The Magnum XL .25ARNV thru .36ARNV engines are single cylinder, two
cycle engines incorporating ABC piston and sleeve technology for long
life and easy break-in. A dual needle carburetor for precise adjustments is
standard on all four engines. All four engines incorporate a cast aluminum
rear needle valve assembly for safety. The engine was designed by expert
engineers and built by master craftsmen using only the highest quality ma-
terials and CNC machinery. These qualities provide the long life and de-
pendability you have come to expect from an engine of this caliber.
INTRODUCTION
BECOMING FAMILIAR WITH THE MAGNUM
XL .25ARNV thru .36ARNV ENGINES
Before attempting to operate your new engine, please read through this
instruction sheet in it’s entirety. This will help you familiarize yourself
with the features and operation of your new engine. Use the photos below
to identify the major component parts of your new engine.
SPECIFICATIONS
WARNING!
Magnum model engines will consistently give you dependable performance
and reliability and will be a source of satisfaction and pleasure if you fol-
low these instructions as to the engine’s 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 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 pre-
cautions while using it. Please read the safety warnings below carefully.
N
Keep spectators, especially small children, at least 20 feet away from
the engine while it is running.
N
Mount the engine securely in the airplane or on a suitable engine test
stand to run the engine. Follow the mounting instructions in your kits’ in-
struction manual or on the plans for individual mounting recommendations.
Do not clamp the engine in a vise to test run it.
N
Use the recommended size propeller and follow the proper procedure
for mounting the propeller. Use the correct size wrench to tighten the
propeller nuts. Do not use pliers.
N
Inspect the spinner, propeller and propeller nut on a regular basis,
looking for any signs of nicks, cracks or loosening.
N
To stop the engine, adjust the throttle linkage to completely close the
throttle barrel and therefore cut off the air supply. You can also pinch the
fuel line to stop the engine, but only if it is safely accessible. Do not throw
anything into the spinning propeller or attempt to use your hands to stop
the engine.
N
Stand behind the engine while it is running to make any adjustments
to the mixture controls. Do not reach over or around the propeller. Do not
lean towards the engine. Do not wear loose clothing or allow anything to
be drawn into the spinning propeller while the engine is running.
N
If you need to carry your model while the engine is running, be con-
scious of the spinning propeller. Keep the airplane pointed away from you
and others at all times while the engine is running.
N
Do not use tight fitting cowls or oversized spinners as these can im-
pede airflow over the engine and result in overheating and possible severe
damage to the engine.
INSTALLATION
q
Engine Orientation
The Magnum XL .25ARNV - .36ARNV engines can be orientated in any posi-
tion on the firewall. Keep in mind that when the engine is mounted inverted,
carburetor adjustments will need to made differently and the fuel tank may
need to be lowered. (See tank size and orientation to carburetor on next page).
OPERATING INSTRUCTIONS
XL .25A
RNV
- .28A
RNV
and
XL .32A
RNV
- .36A
RNV
XL .25
XL .28
XL .32
XL .36
Displacement (cc)
Bore (mm)
Stroke (mm)
Practical R.P.M.
Weight (w/Muffler)
Crankshaft Thread
1/4 - 28
1/4 - 28
1/4 - 28
1/4 - 28
(XL .36A
RNV Shown)
Pressure Nipple
Muffler
Exhaust Cone
Carburetor
Prop Washer
Prop Nut
Crankshaft
Thrust Washer
Cylinder Head
Needle Valve
Detent Spring
Needle Valve
Mount
Fuel Nipple
Crankcase
Carburetor Retaining Bolt
Throttle Arm
Muffler Thru Bolt
Fuel
Nipple
Throttle
Arm
Idle Mixture
Screw (inside
throttle arm)
Rotor
Bolt
Fuel
Nipple
Rotor
Bolt
Throttle
Arm
Idle
Mixture
Screw
Idle Stop
Screw
(XL .28A
RNV Shown)
(XL .36A
RNV Shown)
4.05
4.57
5.26
5.81
17.42
18.5
19.5
20.5
8.5
8.5
8.8
8.8
2,000 - 16,000
2,000 - 16,000
2,000 - 16,000
2,000 - 16,000
11.2
10.8
12.3
12
