Stihl SR 450 - Adjusting Carburetor Screws

68 SR 430, SR 450
– Check operation.
: Rotate the choke shaft. The
lever (1) must engage the throttle
lever (arrow).
– Reassemble all other parts in the
reverse sequence.
9.6.6 Rotary Knob
: Take out the screw (arrow).
– Pull off the rotary knob (1).
: Remove the spring (1).
0002RA255 TG
1
0002RA256 TG
1
0002RA257 TG
1
Installing
– Turn the rotary knob (1) until it is
seated in the guide sleeve (2).
– Fit the spring (1) on the choke
shaft.
– Position the rotary knob (2) so
that the holes (arrows) are in
alignment.
: Push the rotary knob (2) onto the
choke shaft until it engages, and
hold it in that position.
0002RA258 TG
1
0002RA259 TG
1
2
: Insert screw (arrow) and tighten it
down firmly.
– Check operation.
– Press the rotary knob = the knob
can be rotated 2 notches
clockwise.
– Turn the rotary knob back to the
stop = it springs back to its
original position
– – knob is locked.
– Reassemble all other parts in the
reverse sequence.
0002RA260 TG