Stihl TS 420 - 12.3.8 Adjusting screws

88 TS 410, TS 420
– Examine the throttle shaft (1) and
torsion spring (2), replace if
necessary.
– Note the installed position (arrow)
of the torsion spring.
: Remove the cap (1).
: Remove the pump piston (2) with
sealing ring and spring (1).
– Check the various parts and
replace if necessary.
– Reassemble parts in reverse
order.
2
1
370RA387 TG
370RA391 TG
1
370RA118 TG
1
2
: Slide the throttle shaft (1) into the
carburetor housing with the
torsion spring from the side with
the adjusting screws.
: Lay the torsion spring on the
shoulder (arrow) of the
carburetor housing.
: Press the piston of the
accelerator pump into the hole
(arrow) with a suitable tool and
push the throttle shaft through
further.
370RA388 TG
1
370RA389 TG370RA390 TG
: Fit the sealing ring (1), ring (2)
and sleeve (3).
: Lay the pre-tensioned leg of the
torsion spring (1) against the
sleeve (arrow).
: Slide the lever (1) into the hole
(arrow) in the throttle shutter
shaft.
– Insert and tighten down the
screw.
370RA216 TG
3 2 1
370RA395 TG
1
370RA396 TG
1