RCGF 120CC-Twin Operator's Manual
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RCGF 120CC-Twin Operator's Manual

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RCGF 120CC-Twin Operator's Manual
(note: the spare parts list and dimension of engine are in the end of manual)
RCGF 120cc twin
Parameter:
Type : 2 cycle piston valve type gasoline engine for airplane
Piston displacement Cylinder (cc) : 120cc
(7.32 cu in)
Bore x Stroke (mm): 1.85 in(47mm) x 1.38 in (35mm)
Carburetor : RCGF
Ignition : DC-CDI (Computer Controlled auto advance, electronic ignition system)
Power supply: 4.8-8.4V
Maximum Output :12.5HP /7600rpm
Requires: Gasoline, 2-cycle oil, ignition battery & propeller
speed rang : 1500-7600rpm
Gasoline-Version : Pre-mixed Fuel, 25-40 (Gasoline):1 , Fuel:87-93 Octane
Gasoline,Recommend:30:1
(90% high otcane unleaded gasoline, Import gas into carbon fiber installations valves)
Lubrication Oil : 2 cycle engine oil
Propeller : 27X10 6580 rpm (Standard Two leafs prop)

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Summary of Contents for RCGF 120CC-Twin

  • Page 1 RCGF 120CC-Twin Operator’s Manual (note: the spare parts list and dimension of engine are in the end of manual) RCGF 120cc twin Parameter: Type : 2 cycle piston valve type gasoline engine for airplane Piston displacement Cylinder (cc) : 120cc (7.32 cu in)

  • Page 2: Spare Parts List

    26X10,26X12,27X10,28X10 Suggested Break-in Prop: 26X10 Sparking plug: NGK CM6 Type Cooling System : Air Cooled RCGF engine package Includes: electronic CDI ignition, muffler, spark plug, gaskets, bolts, throttle arm extension & manual. Weight : Engine: 5.69 lb (2580 g) 2XMuffler: 7.05 oz (200g) Ignition Module: 5.11 oz (145 g)

  • Page 3: Safety Tips And Warnings

    Safety Tips and Warnings ● This engine is not a toy. Please place your safety and the safety of others paramount while operating. RCGF will not be responsible for any safety issues or accidents involving this engine. ● Operate the engine in a properly ventilated area.
  • Page 4 use a petroleum based 2-cycle motor oil like Lawn Boy All Season – Ashless, Generation II oil for the break- in period. Break-in should be considered about the first 3-5 gallons you run the engine. A high quality synthetic 2-cycle oil is recommended for optimum performance and a longer engine life.

  • Page 5: Installation Instructions

    ● To avoid permanent damage to the electronic ignition system, never rotate the propeller on your RCGF engine with the electronic ignition system switched on and the plug not installed in the plug cap. Installation Instructions Prepare the engine for installation Before beginning installation it’s a good idea to plan location of the various components...
  • Page 6 3. Connect the kill switch lead to the red connector from the ignition control module using the lead from the kill switch or with the included three pin connector with pig tail. Use one of the included three pin securing clips to secure the connection. 4.
  • Page 7 Installing the RCGF 120cc twin cylinder engine on Your Airplane Note: The RCGF 120CC twin must be installed on at least a 9.5mm [3/8”] thick 5-phy plywood firewall.The firewall must be securely glued to the airplane. Use triangle stock and pin the firewall with hardwood dowels to reinforce the firewall glue joints. Never install the RCGF 120cc twin onto a firewall thinner than specified because it may fail due to the power of the engine.
  • Page 8 is pointed down. 4. Install the throttle servo at least 12” [305mm] away from the engine. Make sure that you get the carburetor’s full range of rotation with your servo travel. Be sure to use a non-metallic linkage. 5. Install the choke servo (optional) at least 12” [305mm] away from the engine. Be sure...
  • Page 9 to use a non-metallic linkage. A high torque metal gear servo is recommended to 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 the muffler.
  • Page 10 Drill and Install the Propeller The easiest way to drill the propeller to fit the hub is to use a drill guide. If you do not have a drill guide, you can use the following method to drill your propeller. Most propellers within the recommended size range have a 0.393"...
  • Page 11 2. Once the location is established, use a drill press with a #5(.2055” / 5.21mm) drill bit as a pilot hole. Once the pilot hole is established, use a 0.393"(10mm) drill bit to finish the hole. In order to achieve a clean opening on both sides of the propeller, drill only half way through the propeller with the finishing drill bit.
  • Page 12 Be sure to use threadlocker. Adjustment of the Engine Each RCGF Engine has been factory preset. However, differences in elevation will influence the performance of the carburetor. To obtain optimum output of the engine, slight adjustment of the carburetor may be necessary...

  • Page 13: Idle Adjustment

    1. Choke Control (the choke control should be used when the engine is cold) 2. Throttle 3. Idle Adjustment Screw (adjust the idle speed) 4. (L) Low-speed Needle (adjusts the fuel/air mixture at low speeds) 5. (H) High-speed Needle (adjusts the fuel/air mixture at high speeds) Idle Adjustment Turning the Idle Adjustment Screw clockwise will increase the idle speed.

  • Page 14: Starting Procedures

    Also, for safety reasons do not adjust the carburetor while the engine is running. There are two recommended ways to start the RCGF 120cc twin: A. Manual Starting Note: When hand starting the RCGF 120cc twin, use a thick glove or heavy duty starter stick to protect your hand.

  • Page 15: Engine Troubleshooting

    1. The propeller should be installed on the drive washer at the one o’clock position and at the beginning of the compression stroke so that it’s comfortable to flip it through compression. 2. Have someone help you hold the airplane while you start the engine. 3.
  • Page 16 Battery wires faulty Replace wires or or loose Re-connect/check Engine does not fire connections Replace spark plug Faulty spark plug or check for spark or not firing Remove plug, disconnect fuel Engine flooded line, rotate prop to remove fuel Check for: a) fuel in tank Engine starts,then rpm b) fuel tubing...
  • Page 17 Many of the RCGF 8.4 V Ignition modules have an additional lead to plug into the Digital Tachometer. If your 6.V old ignition module does not have this additional lead, the Digital Tachometer can still be used. Simply use the Y-harness (included with the Digital Tachometer) to connect to the pick-up lead from the engine.
  • Page 18 Engine Maintenance Please clean the fuel filter in the RCGF Carburetor periodically. Failure 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...

  • Page 20: Warranty Information

    If you need carburetor spare parts please contact our service center on local. Warranty Information The RCGF-120cc 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 purchase.

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