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21BR 45
english / USA
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
correct the adjustment of the high speed
screw within fine limits.
Standard Setting
: Shut off the engine.
: Turn high speed screw (H) counter-
clockwise as far as stop (max.
3
/
4
turn).
: Open the low speed screw (L) one
full turn.
Fine Tuning for Operation at High
Altitude or at Sea Level
A slight correction of the setting may be
necessary if engine power is not
satisfactory when operating at high
altitude or at sea level:
: Check air filter and clean if
necessary.
: Warm up the engine.
At high altitude
: Turn high speed screw (H) clock-
wise (leaner) no further than stop.
At sea level
: Turn high speed screw (H) counter-
clockwise (richer) no further than
stop.
Adjusting the Carburetor
L
H
295BA044 KN
22


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