Stihl TS 420 - 12.5 Choke rod and throttle rod; Choke rod; Throttle rod

91TS 410, TS 420
: Turn the high speed screw H (1)
clockwise until it is firmly in its
seat.
: With the high speed screw H (1)
in its seat, give it 1.5 turns
counterclockwise to obtain the
basic setting.
: Turn the low speed screw L (2)
clockwise until it is firmly in its
seat.
: With the low speed screw L (2) in
its seat, give it 1 turn
counterclockwise to obtain the
basic setting.
370RA402 TG
1 2
Always use a new limiter cap;
before fitting it, hold it so that the
bump on the limiter cap is below the
stop (arrow), then press it home on
the high speed screw.
: Press the limiter cap (1) onto the
high speed screw H.
The high speed screw H is now
limited. The standard setting has
been obtained when the high speed
screw H is turned counterclockwise
until it engages.
370RA403 TG
1
12.4.2 Standard setting
The limiter cap must not be
removed when making the standard
setting.
To avoid problems, the following
steps must be performed for all
settings:
– Troubleshooting, b 4.5.
– Check and adjust axial truth of
running of the cutting wheel.
– Examine the spark arresting
screen (if installed); clean or
replace it if necessary, b 7.1.
– Examine the air filter, replace if
necessary, b 12.1.
Standard setting
– Switch off engine.
– Carefully turn the high speed
screw H counterclockwise as far
as possible (max. ¾ turn).
– Carefully turn the low speed
screw L clockwise as far as
possible, then back off 1 turn.
370RA404 TG