’s troubleshooting section or contact a Stihl authorized dealer for expert assistance.

Technical Specifications
Understanding your FS55R’s capabilities requires reviewing key specifications. The engine displacement is 27.2 cc, delivering reliable power for trimming tasks. Fuel capacity is 0.79 quarts (0.75 liters), ensuring extended runtime. Weight, excluding cutting equipment, is approximately 11.2 pounds (5.1 kg).
Dimensions are carefully engineered for maneuverability. Detailed information regarding sound power level and vibration levels are also provided within the manual for operator comfort and safety. Refer to the full specifications chart for precise measurements.

Engine Details

The Stihl FS55R is powered by a 27.2 cc, 2-stroke engine, known for its efficient fuel consumption and reliable performance. It features a digitally ignited CDI ignition system for consistent starting and smooth operation. The engine utilizes a carburetor with controlled throttle for precise power delivery.
Maximum engine speed reaches 9,000 rpm, providing ample power for various trimming applications. The engine is designed for optimal performance with Stihl’s recommended fuel mixture. Detailed information on fuel specifications and mixing ratios can be found within the manual.
Weight and Dimensions
The Stihl FS55R boasts a dry weight of approximately 11.0 lbs (5.0 kg), contributing to its manageable handling and reduced user fatigue during extended use. Its overall length is around 45.3 inches (1150 mm), providing a good reach for trimming tasks. The shaft length measures approximately 37.4 inches (950 mm), offering comfortable operation for various user heights.
These compact dimensions and lightweight design enhance maneuverability, making it ideal for navigating tight spaces and tackling diverse landscaping projects. Precise measurements are crucial for transport and storage considerations.
Understanding the Warranty
Stihl provides a limited warranty on the FS55R, covering defects in materials and workmanship under normal use. The standard warranty period typically begins on the date of original purchase. It’s crucial to register your product promptly to ensure full warranty coverage.
The warranty doesn’t cover items subject to normal wear and tear, such as cutting attachments or spark plugs. Modifications or improper maintenance can void the warranty. Refer to the official Stihl warranty statement included with your purchase for complete details and specific terms.
Downloading the PDF Manual
Accessing a digital copy of your Stihl FS55R manual is easy! Stihl offers PDF versions of all their instruction manuals on their official website. This allows for convenient access on your computer, tablet, or smartphone. Simply navigate to the Stihl support section and search for the FS55R model.
Downloading the PDF ensures you always have the latest information at your fingertips, including safety precautions, maintenance schedules, and troubleshooting guides. Having a digital copy is especially useful when working away from a physical manual.
Copyright Information
This instruction manual is meticulously protected by copyright law. All rights are expressly reserved by Stihl, particularly concerning reproduction, translation into other languages, and processing using electronic systems. Unauthorized duplication or distribution of this manual, in whole or in part, is strictly prohibited.
Stihl retains exclusive ownership of the content, including text, images, and diagrams. This copyright protection ensures the integrity and accuracy of the information provided to users, safeguarding both Stihl’s intellectual property and user safety.
Stihl’s Commitment to Development
Stihl consistently invests in the ongoing development of all its machines and devices. This dedication to innovation means that specifications, design, and technical details are subject to change without prior notice. Stihl reserves the right to modify the scope of supply, form, and technical aspects of its products.
These improvements are implemented to enhance performance, safety, and user experience. Stihl’s commitment ensures customers receive cutting-edge technology and reliable equipment. Therefore, always refer to the latest version of the manual for the most accurate information.
Manual Version Specificity (US Models)
Please note: The instruction manual you are accessing has been specifically tailored for Stihl products distributed and sold within the United States. This version incorporates details relevant to US regulations, safety standards, and warranty policies.
Variations may exist in manuals intended for other regions due to differing local requirements. Always ensure you are referencing the manual designated for your specific country of purchase and operation. Using the correct manual guarantees accurate information and safe product usage.
Original Instruction Manual Details
Important Information: This document represents the original instruction manual for the Stihl FS55R. It’s meticulously crafted and protected by copyright, safeguarding all rights concerning reproduction, translation, and electronic processing.
The manual was printed on bleached, chlorine-free paper, reflecting Stihl’s commitment to environmental responsibility. Referencing the original ensures access to the most accurate and up-to-date guidance for safe operation, maintenance, and troubleshooting of your Stihl FS55R string trimmer.
Locating Specific Pages
Navigating the Manual: The Stihl FS55R manual is structured for easy access to crucial information. Page 1 specifically details the FS 55 model, initiating your understanding. Pages 2 and 3 provide further introductory content, setting the stage for detailed instructions.
Remember, the manual is designed to guide you through every aspect of your trimmer, from initial setup to complex repairs. Efficiently locating specific pages ensures quick access to the information needed for optimal performance and safe operation of your Stihl FS55R.
Additional Resources
Expanding Your Knowledge: For comprehensive support beyond this manual, visit the Stihl Official Website. There, you’ll find frequently asked questions, detailed product information, and potential software updates.
Need local assistance? Utilize the Authorized Dealer Locator on the Stihl website to quickly find the nearest service center. These professionals offer expert advice, genuine Stihl parts, and qualified repair services. Remember, proper maintenance and professional support are key to maximizing the lifespan and performance of your FS55R.
Stihl Official Website
Your Digital Resource: The official Stihl website serves as a central hub for all FS55R related information. Explore detailed product specifications, access downloadable resources like safety data sheets, and view instructional videos demonstrating proper usage and maintenance techniques.
Frequently asked questions are addressed in a dedicated support section, and you can register your product for warranty purposes. The website also provides a platform to locate authorized Stihl dealers near you, ensuring access to genuine parts and expert service.
Authorized Dealer Locator
Find Local Expertise: Locating an authorized Stihl dealer is crucial for genuine parts, professional servicing, and expert advice regarding your FS55R. Stihl’s dealer network ensures qualified technicians are available for repairs, maintenance, and troubleshooting.
Utilize the dealer locator tool on the official Stihl website to pinpoint the nearest authorized service center based on your location. These dealers offer a comprehensive range of Stihl products, accessories, and protective gear, guaranteeing optimal performance and longevity for your string trimmer.
