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6. Set the throttle to a high idle. Set the propeller so that it is at the beginning of the
compression stroke.
7. Flip the propeller through compression rapidly. If this is done properly, the engine will
start after several brisk flips of the propeller.
8. After starting, let the engine idle for 30 to 45 seconds. Open and close the throttle
slowly until the engine runs smoothly at idle and at full throttle. Acceleration should also
be smooth. If acceleration is not smooth, adjustments to the carburetor may be
necessary (see Adjustment of the Engine.)
9. If your engine does not start, repeat steps 2-8.

B. Electric Starter Starting

A 12-24V electric starter is recommended to start the RCGF70cc twin.
1. Make sure you use a good quality, lightweight aluminum spinner.
2. Have someone help you hold the airplane while you start it.
3. Switch the ignition to ON, close the choke plate on the carburetor and open the throttle
slightly from the idle position.
4. Use your electric starter to turn the engine over for several seconds, until a popping
sound is heard. This indicates that the engine is firing.
5. Move the choke lever to the open position.
6. Set the throttle to high idle and use your electric starter to turn over the engine until it
starts.
7. After starting, let the engine idle for 30 to 45 seconds. Open and close the throttle
slowly until the engine runs smoothly at idle and at full throttle. Acceleration should also
be smooth. If acceleration is not smooth, adjustments to the carburetor may be
necessary (see Adjustment of the Engine).
8. If your engine does not start, repeat steps 2-7.

Engine Troubleshooting

If your engine fails to start after the preceding starting procedures
please check the following.

Symptom

Diagnosis

Fix

Engine does not fire

Ignition battery

voltage low

Charge or

replace battery

Battery wires faulty

or loose

Replace wires or

Re-connect/check

connections

Faulty spark plug

or not firing

Replace spark plug

or check for spark

Summary of Contents for 70CC-Twin

Page 1: ...ion system Power supply 4 8 8 4V Maximum Output 7 4HP 8600rpm Requires Gasoline 2 cycle oil ignition battery propeller speed rang 1500 8600rpm Gasoline Version Pre mixed Fuel 25 40 Gasoline 1 Recommen...

Page 2: ...quivalent dle Speed 1600 rpm min Static Thrust 34 2 lb 15 5 kg 328 ft 100 m altitude 30 9 lb 14kg 5 900 ft 1800 m altitude SPARE PARTS LIST 1 1pc RCGF 70cc twin cylinder Gas Engine 2 2pc RCGF Spark Pl...

Page 3: ...t may look good from the outside it may be cracked on the inside which may cause it to disintegrate while in use Do not use a nicked cracked or split propeller Keep foreign objects away from the prope...

Page 4: ...inside the engine compartment Doing so could cause radio interference Install all electronic radio devices at least 12 305mm away from the engine Caution Running the engine with a lean gas mixture wi...

Page 5: ...n or replace any damaged or missing parts before proceeding 2 Install the silicone wire cover over the pick up lead coming from the engine cut the excess silicon wire cover and connect the lead to the...

Page 6: ...ubing to secure this connection 5 Install the ignition kill switch and charge jack on the aircraft so that it is easily accessible from the outside of the plane 6 Install the ignition module securely...

Page 7: ...the included standoffs Use threadlocking compound such as Threadlocker on the screws where they thread into the blind nuts 3 Install the fuel tank in the airframe Use only gasoline approved fuel tank...

Page 8: ...operate the throttle 6 Connect the ignition wire from ignition module to the spark plug 7 Install the muffler onto the engine Be sure to use threadlocker and that the ignition wire does not contact t...

Page 9: ......

Page 10: ...om the aircraft Use the included propeller washer to mark the centering hole on the propeller 2 Once the location is established use a drill press with a 5 2055 5 21mm drill bit as a pilot hole Once t...

Page 11: ...Locator to center and start the hole 6 Remove the propeller from the engine and drill the outer hole on the drill press using a 110 2 81mm drill bit as a pilot hole Next use a 5mm drill bit to finish...

Page 12: ...peller using the same technique as step 6 9 Mount the propeller to the engine using the 5x35mm SHCS with 5mm lock washers and flat washers Be sure to use threadlocker Adjustment of the Engine Each RCG...

Page 13: ...eedle is as follows turn the needle to the fully stop closed position and then open the needle 2 turns It is recommended that the High speed needle be adjusted by the use of a tachometer to obtain max...

Page 14: ...during break in it s recommended that you run the engine without the cowling Also for safety reasons do not adjust the carburetor while the engine is running There are two recommended ways to start th...

Page 15: ...the carburetor and open the throttle slightly from the idle position 4 Use your electric starter to turn the engine over for several seconds until a popping sound is heard This indicates that the engi...

Page 16: ...pecially when checking for spark in this manner Optional Digital Tachometer not included An optional Digital Tachometer is available that can be directly connected to the ignition and display the RPM...

Page 17: ...RCGF 8 4 V Ignition modules use the Digital Tachometer...

Page 18: ...ailure to do so may result in miss calibration of the needle adjustments In order to do this it is necessary to remove the Phillips head screw which secures the carburetor filter cover and the carbure...

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Page 20: ...ice center on local Warranty Information The RCGF 70cc TWINs has a two year limited warranty through RCGF service center beginning at the date of purchase Please retain your receipt as your proof of p...

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