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The
K&B .45 DF is a high performance engine, designed especially
for ducted fan models.
It is an improved version of our previous, highly successful
engine, known throughout
the world for its power and proven reliability, and will provide
countless hours of sport or
competition performance if properly handled and maintained.
This engine also features a drum rotor induction system.
The drum rotor is made of steel,
then hardened and ground to a super smooth finish. It
runs in a bronze bushing,
which gives the unit exceptionally long life.
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SPECIFICATIONS
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Displacement
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.45
cu. in. (7.41cc) |
Bore |
.870
(22.1mm) |
Stroke |
.760
(19.3mm) |
R.P.M. |
2,000
- 25,000 |
Power
Output |
2.2
HP @ 25,000 |
Weight |
13.4
Oz. (380g) |
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WARNING
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PLEASE
READ ALL SAFETY
INSTRUCTIONS! Failure to read, understand and follow
these instructions could result in personal injury and/or
property damage to yourself or others.
Take
a few moments to familiarize yourself with the various parts
of the engine. DO NOT DISASSEMBLE YOUR ENGINE! Doing so will
void your warranty. No exceptions!
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ENGINE
OPERATING NOTES
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GLOW
PLUGS:
This engine is designed to use our long reach glow plug (K&B
Part No. 7311).
FUEL:
We recommend either K&B 500 (12-1/2% nitro) or K&B
1000+ (25% nitro) fuel. K&B 500 will give your engine
more economy, and longer life. K&B 1000+ will give
your engine more power, less economy, and less life.
A
pressurized fuel system must be used to boost the fuel to
the needle valve. Install a pressure fitting on the
tunes pipe, just behind the apex where the cones join.
The recommended tuned pipe is the Mac's product No. 1260 (8.5cc)
muffled pipe. Direct a length of fuel line from the
pressure fitting vent on the fuel tank. In turn, the
fuel pickup line goes to the needle valve.
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IMPORTANT
PRECAUTIONS
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- Never
place your hand in front of the fan for any reason while
the engine is running.
- Keep
rags, articles of loose clothing, or anything that might
be ingested, well clear of the duct intake.
- Always
start the engine at an idle throttle setting.
- Wear
eye and ear protection.
- If
your fan installation calls for 6-32 screws for mounting
the engine, drill out the mounting lug holes with a No.
28 drill bit. Cover the front bearing exhaust, and
carburetor openings, and drill the lugs from the bottom.
Be sure to blow or brush away all aluminum chips and dust.
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MAINTENANCE
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MAKE
PERIODIC CHECKS. After every flight, remove the glow plug
and check the oil condition. If it is broken or badly
distorted, replace it. The glow plug life will be longer
when you achieve a good needle valve setting.
After
every four flights, check tightness of the engine head and
mounting screw, as well as fan and spinner security.
After
every twelve flights, check the tuned pipe coupler, and tightness
of the clamps.
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OPERATING
INSTRUCTIONS
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If
you are unfamiliar with this line of carburetors or are a
new modeler, please do not attempt to start the engine until
you have read and understand the following instructions:
1.
NEEDLE VALVE SETUP
Locate
an area to install the remote needle valve assembly.
This assembly must be in the fuel line between the tank
and the carburetor. The line should not exceed five
(5) inches in total length.
2.
LINKAGE SETUP
Notice
the barrel will rotate 360 degrees. Using your radio
and trim functions, set the barrel movement for full open
and close. IMPORTANT:
THE BARREL MUST BE CLOSE IN A CLOCKWISE ROTATION.
The opening in the barrel spraybar faces the crankshaft.
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NEEDLE
VALVE ADJUSTMENTS
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Note
that there are two fuel metering adjustments:
1.
HIGH-SPEED NEEDLE VALVE
This
needle valve, located on the remote Needle Valve Assembly,
controls all the fuel that comes to the engine, whether
the engine is running at high, mid-range, or idle speeds.
It does not affect the low speed rich/lean setting.
The High Speed Needle Valve's main function, however, is
to meter the high speed fuel mixture.
2.
LOW SPEED and MID-RANGE MIXTURE ADJUSTMENT
The
rich/lean adjustment is controlled by the "slotted" screw
located on the side of the carburetor where the low speed
disk is housed. The rich/lean mixture control is set
at the factory and may require only a "fine" adjustment
for your application. WARNING:
DO NOT RUN THE ENGINE AT A "LEAN" SETTING.
To adjust the mixture, loosen the bottom screw (do not remove)
and adjust the top slotted screw. This screw only
turns 1/4 turn to either the right or left of center.
It does not turn all the way around. Turn the screw
clockwise to "lean" the engine and counter-clockwise to
"richen" the mixture. After adjusting the mixture,
remember to "lock" it into position by tightening the bottom
screw.
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NEEDLE
VALVE ADJUSTMENTS - GENERAL
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As a starting
point for the high-speed needle adjustment, completely close
the needle valve (clockwise), then open it (counter-clockwise)
three and a half turns. This setting is an average and may require
further adjustments. For higher altitudes (3,000 - 4,000 feet),
close needle valve approximately 1/2 turn. |
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PRESSURIZED
SYSTEM
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All series
94 carburetors must run with exhaust pressure from
the tuned pipe connected to the fuel tank. |
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©
Model Engine Corporation of America, All rights reserved.
K&B and the oval logo are Registered Trademarks of Model Engine
Corp. of America
Registered U.S. Patent Office
No
part may be reproduced without written permission from
MECOA/K&B -- P.O. Box 5 -- Sierra Madre, CA 91025 U.S.A.
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