Specifications - Stihl FC 91 Instruction Manual

English
Definitions
1. Loop Handle
For easy control of machine during
cutting work.
2. Stop Switch
Switches the engine's ignition off
and stops the engine.
3. Throttle Trigger Lockout
Must be depressed before the
throttle trigger can be activated.
4. Throttle Trigger
Controls the speed of the engine.
5. Choke Lever
Eases engine starting by enriching
mixture.
6. Air Filter Cover
Covers and protects the air filter
element.
7. Fuel Tank
For fuel and oil mixture.
8. Machine Support
For resting machine on the ground.
9. Fuel Filler Cap
For closing the fuel tank.
10. Carburetor Adjusting Screws
For tuning the carburetor.
11. Starter Grip
The grip of the pull starter, for
starting the engine.
12. Manual Fuel Pump
Provides additional fuel feed for a
cold start.
13. Cover
Covers and protects the spark plug.
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14. Muffler with Spark Arresting Screen
Muffler reduces exhaust noises and
diverts exhaust gases away from
operator.
Spark arresting screen is designed
to reduce the risk of fire.
15. Cutting Blade
Metal cutting blade for cutting
weeds and soft green plants.
16. Deflector
The deflector is designed to reduce
the risk of injury from foreign objects
flung backwards toward the
operator by the cutting attachment
and from contact with the cutting
attachment.
17. Drive Tube
Encloses and protects the drive
shaft between the coupling sleeve
and gearbox.
18. Depth Wheel
Deflector-mounted depth wheel
rolls on ground and keeps edger
blade at preset height for required
depth of cut.
19. Wingnut
Must be loosened to shift the wheel
to adjust the depth of cut.
20. Gearbox
Reduces engine speed to speed
required to drive the edger blade.
21. Wear Guard
Protects the gearbox from wear.
22. Skirt
Designed to reduce the risk of injury
from foreign objects flung back
towards the operator by the cutting
blade.

Specifications

EPA / CEPA
The Emission Compliance Period
referred to on the Emissions
Compliance Label indicates the number
of operating hours for which the engine
has been shown to meet Federal
emission requirements.
Category
A = 300 hours
B = 125 hours
C = 50 hours
CARB
The Emission Compliance Period used
on the CARB-Air Index Label indicates
the terms:
Extended = 300 hours
Intermediate = 125 hours
Moderate = 50 hours
Engine
STIHL single cylinder four-stroke engine
with mixture lubrication
Displacement: 1.73 cu.in (28.4 cc)
Bore: 1.5 in (38 mm)
Stroke: 0.98 in (25 mm)
Engine power to 1.3 bhp (0.95 kW)
ISO 8893: at 7,000 rpm
Idle speed: 2,800 rpm
FC 91