Stihl FS100 stops, won't stay running - Stihl 4Mix brushcutter service guide

This Stihl FS100 brushcutter would start and then stop: it wouldn't stay running and in the short periods when it would run, it sounded rough. This is a video about servicing the Stihl 4Mix engine on this machine and getting it running properly again. In this video you'll see: Removing the fuel tank, checking the lines, replacing the fuel filter. Replacing the air filter. Changing the spark plug. Adjusting the valve clearances. Adjusting the throttle cable. Greasing the drive gear. With the service complete I filled the tank with fresh fuel containing Stihl HP Super oil at a 50:1 ratio. It ran really well! Parts used: Tools: T27 Torx key or bit. Small flat blade screwdriver. 8mm spanner / wrench #FS100 0:00 Introduction 2:35 Air filter 4:15 Emptying fuel 5:20 Fuel tank removal 9:33 Fuel tank and hose inspection 12:30 Fuel filter replacement 16:20 Spark plug replacement 18:07 Valve clearances 23:49 Throttle cable adjustment 26:56 Test run after service 28:42 Greasing the drive gears 31:08 Adjusting shoulder strap and handle 32:35 Test cut 32:56 Summary Thanks for watching!