Before performing any service, it is critical to know the baseline performance metrics of the FS 40. Specification 27.2 cm³ (1.7 cu-in) Power Output 0.7 kW (0.9 bhp) Weight ~9.9 lbs (4.5 kg) Fuel Capacity 0.34 Liters (11.5 oz) Spark Plug NGK CMR6H or Bosch USR 4AC (0.5 mm / 0.02" gap) Idle Speed Clutch Engagement Core Sections of the Service Manual FS36, FS40 and FS44 Service Manual | PDF - Scribd
If the pull cord is stuck or won't retract, the rewind spring or starter rope has failed. The service manual provides an "exploded view" diagram of the starter assembly, showing the correct routing of the rope and the tension required for the spring. This is a common repair that, with the manual’s guidance, can be done in under an hour. stihl fs 40 service manual
The STIHL FS 40 is a staple in the garages of homeowners and landscaping professionals alike. Known as a lightweight, dependable trimmer, it is part of STIHL’s extensive line of outdoor power equipment. However, like all internal combustion engines, the FS 40 requires regular maintenance to perform at its peak. Whether you are a DIY enthusiast looking to save on repair costs or a professional landscaper needing a quick reference, understanding how to utilize a is essential. Before performing any service, it is critical to