GMS
2000 ENGINES
brought to you
by: MODEL ENGINE COMPANY OF AMERICA
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OWNER'S
MANUAL
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INSTALLATION |
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Use
sturdy engine mounts. Make sure that these mounts are
firmly integrated with the airframe, reinforcing the internal
surrounding structure as necessary to absorb vibration.
Wobbly engine mounts will allow the engine to vibrate
excessively and may damage the model and cause foaming
of the fuel tank. Also, the fuel tank is should be located
so that the center line of the tank is 10 to 15mm below
the center line of the needle-valve in order to prevent
"flooding" of the carburetor. |
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PROPELLERS
TO USE |
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We
recommend you always use a good quality hard wood propeller
of the size shown:
Engine Size >>
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25
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32
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40
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47
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61
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76
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1.20
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Prop Size
Range
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7 x 6
8 x 6
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8 x 6
9 x 6
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9 x 6
10 x 6
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10 x 7
11 x 6
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11 x 7
12 x 6
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11 x 8
12 x 7
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14 x 8
16 x 6
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We
urge that you do not use nylon propellers because their
flexible nature causes more vibration. Also, there is
greater possibility of propeller fracturing and blade
flying off. If a spinner is used, make sure that the
spinner notches are large enough to clear the propeller
blades and do not cut into and weaken the blade roots
when the propeller nut is tightened.
WARNING: Always
keep clear of the propeller when starting of adjusting
the engine. Never throw anything into a running engine
to stop it. Never alter, repair or share a propeller.
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ADJUSTING
THE CARBURETOR |
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The carburetor of the GMS engine has been factory set
for the approximate best result, but the settings may,
in some cases, vary slightly in accordance with fuel
and climatic conditions.
Three adjustable controls are provided on this carburetor:
1. High Speed Needle: For adjusting the mixture
strength when the throttle is fully open.
2. Idle Needle: For adjusting the mixture strength
at part-throttle and idling speeds, to obtain steady
idling and smooth acceleration to full speeds.
3. The Throttle Stop Screw: For establishing the
minimum idling speed.
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FUEL
TO USE |
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Model
airplane fuels are a mixture of methanol, oil, and various
additives to improve ignition, add power, and cut down
carbon deposits. It is important to use fuel with a
castor oil and/or synthetic lubricants, otherwise, your
engine life will be drastically reduced. Nitro is another
fuel ingredient that is often used. Its function is
to "advance the spark". To determine if you need any,
or more nitro, start your engine, open the throttle
wide open and set your high speed needle for maximum
power, then back it out slightly. Do all this with your
booster battery connected. Now remove your booster leads
- if your motor slows down, more nitro is indicated.
Conversely, if your motor speeds up, there is probably
too much nitro. We recommend high quality commercial
fuel with 10~15% of nitro.
WARNING: Model
airplane fuel is both flammable and extremely poisonous.
Run your engine only in a well ventilated area.
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GLOW
PLUGS |
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This
series of engines all use the long thread glow plug. We
recommend medium heat range plus. |
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HOW
TO START YOUR ENGINE |
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1.
Mount your engine securely on a mount that does
not put a strain on the mounting lug. The fuel
supply should be so positioned that the fuel level is
no more than 1/2" above or below the fuel nipple. The
fuel line should not be higher than the fuel level at
any point.
2. Close the throttle - adjust the idle stop screw,
to approximate the diameter of a pin when the throttle
is pulled close.
3. Screw the high speed needle in until it seats,
then back out approximately 1 and 1/2 turns.
4. Set the throttle at 1/4 open throttle position
and prime the engine by placing a finer over the air
intake and flipping the propeller counterclockwise a
few times. Now, connect the glow plug wire and crank
counterclockwise with a quick, snappy, and flipping
motion, or better, using an electric starter. It is
preferable to have the throttle only slightly open,
to avoid unnecessarily high revolutions when the engine
starts.
5. A good indication of whether you have your
idle needle set correctly is that if your engine choked
to stop when you apply the throttle from idle, it represents
the mixture is too rich and you can turn the screw clockwise
by 1/4 turn. On the other hand, if your engine speeds
up very quickly and then stops, it is too lean and you
should unscrew it by 1/4 turn.
WARNING: A
model airplane engine can get hot enough to cause a
serious burn. Do not touch the engine right after it
has been run.
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BREAK-IN |
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Your
GMS engine has a closely fit piston which requires only
15 to 30 minutes running before it will idle reliably.
No special fuel or propeller is necessary, but it is
recommended you use the fuel and propeller you intend
to use in your plane. Take care that the engine is not
run overlean (leaned in to the point that it loses power).
NOTE: Make sure that the engine is fully
"run-in" before operating it continuously at full power.
Otherwise, the life and performance of the engine may
be reduced.
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CARE
AND MAINTENANCE |
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The
following can help to ensure long life and maximum performance
from your engine:
1. Avoid running the engine under dusty conditions.
2. Use a fuel filter between fuel tank and carburetor.
3. Do not leave fuel in the fuel tank at the
end of a flying session.
4. Always keep the exterior of the engine clean.
5. If the engine is not to be used for a long
time, remove the glow plug and rinse the interior with
kerosene by rotating the crankshaft. Shake out the residue
and then inject.
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ATTENTION
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When
you use low nitro fuel, sometimes, if you start the engine
by hand, you will feel it's quite hard to flip over the
propeller; it's possible that the compression ratio is
too high. If so, please add one or two pieces of cylinder
gasket. On the contrary, if the engine can be started
very easy but RPM is not high enough, it's possible that
the compression ratio is too low. If so, please take out
one or two pieces of cylinder gasket. |
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©2005/1997
Model Engine Corporation of America, All rights reserved.
GMS
is a Trademark of Model Engine Corp. of America
No
part may be reproduced without written permission from
MECOA -- P.O. Box 98 -- Sierra Madre, CA 91025 U.S.A.
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