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RCGF 70CC-Twin Operator's Manual
(note: the spare parts list and dimension of engine are in the end of manual)
RCGF 70cc twin
Parameter:
Type : 2 cycle piston valve type gasoline engine for airplane
Piston displacement Cylinder (cc) : 70cc(4.27 cu.in)
Bore x Stroke (mm): 1.53 in(39mm) x 1.18 in (30mm)
Carburetor : RCGF
Ignition : DC-CDI (Computer Controlled auto advance, electronic ignition 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 , Recommend:30:1
(90% high otcane unleaded gasoline, Import gas into carbon fiber installations valves)
Lubrication Oil : 2 cycle engine oil
Suggested Propellers: 22×10, 23×8, 23×10,24X8
Suggested Break-in Prop: 23X10
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.
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Summary of Contents for RCGF 70CC-Twin
- Page 1 Lubrication Oil : 2 cycle engine oil Suggested Propellers: 22×10, 23×8, 23×10,24X8 Suggested Break-in Prop: 23X10 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.
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Page 2: Spare Parts List
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 Plugs (NGK CM6 size) (3) 2pcs Mufflers with gasket and bolts (M5X20 mm) (4) 4pcs stand offs and M5X45mm bolts... - Page 3 ● 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.
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Page 4: 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. - Page 5 than listed. 1. Check to see that all screws and bolts are tight. Check carefully for any cracks, broken, or missing parts. Tighten 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 pick–up lead from the Electronic Ignition Module.
- 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 70cc twin cylinder engine on Your Airplane Note: The RCGF 70CC 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 70cc twin onto a firewall thinner than specified because it may fail due to the power of the engine.
- Page 8 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 to use a non-metallic linkage.
- 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 4. Place the propeller on the crankshaft at the one o’clock position. 5. Mark the location of one of the outer holes while the propeller is in the beginning of the compression stroke position. Use a Dead Center Hole Locator to center and start the hole.
- 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...
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Page 13: Ignition Timing 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
There are two recommended ways to start the RCGF 70cc twin: A. Manual Starting Note: When hand starting the RCGF 70cc twin, 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 15: Engine Troubleshooting
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. - Page 16 Digital Tachometer. 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.
- Page 17 RCGF 8.4 V Ignition modules use the Digital Tachometer...
- 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...
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Page 20: Warranty Information
If you need carburetor spare parts please contact our service 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 purchase.
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