28
English / USA
BT 121
Definitions
1. Starter Grip
The grip of the pull starter, which is
the device to start the engine.
2. Carburetor Adjusting Screws
For tuning the carburetor.
3. Air Filter Cover
Encloses and protects the air filter.
4. Fuel Filler Cap
For closing the fuel tank.
5. Muffler
(with spark arresting screen)
Reduces exhaust noises and
diverts exhaust gases away from
operator.
6. 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.
7. Throttle Trigger Interlock
Must be depressed before the
throttle trigger can be activated.
8. Throttle Trigger
Controls the speed of the engine.
9. Spark Plug Boot
Connects the spark plug to the
ignition lead.
10. Screw Plug
Seals filler opening for gearbox
grease.
11. Drilling spindle
For attaching the chuck or adapter
to the power drill.
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. Auger Brake Activating Lever
Lever for engaging and disengaging
the auger brake.
15. Padding
Helps cushion thigh against handle
frame.
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 two-stroke engine
Displacement: 1.88 cu.in
(30.8 cm
3
)
Bore: 1.38 in
(35 mm)
Stroke: 1.26 in
(32 mm)
Engine power
to ISO 8893 1.8 bhp
(1.3 KW)
Max. engine speed
without auger 12,300 rpm
Idle speed 2,800 rpm
Specifications
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