BT 45
English
21
Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.
General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
With this carburetor it is only possible to
adjust the high speed screw within fine
limits.
Standard Setting
N Shutting down the engine
N Remove the auger.
N Check the air filter and clean or
replace it if necessary.
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 as far as stop,
then open it 1 full turn.
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.
Adjusting Idle Speed
Engine stops while idling
N Turn the low speed screw (L)
carefully clockwise as far as stop,
then open it 1 full turn.
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.
Erratic idling behavior, poor acceleration
(even though low speed screw is open
one turn)
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).
Engine Management Adjusting the Carburetor
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