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Global Services 18480 Bandilier Circle Fountain Valley, CA 92708 Phone: (714) 963-0329 Fax: (714) 964-6236 Email: [email protected]
Your XLS series engine 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.
WARNING ABOUT ENGINE HYDRO-LOCKING
If the engine becomes hydro-locked, do not force the propeller through the
compression stroke. The excess fuel should be expelled from the engine.
●
Completely close the high speed needle valve until it bottoms out, then
remove the glow plug from the cylinder head.
●
With a rag over the top of the engine, turn the crankshaft several times,
using your electric starter or flipping the propeller by hand. The excess
fuel will be expelled out of the engine and into the rag.
●
Check to make sure that the glow plug has not been fouled, then reinstall it
and reset the high speed needle valve.
PROPELLER, GLOW PLUG AND FUEL
Propeller Recommendation
The diameter and pitch of the propeller needed for the XLS .15A engine 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 12,000 - 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,
cause it to lug down too much and make tuning difficult. In both instances
this can lead to premature engine wear and eventual failure.
PROPELLER SIZE RECOMMENDATIONS
Use for
Break-In
8 x 4
7 x 4, 5
7 x 6, 7
8 x 3, 4
8 x 5, 6
Glow Plug Recommendation
Glow plugs can make a big difference in the performance of your engine.
We recommend using a long-reach, hot heat-range glow plug intended
specifically for two-stroke engines. Do not use a cold heat-range plug.
This can lead to erratic engine runs, difficult tuning 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 .15A engine. For the break-in period you
should use a fuel containing no more than 15% nitro methane and no less
than 18% Castor/synthetic blend lubricant. Use of fuel containing more than
the recommended percentage of nitro methane or only 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), we still
suggest using 15% nitromethane fuel, although a fuel containing up to, but
no more than, 30% nitro methane and no less than 18% Castor/synthetic
blend lubricant can be used. Remember though, when using higher
nitro-content fuels, the engine will run hotter and its useful life will be shortened.
You must also be careful when leaning out the engine.
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 AND 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 valve clockwise to lean the mixture or turn the needle
valve 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 is preset from the factory for initial starting
and break-in.
Do not adjust it until after the engine is broken in.
The
low speed needle valve regulates the air/fuel mixture at idle and during
transition from idle to full throttle. Turn the needle valve clockwise to lean
the mixture or turn the needle valve counterclockwise to richen the mixture.
The low speed needle valve is preset from the factory, but minor adjustments
may need to be made after the engine is broken in.
To reset the low speed
needle valve to the factory setting, follow these procedures:
●
Open the carburetor barrel completely.
●
While holding the carburetor barrel open, turn the low speed needle
valve IN (clockwise) GENTLY until it stops. From this point, while still
holding the carburetor barrel open, turn the low speed needle valve
OUT (counter-clockwise) 2 full turns. This is the factory setting.
WARNING
It is possible to adjust the low speed needle valve so lean
that the engine will not draw fuel. The low speed needle valve should
not need to be adjusted more than one full turn in either direction from
the factory setting. If the engine does not idle or transition, reset the low
speed needle valve to the factory setting.
STARTING PROCEDURE
Starting Using an Electric Starter
When using an electric starter it is not necessary to choke and 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 barrel completely and covering the tip
of the muffler with your finger. Fuel can then be drawn into the engine by
"pulling" the propeller through the compression stroke 2 - 3 times. This will
draw fuel into the engine. After fuel begins to enter the carburetor, remove
your finger from the muffler and pull the propeller through the compression
stroke once to check for a hydro-locked condition.
