How do you control the speed of the engine on a cox model airplane engine?

How is it hooked up the remote controll? Is there a small electric moter pulling on the throttle cabel?How do you control the speed of the engine on a cox model airplane engine?
yes a servo that opens and closes the carbHow do you control the speed of the engine on a cox model airplane engine?
When you set the air fuel mixture on the gas tank set it to 3 1/2 turns counter clock wise. Then from there once you get you engine started turn the needle clock wise to make the engine run faster RPM's and conter clockwise to make the engine run slower RPM's.

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