FujiFilm BT-86 Operator's Manual

SPECIFICATIONS

Displacement: 5.2cu. in. (86cc)
Horsepower: 7.5HP / 9000rpm
Ignition Style: CDI Automatic

Ignition Timing

R.P.M.: 1100 – 9000rpm
Fuel: 40:1 Mixed Gasoline
Weight: 5.8 lb.(2.6kg)

w/o Muffler

FEATURES

Manufactured by FUJI IMVAC INC.

YOKOHAMA, 235-0005 JAPAN

Worldwide Distributor (except Japan): Hobbico, INC.

Champaign, IL 61826 USA

www.fujiengines.com

Entire Contents © Copyright 2001 FJIZ8600 for FJIG0086 V1.1

The BT-86 engine features an electron­ic ignition system. This system gradu­ally 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 revolu­tions increase.

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 fire wall side ma y be operat­ed 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.

Operator's Manual for BT-86

™

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 v entilation is not adequate .

3. Check to see that there are no foreign objects in the path of the propeller.
Secure any loose articles of clothing so they cannot be drawn into
the propeller.

4. Prepare only the amount of gasoline needed. Aged gasoline could dam­age the engine and cause it to overheat.

5. Mix gasoline with 2 cycle oil only in the ratio of 40 parts gasoline to 1 part oil
(break-in ratio is 25 to 1.) Using fuel with an incorrect fuel/oil ratio or with oil
not intended for 2 cycle engines could cause damage and allow the engine
to overheat. Use an appropriate fuel filter to eliminate foreign matter.

6. Always allow engine to cool prior to refueling.

Break-in Operation

Operate engine for about one hour with a fuel mixture that contains
a 25:1 fuel/oil ratio. Do not break in by opening the high-speed nee­dle on the carburetor. Carbon will accumulate in the spark plug,
which will make ignition difficult. (There is no problem if break-in is
done by flying the engine.)

STARTING PROCEDURES

Manual Starting:

1. Make sure the ignition is OFF. Close the choke plate on the carburetor
and open the throttle slightly from the idle position.

2. Rotate the propeller slowly about 10 to 20 times (more in Winter) until fuel
begins to move to the carburetor. (Swing the prop one-half turn to move the
piston from top dead center to bottom dead center, and then bac k to top dead
center repeatedly. Opposite rotation can also prime the carburetor.)

3. Turn the ignition ON and flip the propeller several times briskly.

4. Turn the choke lever to the OPEN position after you hear an initial firing
and the engine stops. You can squirt gasoline directly into the carburetor
if the engine does not fire.

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.

Safety Warnings:

For manual starting, make sure the propeller is properly adjusted on
the propeller shaft to allow you to rotate the flywheel past the ignition
coil at the highest possible speed during starting. Flip the prop rap­idly from the point where you can first feel the compression.

Warning: Gasoline is volatile and flammable. Gasoline should be
stored in an approved container, away from heat or open flames. Do
not smoke near gasoline. Use caution when transporting gasoline
and take precautions when fueling your engine.

Starting With Optional Spring Starter (FJIG1086)

1. With the ignition OFF, close the choke plate on the carburetor and open
the throttle slightly from the idle position.

2. Rotate the propeller slowly about 10 to 20 times (more in Winter) until fuel
begins to move to the carburetor. (Swing the prop one-half turn to move the
piston from top dead center to bottom dead center, and then bac k to top dead
center repeatedly . Opposite rotation can also prime the carburetor b ut will not
be possible when using the spring starter.)

3. Turn the ignition ON. Hold the propeller, turn it clockwise 360° (one rota­tion) and let it go.Turn the choke lev er to the OPEN position after you hear
an initial firing and the engine stops. You can squirt gasoline directly into
the carburetor if the engine does not fire.Repeat steps 1,2, & 3 above, as
necessary.

Starting With Optional Electric Starter (Onboard type or External type)

1. With the ignition OFF, close the choke plate on the carburetor and open
the throttle slightly from the idle position.

2. Turn the propeller with the starter for a few seconds until fuel begins to
move to the carburetor.

3. Turn the ignition ON. Turn the propeller with the starter.

4. Turn the choke lever to the OPEN position after you hear an initial firing and
the engine stops. You can squirt gasoline directly into the carburetor if the
engine does not fire.Again, turn the propeller with the electric starter.