Stihl FS 70 Instruction Manual

Pages 104

Year 2020

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of 104

Stihl FS 70 Specification

The Stihl FS 70 is a robust and versatile grass trimmer designed for both professional landscapers and demanding homeowners. Powered by a fuel-efficient 27.2 cc 2-stroke engine, it delivers reliable performance and lower emissions. The engine is equipped with Stihl's advanced stratified charge system, which ensures optimal fuel mixture and combustion efficiency, resulting in reduced fuel consumption and exhaust emissions. This trimmer features a solid drive shaft, enhancing durability and enabling it to accommodate various cutting attachments for different tasks.

The FS 70 is designed with user comfort in mind, featuring an ergonomic loop handle that allows for easy maneuverability and control. Its lightweight construction, weighing approximately 4.9 kg (10.8 lbs), ensures reduced user fatigue during extended periods of operation. The semi-automatic choke lever simplifies starting procedures, while the simplified starting system provides reliable ignition with minimal effort.

For enhanced cutting performance, the FS 70 comes equipped with a dual-line cutting head, which offers a generous cutting swath for efficient trimming. The AutoCut C 25-2 cutting head allows for easy line advancement with a simple tap on the ground, ensuring uninterrupted work. Maintenance is straightforward, with easy access to the air filter and spark plug for routine servicing.

Overall, the Stihl FS 70 combines power, efficiency, and user-friendly features, making it a dependable choice for those seeking a high-performance grass trimmer. Its durable construction and advanced engine technology make it suitable for a variety of landscaping applications, from trimming around trees and fences to tackling tough overgrowth in large areas.

Stihl FS 70 F.A.Q.

How do I start the Stihl FS 70 trimmer?

To start the Stihl FS 70, place it on a flat surface, set the choke lever to the 'cold start' position, pump the fuel primer bulb until it fills with fuel, pull the starter rope until the engine fires, and then move the choke to the 'run' position.

What type of fuel mix should I use for the Stihl FS 70?

The Stihl FS 70 requires a 50:1 fuel mix ratio, which means 50 parts gasoline to 1 part 2-cycle engine oil. Use high-quality, unleaded gasoline with a minimum octane rating of 89.

How do I replace the trimmer line on the Stihl FS 70?

To replace the trimmer line, turn off the engine, remove the spool by pressing the tabs on the side, and take out the old line. Cut a new line approximately 12 feet long, insert it through the holes and wind it evenly on the spool. Reassemble the spool and cap.

Why is my Stihl FS 70 engine stalling during use?

Engine stalling can be caused by a clogged air filter, dirty fuel filter, or old fuel. Clean or replace the air filter, check the fuel filter, and ensure you are using fresh fuel mixed at the correct ratio.

What maintenance should be regularly performed on the Stihl FS 70?

Regular maintenance includes cleaning the air filter, checking and replacing the spark plug, inspecting the fuel system, and checking the cutting attachment for wear. Conduct these checks every 25 operating hours.

How do I adjust the carburetor on the Stihl FS 70?

To adjust the carburetor, locate the adjustment screws marked 'H', 'L', and 'LA'. Start with the 'L' screw for low-speed adjustments, then adjust the 'H' screw for high-speed, and finally set the 'LA' screw for idle speed. Use a tachometer for precise tuning.

What should I do if the Stihl FS 70 won't start?

If the trimmer won't start, check for fuel issues, ensure the spark plug is not fouled, verify the air filter is clean, and make sure the on/off switch is in the 'on' position. Inspect the ignition system if the problem persists.

How do I clean the air filter on the Stihl FS 70?

To clean the air filter, remove the cover by unscrewing the knob, take out the filter, and wash it with warm soapy water. Rinse thoroughly, let it dry completely, and then reinstall it. Replace if damaged or heavily soiled.

Can I use any type of cutting attachment with the Stihl FS 70?

No, only use cutting attachments approved by Stihl for the FS 70 model. Using improper attachments can lead to equipment damage or personal injury. Consult the user manual for compatible attachments.

How do I store the Stihl FS 70 for the winter?

Before storing, drain the fuel tank, run the engine until it stops, clean the unit thoroughly, and inspect for damage. Store in a dry and cool place, away from direct sunlight or heat sources.