RCGF 20cc SBM Operator's Manual
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RCGF 20cc SBM Operator's Manual

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RCGF 20cc SBM Operator's Manual
(note: the spare parts list and dimension of engine are in the end of manual)
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RCGF 20cc SBM

Parameter:

Type : 2 cycle piston valve type gasoline engine for airplane
Piston displacement Cylinder (cc) : 20cc
(1.22 cu in)
Bore x Stroke (mm): 1.3 in(32mm) x 9.5 in (24mm)
Carburetor : RCGF
Ignition : DC-CDI (Computer Controlled auto advance, electronic ignition system)
Power supply: 4.8-8.4V
Maximum Output :2.8HP /2.1KW
Requires: Gasoline, 2-cycle oil, ignition battery & propeller
speed rang : 1500-10500rpm
Gasoline-Version : Pre-mixed Fuel, 25-40 (Gasoline):1 , Recommend:30:1

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Summary of Contents for RCGF 20cc SBM

  • Page 1: Parameter

    RCGF 20cc SBM Operator’s Manual (note: the spare parts list and dimension of engine are in the end of manual) ------------------------ RCGF 20cc SBM Parameter: Type : 2 cycle piston valve type gasoline engine for airplane Piston displacement Cylinder (cc) : 20cc (1.22 cu in)
  • Page 2 Suggested Propellers: 14x10, 15x8, 16x6, 16x8, 17x6 Sparking plug: NGK CM6 Type Cooling System : Air Cooled electronic CDI ignition, muffler, spark plug, gaskets, bolts, RCGF engine package Includes: throttle arm extension & manual. Weight : Engine: 1.44 lb (654g) Muffler: 2.1 oz (59g)

  • Page 3: Spare Parts List

    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 ● Never start the engine on loose gravel or sand. ● Do not attempt to stop the engine by throwing anything into the path of the propeller. ● Make sure the fuel line is well-secured to the engine and to the fuel tank so that it won’t come off in flight.

  • Page 5: Gas/Oil Mixing Chart

    ● 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.
  • Page 6 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 pick–up lead from the Electronic Ignition Module. Secure the connection with the included three pin connector securing clip.
  • Page 7 ------------------------ Installing the RCGF 20cc SBM on Your Airplane Note: The RCGF 20CC SBM must be installed on at least a 6mm [1/4”] 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.
  • Page 8 Note: Please remember to remove the prop washer(S2024) and the small blind nut, when you mount the adapter nut in your 20cc SBM engine. 1. Select an engine mount. A two-piece engine mount that does not interconnect or overlap at the firewall is preferred for the RCGF 20cc SBM 2.
  • Page 9 7. Install the throttle servo as far as possible from the engine. Make sure that you get the carburetor’s full range of rotation with your servo travel. If needed, use the included Long Throttle Arm Extension. Be sure to use a non-metallic linkage through an outer pushrod tube and a screw lock connector so that the linkage is adjustable.
  • Page 10 8. Once the throttle servo is installed it’s a good idea to deactivate the throttle return spring with a pair of needle nose pliers. Gently grab the spring and remove it from tension on the throttle lever. Deactivating the spring will remove the load or stress on the throttle servo.
  • Page 11 ------------------------...

  • Page 12: Install The Propeller

    Install the Propeller 1. It is recommended that you test-run, tune, and break-in the engine before flying. To make this easier we recommend that you remove the cowling. 2. Set the engine near the beginning of the compression stroke. Note the position of the ignition magnet with the engine inverted.

  • Page 13: Adjustment Of The Engine

    5. Install the spinner cone. Be sure to use thread locker on the spinner bolt. ------------------------ 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,...

  • Page 14: Idle Adjustment

    slight adjustment of the carburetor may be necessary. Engine Functions and Adjustments 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.

  • Page 15: Ignition Timing Adjustment

    Ignition Timing Adjustment The ignition timing is preset on the RCGF20cc at 28-30° before Top Dead Center (TDC). The ignition timing can be advanced or retarded by loosening the ignition sensor Phillips head screws and sliding the sensor to the full extent clockwise (32° advancing the ignition) or counter clockwise (26°...

  • Page 16: Starting Procedures

    There are two recommended ways to start the RCGF 20cc: A. Manual Starting Note: When hand starting the RCGF 20cc, use a thick glove or heavy duty starter stick to protect your hand. 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...

  • Page 17: Engine Troubleshooting

    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.
  • Page 18 Digital Tachometer. Many of the RCGF Ignition modules have an additional lead to plug into the Digital Tachometer. If your ignition module does not have this additional lead, the Digital...

  • Page 19: Maintenance

    Digital Tachometer or leads on the aircraft used. 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 carburetor filter gasket.

  • Page 20: Warranty Information

    If you need carburetor spare parts please contact our service center on local. ------------------------ Warranty Information...
  • Page 21 The RCGF-20 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. Contact Us www.rcgfengine.com www.rcgfservice.com...

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