BG 56, BG 56 C, BG 66, BG 66 C, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
English
15
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 Shut off the engine.
N Check the air filter and clean or
replace as necessary.
N Check the spark arresting screen
(not in all versions) and clean or
replace as necessary.
N Turn high speed screw (H)
counterclockwise (no more than a
3/4 turn) as far as stop.
N Turn the low speed screw (L)
carefully home as far as stop and
then open it 1 full turn.
Fine Tuning for Operation in
Mountains 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.
N Warm up the engine.
At high altitude
N Turn high speed screw (H)
clockwise (leaner) – no further than
stop.
At sea level
N Turn high speed screw (H)
counterclockwise (richer) – no
further than stop.
Adjusting Idle Speed
It is usually necessary to change the
setting of the idle speed screw (LA) after
every correction to the low speed
screw (L).
Engine stops while idling
N Check the standard setting.
N Turn the idle speed screw (LA)
clockwise until the engine runs
smoothly.
Erratic idling behavior
If acceleration is poor even though the
standard setting is correct, the idle
setting is too rich:
N Turn the low speed screw (L) slowly
clockwise until the engine runs and
accelerates smoothly.
If acceleration is good, the idle setting is
too lean:
N Turn the low speed screw (L) slowly
counterclockwise until the engine
runs and accelerates smoothly.
Adjusting the Carburetor
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