User Manual

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4
The break-in process allows the engine parts to perfectly fit each other and
properly protect each part from premature wear. The engine should be
broken in using a fuel that contains no more than 10% nitro methane and no
less than 20% Castor Oil lubricant. Synthetic lubricant fuels should not be
used during the break-in procedure. For the break-in procedure we
recommend mounting the engine into the airplane it will be used in. This
way the muffler, fuel tank and throttle linkage can all be tested in combination
with the engine. If your airplane uses a cowling, it should be removed during
the break-in procedure.
❑ 1) Turn the high speed needle valve out 2-1/2 turns from the fully closed
position.
❑ 2) If you are using an electric starter to start the engine, follow the
procedure in the previous section. If you are starting the engine by hand,
follow that procedure in the previous section.
❑ 3) Open the throttle barrel to approximately 1/4 throttle. Connect the
power to the glow plug. Start the engine using an electric starter or by hand.
If starting by hand you will need to vigorously flip the propeller through the
compression stroke several times before the engine will start.
❑ 4) Once the engine starts, open the throttle barrel to about 1/2 throttle.
You may need to lean the high speed needle valve in about 1/4 turn to keep
the engine running at half throttle.
❑ 5) After the engine has been running about 1 minute, remove the power
from the glow plug and slowly advance the throttle barrel to full throttle.
Adjust the high speed needle valve so that the engine is running very rich.
You should notice excessive white smoke coming from the exhaust. Let the
engine run for approximately 10 minutes then stop the engine.
❑ 6) Let the engine cool for approximately 10 minutes then restart it. Set
the high speed needle valve mixture to a slightly leaner setting, about 1/4
turn more in. Let the engine run for about 5 minutes at this setting, then stop
the engine and let it cool for approximately 10 minutes.
❑ 7) Repeat the procedure in step # 6, while leaning the needle valve slightly
more each time. In all, you should run the engine about a total of 30 minutes
of actual running time. After 30 minutes of run time the engine is ready for
flight. Fly the airplane with the engine set as rich as possible, but with
adequate power to fly the airplane. After each flight, lean the mixture slightly.
Continue to do this for about 5 flights. At this point the engine should hold a
good setting on the high speed needle valve and you can begin to fine tune
the needle valve settings to increase performance.
OPTIMIZING THE MIXTURE SETTINGS
Now that your engine is broken in, you can set the high and low speed needle
valves for optimum performance.
WARNING Be careful never to lean the engine out too much. Remember
that the lubricants for your engine are suspended in the fuel. If you lean out
the fuel mixture too much you will also be lowering the amount of lubricant
entering your engine. Less lubricant means more chance of your engine
overheating and possible engine failure.
Setting the High Speed Needle Valve
❑ 1) Start the engine and remove the power from the glow plug. Allow
the engine to warm up for about 1 minute.
❑ 2) After the engine has warmed up, slowly lean the high speed mixture
until the engine reaches peak rpm. After reaching peak rpm, richen the
mixture slightly until an audible drop in rpm is heard. If you are using a
tachometer this should be between a 200 - 300 rpm drop.
❑ 3) With the engine running at full power, carefully lift the nose of the
airplane about 45º into the air. The mixture should not become too lean, but
you may hear a slight increase in rpm. If the engine sags, or loses rpm when
you hold the nose up, the mixture is too lean. If this is the case, slightly
richen the mixture and follow the test once more.
IMPORTANT Rpm will increase about 10% - 30% in the air. This is due to
the forward motion of the aircraft as it is flying. Because of this more air is
entering the carburetor, at a higher force, which causes the mixture to lean
out. Additionally, as the fuel level in the fuel tank goes down, fuel draw
becomes more difficult for the engine, especially during aerobatics, thus
causing the mixture to go lean. It is imperative that you set the mixture rich
while on the ground to compensate for the leaning tendencies that will
happen in the air. Always watch the exhaust during your flight. The engine
should leave a noticeable white smoke trail at all times. If there is no smoke
trail, the engine is running too lean. You should land immediately and reset
the mixture.
Setting the Low Speed Needle Valve
❑ 1) Start the engine and lean out the high speed needle valve as per the
previous steps. Close the throttle until the slowest reliable idle is reached.
Allow the engine to idle for about 30 seconds.
❑ 2) Quickly advance the throttle to full. If the engine just stops running as
soon as the throttle is advanced, the idle mixture is too lean. With the
engine stopped, richen the idle mixture about 1/8 of a turn.
❑ 3) Repeat steps # 1 and # 2 until the engine will transition from idle to full
throttle smoothly. Minor hesitation in the transition is normal.
❑ 4) If you quickly advance the throttle from idle to full and the engine seems
to be very rich during transition (i.e., lots of smoke coming from the exhaust),
the mixture is too rich. With the engine stopped, lean the idle mixture about
1/8 of a turn.
❑ 5) Repeat steps # 1 and # 4 until the engine will transition from idle to full
throttle smoothly. Minor hesitation in the transition is normal.
MAINTENANCE
●
Avoid running the engine under dusty conditions. If you are in a dusty
environment we suggest using an air filter over the carburetor.
●
At the end of every flying day, purge the engine of fuel by disconnecting
the fuel line and allowing the engine to run dry of fuel.
●
Use a high quality after-run oil in the engine after you have purged the
engine of fuel. Inject the oil into the engine through the carburetor and through
the glow plug hole. Rotate the crankshaft several times to distribute the oil
throughout the engine. This will prevent the engine from forming rust.
●
Wipe the outside of the engine dry using a soft cloth.
●
Use a fuel filter between the fuel tank and the carburetor.
●
Periodically check to make sure all of the engine bolts are tight.
Information about returning your engine for warranty
service can be found on the separate parts list
packaged with these operating instructions.
Magnum XLS Series engines are distributed exclusively
by Global Hobby Distributors 18480 Bandilier Circle,
Fountain Valley, CA 92708
All contents copyright © 2003, Global Hobby
Distributors Version V1.0 February 2003