Stihl SR 430 - 9.7 Adjusting the Carburetor; 9.7.1 Basic Setting

69SR 430, SR 450
9.6.7 Adjusting Screws
There are three adjusting screws on
the carburetor:
H = high speed screw (1)
L = low speed screw (2)
LA = idle speed screw (3)
If the carburetor cannot be adjusted
properly, the problem may be the
adjusting screws.
The high speed screw (H) has a
limiter cap, which has to be
removed before the screw is
removed.
Always install a new limiter cap.
– Remove the shroud, b 4.4
It is not necessary to remove the
carburetor to remove and install the
adjusting screws. For the sake of
clarity, however, the illustrations
show the carburetor removed from
the machine.
– See also carburetor
troubleshooting, b 3.4
0002RA261 TG
1
2
3
Low Speed Screw (L)
: Take out the low speed
screw L (1).
: Inspect the tip (arrow) for
damage or wear and replace the
low speed screw (L) if necessary.
Installing
– Carefully turn the low speed
screw (L) clockwise as far as
stop.
– Check the high speed screw (H)
and replace it if necessary.
– Carry out the basic setting,
b 9.7.1
0002RA262 TG
1
533RA367 TG
High Speed Screw (H)
: Use puller 5910 890 4501 to pry
the limiter cap (1) off the high
speed screw (H).
Do not re-install a used cap –
always fit a new cap.
: Take out the high speed
screw H (1).
: Inspect the tip (arrow) for
damage or wear and replace the
screw (H) if necessary.
0002RA263 TG
1
0002RA264 TG
1
296RA267 TG