Adjusting The Carburetor - Stihl BT 45 Instruction Manual

Fit the filter cover, engage the two
N
tabs (arrows) at the bottom first.
Insert the screw and tighten it down
N
firmly.
BT 45

Adjusting the Carburetor

General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
Preparations
Shut off the engine.
N
Remove the auger.
N
Check the air filter and clean or
N
replace if necessary.
Standard Setting
H
L
Turn high speed screw (H)
N
counterclockwise as far as stop (no
more than 3/4 turn).
Turn the low speed screw (L)
N
carefully clockwise until it is against
its seat, then turn it back 1 full turn
Adjusting Idle Speed
Carry out the standard setting.
N
Set rotary knob to N (gearbox in
N
neutral).
Start and warm up the engine.
N
Move the rotary knob to 1.
N
LA
L
Adjust idle speed with the idle speed
N
screw (LA) so that the drilling
spindle does not rotate.
Engine stops while idling
Turn the idle speed screw (LA)
N
slowly clockwise until the engine
runs smoothly – the drilling spindle
must not rotate.
Drilling spindle rotates when engine is
idling
Turn the idle speed screw (LA)
N
counterclockwise until the drilling
spindle stops rotating and then turn
the screw another 1/2 to 1 turn in
the same direction.
WARNING
If the drilling spindle continues rotating
when the engine is idling, have your
power drill checked and repaired by your
servicing dealer.
English
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