O.S. Engines 18TZ(S)-T - Manual (Page 19)

Element glows when energized,
Turn the needle-valve clockwise slowly until
it stops. This is the fully closed position.
Do not force to turn further.
Open the Needle-Valve
2 turns from the fully
closed position.
Close
Replace the plug when the
element does not glow or is
burnt out.
Glow Plug Igniter
In case of the 11 K carburetor
Set the throttle-stop screw so that the minimum
throttle opening (idle setting) is approximately
0.3-0.5mm.
In case of the 11 L carburetor
Set the throttle-stop screw so that the minimum
throttle opening (idle setting) is approximately
1.0mm.
Throttle Stop
Screw
approx
1mm
Note:
Throttle opening at idle should be checked
before fitting an air cleaner.
Pliers
Needle Valve
Open
18