RCGF 120CC-Twin Operator's Manual page 7

that a thin piece of foam rubber is placed between the module and the mounting surface
and that Velcro ® is used to hold the module in place.
7. Secure all connections with heat shrink tubing (not supplied)
8. Install the silicone ignition wire cover over the ignition wire to the spark plug.
9. Install the spark plug into the engine cylinder (7-8lbs torque).
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.
Note: The length of the engine from the back on the engine mount to the face of the
propeller washer is 172 mm
1. Please check engine size chart (on the back cover of this manual) to drill the engine
mounting bolt holes.
2. Install (4) 5mm blind nuts (not included) into the back side (non-engine side) of the
firewall. Install the engine to the firewall using(4) 5x45mm SHCS with 5mm lock washers
and flat washers(not included) with 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 and (3.175
mm) fuel lines and a gasoline approved stopper. One line should go to the carburetor and
the other is to be used as a vent (a vent line is simply an open ended fuel line from the
fuel tank which exits the engine compartment or the fuselage; most vent lines exit at the
bottom of the firewall).You can fill the tank by using the carburetor line as fill line if you
have access to it or install a third line to be used as fill line. Installing a third line is the
cleanest and easiest way to add fuel. An alternative fueling set up is a 2-line system with
a T-fitting approved for gasoline use. Be sure to use a filler plug with either a 2 line or 3
line set-up. It's a good idea to add an extension to the vent line as shown, that goes up
and to the rear of the tank. This helps to avoid draining fuel from the tank when the model