O.S. engine Max-37SZ-Hring Owner's Instruction Manual page 14

ADJUSTING CHART
A
Open the Needle Valve 1.5 turns from the fully closed position.
Make sure that the Mixture Control Valve is at the factory setting.
B Start the engine
Warm up the engine
C
Observe the mixture condition while "floating" the model
Lean mixture
E F
Turn the Mixture
Control Valve
Idling OK
counter-clockwise
G
Observe the hovering mixture condition
Lean mixture
I
Open the
Needle Valve
Hovering OK
(Turn counter-clockwise)
J
Land the model
K
Idle for approx: 10 seconds, then reopen throttle to
observe transition ("Float" the model)
Lean mixture
Turn the Mixture
Control Valve
Idle OK
counter-clockwise
L
High Speed Flight
Lean mixture
Open the
Needle Valve
High Speed Flight OK
(Turn counter-clockwise)
M N
Fine tuning of hovering mixture
Response too sensitive Response too slow
P Q
Hovering OK
Turn the Needle Valve
2 or 3 clicks counter-
clockwise, or turn the
Adjustment completed
Mixture Control Valve
10-20 degrees counter-
clockwise. Adjust pitch
control characteristics.
Rich mixture
D E
Turn the Mixture
Control Valve
clockwise
Rich mixture
H
Close the
Needle Valve
(Turn clockwise)
Rich mixture
Turn the Mixture
Control Valve
clockwise
Rich mixture
Close the
Needle Valve
(Turn clockwise)
O Q
Turn the Needle Valve
2 or 3 clicks clockwise,
or turn the Mixture
Control Valve 10-20
degrees clockwise.
Adjust pitch control
characteristics.