O.S. Engines 61RX-H WC - Manual (Page 21)

ADJUSTING CHART
High Speed Needle Valve - 2 turns opened from fully closed position.
Medium Speed Needle Valve - 1 turns opened from fully closed position.
Idle Mixture Control Screw - 2 turns opened from fully closed position.
Start the engine
Warm up the engine
Observe the mixture condition while "floating" the model
Turn the Idle Mixture
Control Screw
counter-clockwise
Idling OK
Turn the Idle Mixture
Control Screw
clockwise
Lean mixture Rich mixture
Observe the hovering mixture condition
Open the High Speed
Needle Valve
(Turn counter-clockwise)
Hovering OK
Lean mixture Rich mixture
Close the High Speed
Needle Valve
(Turn clockwise)
Land the model
Idle for approx: 10 seconds, then reopen throttle to
observe transition ("Float" the model)
Idling OK
Lean mixture Rich mixture
High Speed Flight
Lean mixture Rich mixture
High Speed Flight OK
Fine tuning of hovering mixture
Open the Medium
Speed Needle Valve
Hovering OK
Adjustment completed
Turn the Idle Mixture
Control Screw
counter-clockwise Turn the Idle Mixture
Control Screw
clockwise
Open the High Speed
Needle Valve
(Turn counter-clockwise) Close the High Speed
Needle Valve
(Turn clockwise)
Fine tuning of idling mixture
Lean mixture Rich mixture
Turn the Idle Mixture
Control Screw
counter-clockwise Turn the Idle Mixture
Control Screw
clockwise Idling OK
Lean mixture Rich mixture
Close the Medium
Speed Needle Valve
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