Magnum two-cycle gasoline model airplane engines will consistently give you dependable
performance and reliability and will be a source of satisfaction and pleasure if you follow these
instructions as to the engines proper and safe use. You alone are responsible for the safe operation of
your engine, so act sensibly and with care at all times.
This Magnum model airplane engine is not a toy. It is a precision built machine whose power is
capable of causing serious injury to yourself and others if abused, misused or if you fail to observe
proper safety precautions while using it. Keep spectators, especially small children, at least 20 feet
away from the engine while it is running. Mount the engine securely in the airplane or on a
suitable engine test stand to run the engine. Follow the mounting instructions in your kit ’s
instruction manual or on the plans for individual mounting recommendations. Do not clamp the engine
in a vise to test-run it.
Always use high -quality steel cap screws and washers to mount the engine to your airplane.
Use the recommended size propeller and follow the proper procedure for mounting the propeller. Use the
correct size wrench to tighten the propeller nut. Do not use pliers. Always balance your propeller before
mounting it.
Inspect the spinner, propeller and propeller nut on a regular basis, looking or any signs of nicks, cracks or
loosening.
To stop the engine, adjust the throttle linkage to completely close the throttle barrel and therefore cut off the
fuel/air supply. You can also use the included kill switch to stop the engine. Do not throw anything into the
spinning propeller or attempt to use your hands to stop the engine.
While the engine is running, sta nd behind the engine to make any adjustments to the carburetor. Do
not reach over or around the propeller. Do not lean toward the engine. Do not wear loose clothing or allow
anything to be drawn into the spinning propeller while the engine s running. If yo u need to carry your model
while the engine is running, be conscious of the spinning propeller. Keep the airplane pointed away from
you and others at all times. Do not use tight-fitting cowls over the engine. They can restrict air from
flowing
over the engine which could result in engine damage from overheating. When mixing gasoline with the required amount of
two -cycle oil, always do so in a well-ventilated area. To prevent unwanted RF interference, always keep any part of
the radio control system (servos, receiver, flight battery, antenna, etc) preferable 12 inches away from the
ignition module. Always run the engine in a well-ventilated area.
Engine Orientation
The 46cc gasoline engine utilizes a high-quality Walbro carburetor with an integrated fuel pump so the
engine can be orientated in any position on the firewall without the fuel-draw problems usually
associated with non-pumped engines.
Engine Bolts & Firewall Requirements
The engine utilizes a heavy-duty machined aluminum back plate engine mount that should be
mounted to the plywood firewall in your model. The firewall in your model should be aircraft grade 5-
ply plywood no less than 3/8” thick and the firewall should be reinforced to meet the torque and weight
of the engine. Use only high-quality steel cap screws and related hardware to mount the engine.
Should you decide to mount the engine using rubber shock mounts we strongly suggest using high-
quality mounts designed specifically for single cylinder gasoline engines. Using the wrong type of
rubber shock mounts can lead to an erratic running engine and possible engine damage.
Engine Installation
Caution Please Read
