FG-100TS Instruction Manual
φ43.6mm x 2
33.6mm x 2
Main Body: 4,040 g / Mufflers: 180g / Ignition: 160g
• Limit gauge (0.1t) for tappet adjustment (1 pc)
• Spark plug[CM-6](Attached to the engine) (2 pcs)
• Ignition system (w/sensor) (1 set)
• Stand off mount (1 set)
• Filter with weight [G36-154]
• Tappet adjusting kit [120S-161]
• Durable tube for Gasoline (1m) [G36-155]
• Digital tachometer [G17-167]
• The fuel is mixture of regular gasoline or high-octane gasoline and high-quality 2-stroke
• [Example of oil recommendation]
1. Klotz KL-200 Original Techniplate
2. Deluxe Materials PowerModel 2T-S etc.
• Be sure to use the mixture "gasoline : oil =15~20 : 1" by volume ratio. (Ex. 1000ml of gaso-
line should be mixed with more than 50ml of oil ).
Fuel ller line
Set the center of the carb
slightly above the fuel level
Fuel supply to carburetor
Stand oﬀ mount
Close as possible
• Ignition arrangement—Place the main unit as far from other electrical devices as possible.
1. Plug cord (meshed high tension cord)
2 cords compatible for left/right cylinder. Insert the cap deeply into the plug to make sure it will not come off.
2. Sensor cord
Connect with the cord from the sensor attached to the engine.
3. Battery cord (black/red cord)
Use a fully charged battery that has adequate spec. (6-8.4V, more than 1000mA is recommended.).
Between the battery and main unit, make sure to set a heavy duty switch whose capacity is higher than 3A.
4. Tachometer cord
Connect the digital tachometer (Option). Otherwise the connector is normally vacant.
• Recommended propeller is Mejzlik 26 x 12.
• Use a well-balanced one. Never use the propeller that has been scratched or damaged even if slightly.
• Open a hole exactly in propeller hub (boss) in advance as shown in the right figure using drilling tool and
• Pass the propeller through the shaft and tighten the six bolts inserting the propeller washer in the order of
diagonal. The appropriate length of the bolts may be different depending on the thickness of the propeller hub
(boss). Depending on the propeller and spinner backplate you use, use M5 x 0.8 bolts with length that protrude
15~18mm. (Screw length of standard accessory is 55mm).
• As the propeller is compressed slightly, tighten the 6 bolts every hour of operation.
Max on ground
Battery for ignition system
Voltages: 6–8V, greater than 1,000mA
• Spanner for tappet adjusting lock nut (1 pc)
• Carburetor adjustment bar (1 pc)
• Muffler set (1 set)
• Choke bar (1 pc)
• Muffler bracket (1 set)
• Plug wrench (1 pc)
• Hexagonal wrench (1 pc)
• During the break-in process, use 15:1 mixed fuel to ensure the best lubrication for initial
• Any damage caused by the fuel used, in which the oil ratio is lower than 20:1 will not be
covered by warranty.
• Do not use gasoline containing ethanol. It may cause not only power loss but also corrosion
inside the engine.
Filter with weight
To Outside of the plane
(1) Plug cord
(2) Sensor cord
(4) Tachometer cord
6 x 5.2
4. Method of choke (No need when you use starter.)
• Choking is the means by which fuel is fed to the engine when you start it by hand flipping. Thus it is unnecessary when using
starter. Starting with a electric starter is recommended for safety.
• During choking, be sure to turn off the ignition switch.
• As shown in the fig, pass the choke bar (with M3.5 thread on its tip) through the hole in the cowling. Then turn the bar to insert
Acro-2st 70cc class
into the M3.5 internal thread at the center of the throttle lever.
Scale 2-st 70cc-100cc class
• Fully close the throttle and pull the choke bar and fix it with a clip or clamp as shown in the fig so that it may not go back to
the previous position.
• Grasp the prop by hand and turn it several times in the direction of normal operation (CCW) until the carburetor generates
hissing-like sound. After hearing this sound for about 5 times, quickly flip the prop approximately 10 times.
• Remove the choke bar. Then power on the ignition system and flip the prop quickly to start the engine. If the engine doesn't
start, repeat the choking procedure.
5. Break-in MOST IMPORTANT!!
• Before starting the engine, inject a suitable amount ( approx. 20~30cc ) of engine oil into the lubrication nipple on the crank-
case using a syringe or pump while turning the propeller by hand. After that, plug this nipple. As excess is discharged from the
breather nipple, attach a tube to the breather nipple.
• Prop-recommendation : Mejzlik-26 x 12.
• Use 15:1 fuel:oil ratio for break-in.
• Never make the fuel mixture lean during Break-in. It could cause seizure even during idling or low speed running.
• Before starting the engine, open the main needle Approx. 3 turns open (CCW) from fully closed.
• Start the engine (using a starter is recommended for safety).
• Run for about 30 seconds at low speed to warm up.
• Open the throttle gradually up to over half open. In the meantime turn the main needle CCW. Continue to turn the main needle
CCW until the RPM declines, keeping the throttle opened over half.
• If opening main needle doesn't drop RPM, then open the slow needle too.
• Run in this very rich condition for 1 liter of fuel.
• Now "initial" break-in is done.
6. Adjustment of carburetor after initial break-in
• Needle reference position (Set after initial break-in)
• Start the engine after adjusting the needle to the following reference value.
• Main needle: Approx. 2.5~3 turns CCW from fully closed.
• Slow needle: Approx. 4 turns CCW from fully closed (Then throttle should be fully
• Actually, the best position of the needles vary depending on the prop, temperature,
humidity and so on. Please adjust as necessary after observing the engine performance
• Peak adjustment
• After starting the engine, warm up for approx. 30 seconds at low speed.
• Achieve the peak at full throttle.
Turn the main needle CW gradually to the position where the RPM is greatest
Switch (more than 3A)
(the peak). Continuing to turn the needle CW past the peak could lead to seizure
so turn it slowly and carefully. If the RPM suddenly decreases after passing the
peak, instantly turn the main needle
• Once achieving peak RPM, return the throttle to low speed. Make a note of the position
Voltage : 6-8.4V
of main needle at the peak at that time. (How many turns you did CW based on the
Capacity : 1,000mA~
• Slow needle adjustment
• After achieving peak RPM, next is slow needle adjustment. Open the throttle from low
RPM to full throttle quickly.
• Turn the slow needle CCW slightly if the engine hesitates for a moment or stalls before
the engine reaches max RPM because the mixture is too lean.
7. Tappet adjustment
The valve clearance should be checked and adjusted after break-in and every time after two hours while the engine is cold. Before adjusting tappet gaps, tighten up the screws around cylinders etc.
1. Remove the spark plug and rocker arm covers of a cylinder. Then turn the prop CCW by hand to place the piston at TDC of compression stroke.
2. Loosen the lock nut and adjust the gap by hexagonal wrench until you get the correct gap for both of intake & exhaust.
3. Once the gap is set, tighten the lock nut and attach the plug and covers. Then do the same adjustment for the other cylinder.
4. Turn the prop by hand to check if the compression is enough. If the gap is less than 0, the valve is always opened slightly and lose compression. Then adjust again.
Choke bar for insert
(Move to the left)
by a clip
• Turn the slow needle CW slightly
if the engine is slow to reach
peak RPM (full throttle set)
because the mixture is too rich.
• Adjust the slow needle as above
until the RPM follows the throttle
movement smoothly. The impor-
tant point is to adjust the slow
needle AFTER the main needle
has been adjusted to its peak.
• Now break-in at ground level is
done. Adjust tappets by the method described later.
• Pre-flight / Flight adjustment
• When the slow needle adjustment is done, check the response by revving up from low
speed to full throttle quickly several times.
• Open the throttle fully and turn the main needle CCW approx. 60~90 degrees from
the peak position. This is to make the fuel mixture richer in the air where the RPM get
higher than on the ground.
• After all adjustments are made, fly your aircraft and fine tune the engine according to
the situation. Basically tuning should be done with the main needle. Readjustment of
the slow needle is rarely needed if the first adjustment of the slow needle has been
Close to "0"
with no limit
Must not be