Starting the Engine- Helicopter and Boat

Operation (continued)

8.Quickly flip the propeller in a counterclockwise direction according to the procedure described in the note above.

9.The engine should start after a few flips of the propeller.

10.Be sure to open the choke when the initial firing of the engine is heard.

11.When the choke is opened, be sure to close the throttle valve to a position near the idle position before the next flipping of the propeller is attempted.

CAUTION: If the engine is started when the throt- tle is wide open, a great thrusting force will be generated, which can be very dangerous.

12.If you do not use a chicken stick to start the engine, be sure to wear a thick glove when flipping the propeller and use all fingers, except the thumb, for the flipping operation.

13.Do not over-rev the engine. These engines are designed to develop maximum output with the standard muffler and the recommended propeller size. Please refer to the propeller chart on page 10 to confirm the proper propeller for the applicable Zenoah engine.

Starting the Engine— Helicopter and Boat

1.Fill the tank with fuel.

2.Push the priming bulb located on the carburetor until fuel appears in the priming bulb (for helicopter).

3.Choke the engine and open the throttle valve approxi- mately 1/3–1/2 of the full open position.

4.Quickly pull the starter cord until the initial firing of the engine is heard.

5.When the initial firing is heard, open the choke, set the throttle valve at the idle position or at the position slightly open from the idle position and quickly pull the starter cord a few more times until the engine starts.

6.For helicopter operation, you should adjust the rotor- pitch to obtain a 9,000 to 10,000 rpm of the engine at full throttle operation.

Stopping the Engine

The ability to shut down the engine in an emergency is extremely important. For stopping the engine, the black lead wire from the coil should be grounded to the engine

body, or the throttle valve should be closed completely. Installation of a “stop” or “kill” switch is recommended.

Red Lead

Black Lead

		Engine
	Kill Switch	Body
	Kill Switch	Ground
		Ground

Refer to the example shown in the following diagram.

Carburetor Adjustment

The carburetor is provided with three adjustment screws, which are factory set to the best (approximate) posi- tions. They may need minor adjustment, depending upon the temperature, humidity, atmospheric pressure (alti- tude), etc., of the area where the engine is being used.

High-Speed Needle

Low-Speed Needle

Idle Screw

1.Start the engine without making any adjustments.

2.Make adjustments only when the engine shows signs of inefficient operation.

3.Standard settings of each needle is as follows:

a.Low-Speed Needle: 11/8 plus/minus 1/4

b.High-Speed Needle: 13/8 plus/minus 1/4

Idle Screw: Turning this screw clockwise increases the idling RPM. Turning it counterclockwise decreases the idling RPM.

Low-Speed Needle: This is the fuel adjust screw (not the air screw). Turning this needle clockwise makes the gas mixture leaner, and turning it counterclockwise makes it richer.

Zenoah specifications

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APC Zenoah Starting the Engine- Helicopter and Boat, Stopping the Engine, Carburetor Adjustment

Models: Zenoah