51FS 90, FS 90 R
English / USA
Definitions
1. Fuel Filler Cap
For closing the fuel tank.
2. Carburetor Adjusting Screws
For tuning the carburetor.
3. Starter Grip
The grip of the pull starter, which is 
the device to start the engine.
4. Spark Plug Boot
Connects the spark plug to the 
ignition lead.
5. Muffler
(with spark arresting screen)
Reduces exhaust noises and 
diverts exhaust gases away from 
operator.
6. Bike Handle 
For easy control of the machine with 
both hands during cutting work.
7. Throttle Trigger
Controls the speed of the engine.
8. Slide Control
For starting throttle, run and stop. 
Keeps the throttle partially open 
during starting, switches the 
engine’s ignition off to stop the 
engine.
  9. Throttle Trigger Interlock 
Must be depressed before the 
throttle trigger can be activated.
10. Throttle Cable Retainer
Secures the throttle cable to the 
drive tube.
11. Carrying Ring
Connects the brushcutter to the 
harness.
12. Fuel Pump
Provides additional fuel feed for a 
cold start.
13. Choke Knob
Operates choke to enrich the 
mixture for easier engine starts.
14. Air Filter Cover
Encloses and protects the air filter. 
15. Fuel Tank 
For fuel and oil mixture.
16. Machine Support 
For resting machine on the ground.
17. Handle Support 
Connects the shaft and bike handle.
18. Wing Screw
Locks handlebar in selected 
position.
19. Loop Handle 
For easy control of machine during 
operation.
20. Barrier Bar 
Helps maintain clearance between 
cutting tool and feet and legs of 
operator.