Instruction Manual

BT 45
English
19
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
N Shut off the engine.
N Remove the auger.
N Check the air filter and clean or
replace if necessary.
Standard Setting
N Turn high speed screw (H)
counterclockwise as far as stop (no
more than 3/4 turn).
N Turn the low speed screw (L)
carefully clockwise until it is against
its seat, then turn it back 1 full turn
Adjusting Idle Speed
N Carry out the standard setting.
N Set rotary knob to N (gearbox in
neutral).
N Start and warm up the engine.
N Move the rotary knob to 1.
N Adjust idle speed with the idle speed
screw (LA) so that the drilling
spindle does not rotate.
Engine stops while idling
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly – the drilling spindle
must not rotate.
Drilling spindle rotates when engine is
idling
N Turn the idle speed screw (LA)
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.
Erratic idling behavior, poor acceleration
(even though standard setting of low
speed screw is correct)
Idle setting is too lean
N Turn the low speed screw (L) slowly
counterclockwise until the engine
runs and accelerates smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA) after
every correction to the low speed
screw (L).
Fine Tuning for Operation at High
Altitude
A slight correction of the setting may be
necessary if the engine does not run
satisfactorily:
N Carry out the standard setting.
N Set rotary knob to N (gearbox in
neutral).
N Warm up the engine.
N Turn high speed screw (H) slightly
clockwise (leaner) – no further than
stop.
NOTICE
After returning from high altitude, reset
the carburetor to the standard setting.
If the setting is too lean there is a risk of
engine damage due to insufficient
lubrication and overheating.
Adjusting the Carburetor
H
L
421BA046 KN
L
LA
421BA047 KN