O.S. engine MAX-32SX-H Series Owner's Instruction Manual page 16

This enables the full r.p.m. range, from idling to full
power, to be controlled by the throttle stick, and
then allows the engine to be stopped, from the
transmitter, by closing the throttle completely with
the trim lever.
Set up the throttle linkage as follows:
With the transmitter throttle trim lever fully
retarded, adjust the throttle servo linkage so that
the throttle rotor is (a) fully open when the
transmitter throttle stick is fully advanced and (b)
fully closed (i.e. engine stopped) when the stick is
fully retarded.The idling speed is then set by
advancing the throttle trim lever to the point where
the engine runs, steadily and reliably,at the
desired idling speed.
As a safety measure, first check the transmitter
B
controls, including the throttle stick and trim lever
positions, and hold the main rotor securely before
starting the engine.(Refer to page 13.)
C Warm the engine by allowing it to idle for about 30
seconds. If the engine stops, advance the throttle
trim lever slightly to increase the idling rpm. Then
open the throttle sufficiently to 'float' the model
above the ground.
lf, at this time, the engine is slow to pick up and
D
produces an excess of exhaust smoke, the mixture
is too rich. Correct this condition by turning the
Mixture Control Screw clockwise. lf the mixture is
extremely rich, engine rpm will become unstable :
opening the throttle will produce a great deal of
smoke and rpm may drop suddenly or the engine
may stop. This condition may also be initiated by
an excessively prolonged warming-up period.
E lf, on the other hand, the mixture is too Iean, this
wiIl be indicated by a marked lack of exhaust
smoke and a tendency for the engine to cut out
when the throttle is opened. ln this case, turn the
Mixture Control Screw counter-clockwise to enrich
the mixture.
F Turn the Mixture Control Screw 30 degrees at a
time.
Having provisionally set the idle mixture, the next
G
step is to adjust the mixture for hovering flight.
15