User Manual

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Global Services 18480 Bandilier Circle Fountain Valley, CA 92708 Phone: [phone] Fax: [phone] Email: [e-mail]
propeller onto the crankshaft, up against the thrust washer. Slide the propeller
washer up against the propeller and thread the prop nut into place. Tighten
the prop nut firmly to secure the propeller in place. When tightening the
prop nut, use an adjustable wrench. Do not use pliers.
WARNING If you are installing a spinner onto your engine, the cone of
the spinner must not rub against the propeller. Allowing the spinner
cone to rub against the propeller could lead to propeller damage and
eventual propeller failure.
PROPELLER, GLOW PLUG & FUEL
The diameter and pitch of the propeller needed for the XLS .52A will vary
greatly depending on the application the engine is used in. The weight, drag
and the type of model and how you intend to fly it are all factors in determining
the correct size propeller to use. Experimentation will be necessary to find
the optimal size propeller for your particular application. Ideally you want a
propeller that the engine will turn in the 10,000 - 15,000 rpm range on the
ground, yet power the airplane sufficiently. Using a propeller that is too small
will cause the engine to run at too high an rpm Using a propeller that is too
large will cause the engine to run at too low an rpm and cause it to lug down
too much. In both instances this can lead to premature engine wear and
eventual failure.
PROPELLER SIZE RECOMMENDATIONS
Propeller Recommendation
Use for
Break-In
Glow Plug Recommendation
Glow plugs can make a big difference in the performance of your engine.
We recommend using a hot heat-range glow plug intended specifically for
two-cycle engines. Do not use a cold heat-range plug. This can lead to
erratic engine runs and eventual engine wear and failure.
Fuel Recommendation
Fuel can make a big difference in the way your engine performs. We
recommend using two types of fuel with the XLS .52A. For the break-in
period you must use a fuel containing no more than 10% nitro methane and
no less than 20% Castor Oil lubricant. Use of fuel containing more than the
recommended percentage of nitro methane or any synthetic lubricants will
cause the engine to run too hot and result in excessive wear and engine
failure in a very short period of time. Once the engine has been adequately
broken in (about 1/2 gallon of the recommended break-in fuel), a fuel
containing up to, but no more than, 15% nitro methane and no less than
16% Castor Oil and synthetic lubricant blended fuel can be used.
WARNING We do not recommend using fuels that contain only
synthetic lubricants. Synthetic lubricants have a much lower flash point
than Castor Oil lubricants. Flash point is the point at which the lubricant
begins to actually burn and lose its lubricating qualities. Using fuels
containing a blend of Castor Oil and synthetic lubricants results in an
engine that runs cooler and lasts longer. One lean run using a fuel
containing only synthetic lubricants can cause engine failure. Using
fuels with a Castor Oil and synthetic blend of lubricants greatly reduces
this chance.
HIGH & LOW SPEED NEEDLE VALVES
High Speed Needle Valve
The high speed needle valve is used to meter the air/fuel mixture at full
throttle. Turn the needle clockwise to lean the mixture or turn the needle
counterclockwise to richen the mixture. When you start the engine for the
very first time the needle valve should be turned in completely, then backed
out 2-1/2 turns. When you start the engine after that, leave the needle valve
in the same position it was in when you shut down the engine.
Low Speed Needle Valve
The low speed needle valve regulates the air/fuel mixture at idle and during
transition from idle to full throttle. Turn the idle mixture screw clockwise to
lean the mixture. Turn it counterclockwise to richen the mixture. The idle
mixture screw is preset from the factory, but minor adjustments may need to
be made. To reset the mixture screw to the factory setting open the
carburetor barrel completely. While holding the barrel open, turn the
mixture screw in until it stops. From this point, turn the mixture screw
out 3 turns. This is the factory setting.
STARTING PROCEDURE
The XLS .52A can be started using an electric starter or it can be started by
hand. For safety and ease of starting, especially when the engine is new,
we recommend using an electric starter. The following two procedures
should be done with the power to the glow plug off.
Starting Using an Electric Starter
When using an electric starter it is not necessary to prime the engine. The
starter turns the engine over fast enough that the engine draws fuel on its
own. Priming the engine prior to using an electric starter can cause the
engine to "hydro-lock" or flood. This is a result of too much fuel in the engine
before it actually fires. Turning the engine over with an electric starter
while the engine is flooded can cause extreme damage to the engine
and/or cause the propeller assembly to come loose. Turn the propeller
through the compression stroke one time by hand to check for a hydro-
locked state before applying the starter.
Starting by Hand
When starting the engine by hand always use a chicken stick or a heavy
leather glove. Never just use your bare hand or serious injury could result.
To make the engine easier to start by hand it should first be primed. This is
done by opening the carburetor completely and choking the engine by
putting your finger over the carburetor opening. With the carburetor choked,
"pull" the propeller through the compression stroke 2 - 3 times. This will
draw fuel into the engine. Remove your finger and pull the propeller through
the compression stroke once to check for a hydro-locked condition.
BREAK-IN PROCEDURE
IMPORTANT The XLS .52A is an ABC engine. The cylinder sleeve is
tapered at the top, causing severe resistance when the piston moves through
the top of the stroke. This is normal. When the engine heats up to operating
temperature, this resistance will decrease and the proper clearance will be
achieved. The break-in procedure will guide you through the steps
necessary to properly break in your new ABC engine. Please follow the
steps on the next page closely.
10 x 6
9 x 6
10 x 5-8
11 x 4-8
12 x 3-6