O.S. engine MAX FXi 46, Owner'S Instruction Manual, Page: 20 / 28

basic setting can be re-established as
follows: Close the throttle rotor gradually
from the fully opened position until it is just
fully closed. (Do not turn further.) Then,
screw in the Mixture Control Screw until it
stops. Now unscrew the Mixture Control
Screw as indicated below.
Once the optimum needle-valve setting has
been established (see page 17, “NEEDLE-
VALVE ADJUSTMENT DIAGRAM”) the
procedure for starting may be simplified
as follows:
1. Open the needle valve one half-turn
(180°) from the optimum setting.
2. Set the throttle one-quarter open from the
fully closed position, energize the glow plug
and apply the electric starter. When the engine
starts, reopen the throttle and re-adjust the
needle valve to the optimum setting.
Note: When re-starting the engine on the
same day, provided that atmospheric
conditions have not changed
significantly, it may be practicable to re-
start the engine on its optimum
(running) setting.
Once the engine has been run-in and the
controls properly set up, it should be
unnecessary to alter the mixture settings;
except to make minor adjustments to the
Needle Valve occasionally, to take account
of variations in climactic conditions.
The use of a different fuel, however,
particularly one containing more, or less,
nitro methane and/or a different type or
proportion of lubricating oil, is likely to call
SUBSEQUENT READJUSTMENT
SUBSEQUENT STARTING PROCEDURE
20