O.S. Engines 21VG-PX - Manual (Page 11)

20
Turn the needle-valve clockwise until it stops. This
is the fully closed position. Do not force it to turn
further.
Metering needle is set at basic position.
(Refer to P28.)
Needle Valve
Open
Close (clockwise)
approx 0.5mm
The carburetor is set as shown below at the
factory. Start the engine as it is.
The needle-valve is set approx. 3 turns open from
the fully closed position.
Approx. 0.5mm open factory setting
Note
Check the throttle opening at idle before installing
an air cleaner. After the engine is started, be sure
to install an air cleaner.
21
Fuel
Deliver fuel into the carburetor.
Fuel tank side
If the fuel tank is equipped with a choke button, push
the button to send the fuel to the carburetor. If not,
apply an electric starter to send the fuel to the
carburetor.
Switch on the transmitter and make sure that each
linkage moves correctly.
Fuel tank
choke button
Note
If too much fuel is delivered into the engine, the
engine cannot be started due to over-priming.
In this case, refer to page 7 and TROUBLE
SHOOTING about over-priming.