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Decompression Valves
The valves are located in the center part
of each cylinder. Pressing this valve
(one or both) before starting will
decrease compression at starting. The
valve on the firewall side may be operat-
ed by a servo for easier operation.
Always use the valves when using an
electric starter. The valves are closed
automatically as the engine fires. For
restarting, press the decompression
valves again to open them.
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Entire Contents © Copyright 2001
Operator's Manual for BT-86
FEATURES
Manufactured by FUJI IMVAC INC.
YOKOHAMA, 235-0005 JAPAN
(except Japan)
Champaign, IL 61826 USA
www.fujiengines.com
SPECIFICATIONS
Displacement: 5.2cu. in. (86cc)
Horsepower:
Ignition Style: CDI Automatic
R.P.M.:
Fuel:
Weight:
The BT-86 engine features an electron-
ic ignition system. This system gradu-
ally delays the ignition timing according
to the number of ignition pulses,
increasing with the engine speed. The
fuel mixture is ignited at almost top
dead center when idling and the timing
is gradually increased as the revolu-
tions increase.
: Hobbico, INC.
7.5HP / 9000rpm
Ignition Timing
1100 – 9000rpm
40:1 Mixed Gasoline
5.8 lb. (2.6kg)
w/o Muffler
FJIZ8600 for FJIG0086 V1.1
™
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Summary of Contents for FujiFilm BT-86
- Page 1 The valves are located in the center part of each cylinder. Pressing this valve (one or both) before starting will The BT-86 engine features an electron- decrease compression at starting. The ic ignition system. This system gradu- valve on the firewall side may be operat- ally delays the ignition timing according ed by a servo for easier operation.
- Page 2 BEFORE OPERATION 1. Check to see that all screws and bolts are tight. Check carefully for any cracked, broken or missing parts. Tighten or replace before proceeding. 2. Do not operate engine in a closed room or where ventilation is not adequate. 3.
- Page 3 5. Rapidly flip the propeller until the engine starts. If the engine does not start, repeat the steps 1-4. 6. After starting, let the engine idle for two to three minutes. Open and close the throttle until the engine runs smoothly at idle and at full throttle. Acceleration should also be smooth.
- Page 4 Starting Without Using the Choke (Recommended after the engine is well broken-in.) Temperature: 60°F (15°C) or higher. 1. Set the throttle at idle. 2. Turn the ignition OFF. 3. Slowly turn the propeller by hand about 20 times (depending on the temperature).
- Page 5 INSPECTION & ADJUSTMENT Idle adjustment: 1. Always adjust idle with the engine shut off. Make sure the ignition is OFF. 2. Turn the idle adjust screw counter-clockwise to lower the idle RPM. Turn the screw clockwise to increase the idle RPM. Turn the screw about 45° each time.
- Page 6 If the ‘H’ needle is too rich, it may cause insufficient RPM at full throttle. This causes carbon buildup on the spark plug. If the ‘L’ needle is too lean, it may cause the following three symptoms: 1. The engine hesitates when accelerated rapidly. 2.
- Page 7 SAFETY WARNINGS Always use lightweight spinner for ease in balancing. Using a thick metal spinner could cause the propeller shaft to break. Do not use silicone fuel line because it will be attacked by the fuel. Use vinyl or neoprene rubber fuel line. Make sure the fuel line is well-secured to the metal tubes of the fuel tank so it won’t come off in flight.
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Page 8: Stopping The Engine
Because the carburetor is more complicated than those used in glow engines, keep the fuel clean by using a fuel filter. Use a filter intended to be used with gasoline engines. Filters intended for glow engines are too coarse, and will not screen out finer particles.
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