Stihl TS 420 - 12.6 Intake elbow, removal and installation

92 TS 410, TS 420
Setting the idle speed
– Make the standard setting.
– Let the engine warm up.
– Turn the idle speed screw LA
clockwise as far as the stop or
until the cutting wheel begins to
turn, then back off 1 turn.
Erratic idling behavior, poor
acceleration
(despite the standard setting)
Idle setting is too lean.
– Let the engine warm up.
– Turn the low speed screw L
counterclockwise until the engine
runs smoothly and accelerates
properly.
The setting of the idle speed screw
LA must usually also be adjusted
whenever the setting of the low
speed screw L has been corrected.
Correcting the carburetor setting
for use at high altitudes
If the engine does not run
satisfactorily, a minor correction
may have to be made.
– Check the standard setting.
– Let the engine warm up.
– Turn the high speed screw H
clockwise (leaner), but no further
than the stop.
The screws should be adjusted as
little as possible. The slightest
adjustment produces a tangible
difference in engine behavior.
If you make the setting too lean it
will increase the risk of engine
damage through lack of lubrication
and overheating.
If the adjustments do not yield any
improvement, refer also to the
troubleshooting chart for the ignition
system, carburetor and shortblock,
b 4.4, b 4.5 and b 4.6.
12.5 Choke rod and throttle
rod
Choke rod
– Remove the shroud, b 7.4.
– Remove the choke rod (1),
b 11.2.1.
– Reassemble parts in reverse
order.
– Check correct functioning.
370RA291 TG
1
Throttle rod
– Remove the shroud, b 7.4.
: Unhook the throttle rod (1) from
the throttle shaft lever (arrow).
: Attach the throttle rod (1) to the
throttle shaft lever (arrow) and
place in the guide (2). It is now in
position for the subsequent
installation work.
– Install the shroud, b 7.4.
– Check correct functioning.
– Reassemble remaining parts in
reverse order.
– Tightening torques, b 3.5.
1
370RA320 TG
1
370RA330 TG
2