Stihl TS 420 - Throttle Shaft; Throttle Shutter

87TS 410, TS 420
– Coat the screw with screw
locking paint, b 14.
: Insert a new screw (1) and screw
it in slightly.
– Close the choke shutter (2) and
center it in the hole in the
carburetor housing.
– Tighten down the screw.
– Check correct functioning and
easy movement.
– Reassemble remaining parts in
reverse order.
12.3.7 Throttle shaft /throttle
shutter
If actuation of the throttle shaft is
stiff and/or the throttle shutter
cannot be opened or closed
properly:
– Remove the carburetor, b 12.2.
– Troubleshooting on the
carburetor, b 4.5.
– Remove the pump diaphragm,
b 12.3.4.
370RA380 TG
1
2
: Remove the screw (arrow).
: Turn the throttle shaft a little and
pull out the throttle shutter (1).
: Remove the E-clip (arrow).
– Unhook and examine the rod (1),
replace if necessary, b 12.3.5.
370RA383 TG370RA384 TG
1
370RA381 TG
1
: Remove the screw (arrow).
– Remove the lever (1).
: Remove the leg (arrow) of the
torsion spring.
: Pull off the spacer (1) and ring (2)
with sealing ring underneath.
: Pull the throttle shaft (1) out
towards the adjusting screws,
unhooking and relieving the
torsion spring (2) at the same
time.
– Clean the throttle shaft and
guides, b 14.
370RA382 TG
1
370RA319 TG
1
2
370RA386 TG
2
1