Stihl TS 420 - 12 Fuel System; Air Filter; Carburetor, Removal and Installation

77TS 410, TS 420
12. Fuel system
12.1 Air filter
If engine performance deteriorates,
the air filter must be checked and
replaced if necessary.
– Refer also to troubleshooting,
b 4.5.
: Take out the screws (arrows).
– Remove the filter cover (1).
– Examine the air filter and
auxiliary filter, replace if
necessary. Refer to the user
manual.
– Reassemble parts in reverse
order.
1
370RA107 TG
12.2 Carburetor, removal and
installation
– Remove the shroud, b 7.4.
– Remove the air filter, b 12.1.
– Open the filler cap and drain the
fuel tank in accordance with
regulations, b 1.
Fuel hoses should only be
disconnected from the carburetor
after opening the filler cap.
– Unhook the choke rod, b 11.2.1.
: Unhook the throttle rod (1) from
the throttle shaft lever (arrow).
: Disconnect the fuel and
compensator hose from the
connectors (arrows).
1
370RA320 TG
370RA321 TG
: Take out the screws (arrows).
: Close the choke shutter at the
lever (arrow) and pull out the
carburetor.
: Turn the carburetor to the side
slightly and disconnect the fuel
hose (1) from the connector
(arrow).
– Examine the carburetor and
repair or replace it if necessary.
370RA322 TG
370RA323 TG
1
370RA324 TG