Stihl FS 120, FS 200, FS 300, FS 350, FS 400 and FS 450 series of garden tools repair guide will help with the Throttle Control. The FS series of the engine are often found in strimmers, brush cutters, edgers, and other tools. A Service Manual detailing the Throttle Control procedures including full diagrams, as well as more complete repair information, is available to download. Also, a Stihl FS120, FS200, FS300, FS350, FS400, and FS450 Parts List, Operator Manual, and carburetor manual are also available to view or download as a PDF which can be read on any device or printed.

THROTTLE CONTROL

Throttle Trigger/Interlock Lever (Bike Handle)

• • Take out screw and washer.
• Pull off the control handle.

Warning: To avoid the risk of electric shock, do not start the unit while the control handle is open.

• • Use a screwdriver (1) 5910 890 2301 to take out the screws.
• Separate the two halves of the handle.

• • Lift the interlock lever (1) slightly and turn it to one side until the torsion spring (2) is relaxed.
  • Pull the interlock lever off the peg.
• Remove the torsion spring.

• Take the throttle trigger (1) with torsion spring (2) and throttle cable (3) off the peg.

• Disconnect throttle cable from the trigger.

Assemble in the reverse sequence.

• Attach the throttle cable, then position torsion spring as shown and push its long arm into the slot.

• The interlock lever must be behind the throttle trigger.

• Check correct positions of the throttle cable (1), contact spring (2), protective tube (3) and insulator (4).

Contact Springs/Detent Spring in Control Handle 7.3 Throttle Trigger/Interlock (Bike Handle) Lever (Loop Handle)

• Remove the throttle trigger – see 7.1.
• Lift contact spring (1) a little and remove the throttle cable (2).

• Remove spring from seats (1) and peg (2).

• Remove contact spring from peg
  • • 1. and collar screw (2).
• Take out slide control’s collar screw (1).
• Remove detent spring (2).
• Pull slide control out of handle molding.

Assemble in the reverse sequence.

• Engage contact spring correctly in the groove of collar screw.

FR 350/450

• Use a screwdriver (1) 5910 890 2301 to remove the screw.
• Push guard (2) forward.

All models

Warning: To avoid the risk of electric shock, do not start the unit while the control handle is open.

• Use a screwdriver (1) 5910 890 2301 to take out the screws.
• Remove handle molding.

• Remove torsion spring.

Slide Control (Loop Handle)

• • Pull throttle trigger (1) with throttle cable (2) off the peg.

• • Disconnect throttle cable from the trigger.

• • Lift contact spring (1) a little and remove the throttle cable (2).
• Pull interlock lever with contact spring off the peg.
• Remove contact spring from interlock lever.

Assemble in the reverse sequence.

• Check positions of the throttle cable (1), contact spring (2), protective tube (3) and insulator (4).
• Tighten screws to 1.0 Nm (0.75 lbf.ft).

Stihl FS 120, FS 200, FS 300, FS 350, FS 400 and FS 450 Throttle Control