Stihl SR 450 Product Instruction Manual - Page 22

Operating Instructions, Metering Unit - carburetor

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English Fuel tank run until completely dry N After refueling, press the fuel pump bulb at least eight times - even if the bulb is filled with fuel. N Set the choke knob according to engine temperature. N Start the engine. Operating Instructions During break-in period A factory-new machine should not be run at high revs (full throttle off load) for the first three tank fillings. This avoids unnecessary high loads during the break-in period. As all moving parts have to bed in during the break-in period, the frictional resistances in the engine are greater during this period. The engine develops its maximum power after about 5 to 15 tank fillings. During Operation After a long period of full throttle operation, allow the engine to run for a short while at idle speed so that engine heat can be dissipated by the flow of cooling air. This protects enginemounted components (ignition, carburetor) from thermal overload. After Finishing Work Storing for a short period: Wait for the engine to cool down. Empty the fuel tank and keep the machine in a dry place, well away from sources of ignition, until you need it again. For longer out-ofservice perionds - see "Storing the Machine". Metering Unit Valve lever A 1 0002BA061 KN B 1 Solution feed is started and stopped with the valve lever (1). N Position A (valve lever vertical, up) - open N Position B (valve lever horizontal, down) - closed Metering knobs The scope of supply includes metering knobs which allow a wide range of different discharge rates. 20 SR 430, SR 450

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SR 430, SR 450
English
20
Fuel tank run until completely dry
N
After refueling, press the fuel pump
bulb at least eight times – even if the
bulb is filled with fuel.
N
Set the choke knob according to
engine temperature.
N
Start the engine.
During break-in period
A factory-new machine should not be
run at high revs (full throttle off load) for
the first three tank fillings. This avoids
unnecessary high loads during the
break-in period. As all moving parts
have to bed in during the break-in
period, the frictional resistances in the
engine are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
During Operation
After a long period of full throttle
operation, allow the engine to run for a
short while at idle speed so that engine
heat can be dissipated by the flow of
cooling air. This protects engine-
mounted components (ignition,
carburetor) from thermal overload.
After Finishing Work
Storing for a short period: Wait for the
engine to cool down. Empty the fuel tank
and keep the machine in a dry place,
well away from sources of ignition, until
you need it again. For longer out-of-
service perionds – see "Storing the
Machine".
Valve lever
Solution feed is started and stopped with
the valve lever (1).
N
Position A (valve lever vertical, up)
– open
N
Position B (valve lever horizontal,
down) – closed
Metering knobs
The scope of supply includes metering
knobs which allow a wide range of
different discharge rates.
Operating Instructions
Metering Unit
1
0002BA061 KN
A
B
1