Standard Setting - Stihl SR 430 Manual

Installing limiter cap
The setting of the high speed
screw (H) is always secured with a
new limiter cap after completing the
basic setting.
1
: Position the limiter cap (1) so that
its lug is above the stop (arrow).
: Push the limiter cap (1) fully onto
the high speed screw (H).
a
: Do not push the limiter cap (1) up
against the carburetor body since
it will otherwise be damaged.
Clearance 'a' (arrow) must be at
least 1 mm.
The movement of the high speed
screw (H) is now limited.
SR 430, SR 450
The standard setting is obtained by
turning the high speed screw (H)
counterclockwise until it snaps
lightly into position.
The basic setting of the high speed
screw (H) is now fixed.
9.7.2

Standard Setting

The limiter cap must not be
removed for the standard setting.
Always perform the following steps
before carrying out any
adjustments:
– Troubleshooting, b 3.4
– Shut off the engine.
1
– Inspect the spark arresting
screen (if fitted) and clean or
replace it if necessary, b 4.1
– Check the air filter and clean or
replace if necessary, b 9.1
– Check operation of throttle cable
and readjust if necessary,
b 9.8.1
– Turn the high speed screw ( H)
slowly counterclockwise as far as
stop, but no more than a
3/4 turn.
– Turn the low speed screw (L)
slowly clockwise as far as stop –
then open it 1 full turn
counterclockwise.
– Start the machine and warm up
the engine.
– Check running behavior: The
engine must idle and accelerate
smoothly when the throttle is
opened.
Adjusting engine idle speed
Engine stops while idling:
– Carry out standard setting.
– Turn the idle speed screw ( LA)
slowly clockwise until the engine
runs smoothly.
Erratic idling behavior, engine
stops even though setting of idle
speed screw (LA) has been
corrected, poor acceleration
Idle setting too lean.
– Warm up the engine.
– Turn the low speed screw (L )
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).
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