Pilotage RC11937 [9/22] Engine maintenance
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Pilotage RC11937 [9/22] Engine maintenance

Pilotage RC11936 [9/22] Engine maintenance
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7
The factory default mixture settings are:
1&1/2 turns out for the low speed adjustment needle (See No. 4)
1&3/4 turns out for the high-speed adjustment needle (See No. 5).
Rotating the needle in a counterclockwise direction makes the fuel mixture richer (less lean).
Rotating the needle in a clockwise direction makes the fuel mixture more lean (less rich).
Carburetor mixture adjustment starts with the low speed adjustment needle. The low speed needle should be set such that the
transition from idle to full throttle is smooth even if the throttle is suddenly moved to full power. This will likely result in a slightly
rich idle mixture but you’re better o with a slightly rich mixture that than experiencing unstable acceleration. If the engine dies
when the throttle is advanced, the mixture is likely too lean. If the engine sputters when the throttle is advanced, the mixture is
likely too rich.
Since the low speed mixture has some eect on high-speed mixture, always adjust the high speed needle after adjusting the low
speed needle. The high speed needle is properly adjusted when the engine can reach maximum rpm while in the air, which is usu-
ally slightly richer than when it is on the ground. Rotating the needle in a counterclockwise direction makes the fuel mixture richer
(less lean). Rotating the needle in a clockwise direction makes the fuel mixture more lean (less rich). A general rule of thumb is to
richen the mixture from the maximum on the ground rpm by about 200rpm. If ever the engine slows or dies while at full throttle,
the high-speed mixture is too lean and you should adjust the mixture to make it more rich as it is possible that damage can result.
NOTE:
Be careful not to turn the mixture screws in too far as damage to the screw and/or carburetor body may result. Also, don’t be
tempted to run an overly rich mixture. Gas engine lubrication comes from the oil concentration in the gas, not from a rich fuel/air
mixture. If you want more lubrication, you can vary the oil mix ratio. A too rich a mixture will only result in poor engine performance
and a fouled plug and combustion chamber.
Turning the Engine Off
When you have completed your ight and landed your model turn o the engine o by reducing the throttle control stick to the
minimum position (all the way down). The engine should at this point idle. After this, reduce the throttle trim lever on your Tx from
the central position to the fully down position and the engine should cut o. Do not attempt to turn o the motor by preventing
air ow to the muer or by trying to access the ignition on/o switch.
Engine Maintenance
Fuel Tubing
Fuel tubing throughout the fuel system should be changed periodically and should never allow any air to enter the system. If your
gas line starts to get hard, soft or changes color, there’s a good chance it needs to be replaced. Keep in mind that the tubing inside
your tank deteriorates more quickly than anywhere else in the system.
Engine Housing
The exterior of the engine should be kept clean and inspected regularly. As the engine is usually tucked away inside the cowling,
nuts and bolts may loosen on the motor. If not regularly inspected the engine may lose parts while in ight and cause malfunctions.
Carburetor
Dirt and dust inside the cowl area will nd its way into the carburetor. The cowling should be kept clean and free of dirt build
up. The carburetor fuel screen should be cleaned periodically also. Carefully remove the pump cover (inlet on the side of the
carburetor), gasket and pump membrane. The screen will be visible and can be cleaned after careful removal. If the carburetor ever
seems to need frequent mixture adjustment or behaves as if it is starving for fuel, a dirty screen is a likely candidate for a cause. The
carburetor should be inspected, cleaned or reconditioned with every ying season or after being stored for a long period of time.
Spark Plug
The spark plug should be inspected, cleaned and gapped periodically. Replace it if it is fouled or worn. Installing a new plug with
every new ight season is a worthwhile maintenance precaution.
Propeller and Engine Mounting
Prior to using the engine, please check the aircraft propeller and the engine frame etc. carefully ensuring that the screws and nuts
are xed. When you install the engine, be sure to apply Threadlocker 242 (RC10299) to securely x the screws and nuts.

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