O.S. engine MAX-15 Owner's Instruction Manual page 16

Warning: When using a spinner assembly, make
sure that the notches in the spinner shell are
large enough to clear the propeller blades and so
do not cut into and weaken the blade roots.
Tighten the spinner nut firmly so that compression is
first felt as indicated (i.e. with blades horizontal) when
turning the propeller in the direction of arrow.
3 Filling the fuel tank
Do not allow fuel to overflow into
silencer when refuelling, otherwise
engine may become flooded and
difficult to start.
Re-connect
delivery tube
to engine after
tank is filled.
Fuel pump
Use a fuel can filter
(e.g. O.S. Super Filter).
Disconnect delivery tube
from the fuel inlet, and
connect it to the tubing
from the fuel pump.
Do not let dirt or
dust enter fuel can.
Fuel (model
glow-plug
engine fuel)
4 Opening and closing of the needle-valve
Turn needle-valve clockwise to close (for leaner mixture).
Turn needle-valve counter-clockwise to open (for richer mixture).
5 Setting the needle-valve
Open the needle-valve 3 turns (for 15LA-S), 1
25,40,46LA-S) in the direction of arrow from the closed
position.
Close
The position where the needle-valve stops is the fully closed
position. It may be convenient to remember the position of the
mark or set-screw at this time.
15
Close
Open
1
turns (for
2
Open