Fixed Jet; Pump Diaphragm - Stihl TS 420 Manual

2 1
: Pull the inlet control lever (1) with
spindle (2) out of the groove in
the inlet needle.
The spring under the inlet control
lever may pop out.
1
2
: Pull out the inlet needle (1).
– Take out and examine the
spring (2), replace if necessary.
: The inlet needle must be
replaced if a circular indentation
(arrow) is visible on the tip of its
sealing cone.
TS 410, TS 420
1
2
: Fit the inlet needle (1).
: Fit spring (2) in bore.
1 2 3
: First fit the spindle (2) of the inlet
control lever (3) at the seat
(arrow) of the spring, then slide
the clevis on the inlet control
lever into the groove on the inlet
needle (1).
Ensure that the spring locates on
the nipple of the inlet control lever.
– Press the inlet control lever down
and secure it with the screw.
– Check that the inlet control lever
moves easily.
– Install the metering diaphragm,
b 12.3.1.
– Reassemble remaining parts in
reverse order.

12.3.3 Fixed jet

– Remove the metering
diaphragm, b 12.3.1.
: Unscrew the fixed jet (1) with
a suitable screwdriver.
Take care not to damage the jet.
– Examine the fixed jet and replace
if necessary.
– Reassemble parts in reverse
order.

12.3.4 Pump diaphragm

– Remove the carburetor, b 12.2.
: Remove the screw (arrow).
1
81