FG-60R3 Instruction Manual
32.0mm x 3
25.0mm x 3
Body: 1,800g / Muﬄers: 90g / Ignition system: 195g
D21" x P10" D23" P8"
1/4-32 SP-1 or SP-2 spark plug
Battery for ignition system
・Limit gauge (0.1t) for tappet adjustment
・Spanner for tappet adjusting lock nut
・Spark plug [SP-2](Attached to the engine)
・Ignition system（w/ sensor）
・Filter with weight [G36-154] ・Rubber tube for gasoline(1m) [G36-155]
・Aluminum spinner nut [G57T-30]・Tappet adjusting kit [30-161] ・Digital tachometer [G17-167]
●The fuel is mixture of regular gasoline or high-octane gasoline and high-quality 2-stroke engine oil.
●[Example of oil recommendation]
・ Klotz KL-200 Original Techniplate
・ Deluxe Materials PowerModel 2T-S etc.
●Be sure to use the mixture gasoline : oil =15 20 : 1 by volume ratio. (Ex. 1000ml of gasoline should be mixed with more than 50ml of oil ).
●During the break-in process, use 15:1 mixed fuel to ensure the best lubrication for initial running.
●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.
Fuel ﬁller line
Set the center of the carb
slightly above the fuel level
fuel supply to carburetor
Close as possible
●Ignition arrangement- Place the main unit as far from other electrical
devices as possible.
(1) Plug cord(meshed high tension cord)
Insert the plug cap of (1) Plug cord deeply into the plug of #1 cylinder
to make sure it will not come oﬀ. The other caps and plugs should be
installed by the same way. (Refer to cylinder # on the reverse side)
(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.
Connect the digital tachometer (Option). Otherwise the connector is normally vacant.
●The Standard prop is Mejzlik D22 xP10 which brings approx. 6,400rpm. Larger size or greater pitch can cause engine broken due to
●Use a well-balanced one. Never use the propeller that has been scratched or damaged even if slightly.
●As the propeller is compressed slightly, tighten the 6 bolts every hour of operation.
4. Break-in MOST IMPORTANT!!
●Prop-recommendation : Mejzlik D22 xP10 .
●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
●Before starting the engine, open the main needle Approx. 2 turns 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 throttle gradually up to full. In the meantime turn the main needle CCW. Continue to turn the
main needle CCW until just before engine stops keeping the throttle opened fully.
●Run in this very rich condition for 1 liter of fuel.
●Now initial break-in is done.
2st Gas-engine 50cc class
Max on GND
Approx.30cc/min (At full throtle 6,500rpm) *Fuel ﬂow varies depends upon prop
load. More fuel ﬂow with larger load and less fuel ﬂow with smaller load.
Voltage:6-12V, greater than 1,000mA (2-3S Li-Po or 5S NiMH)
・Hexagonal wrench 1.5mm
・Stand oﬀ mount 39.5mm
Filter with weight
To Outside of the plane
1) Plug Cord
(2) Sensor cord
(3) Battery Cord
(4) Tachometer Cord
Capacity : 1,000mA∼
ver. Aug, 2018
5. 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. 1+1/6 1+1/2 turns CCW from fully closed
●Slow needle ： Approx. 6 7 turns CCW from fully closed (Then throttle valve
should be fully closed)
●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 during ﬂight.
●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 (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
CCW to again increase the RPM. Otherwise it could damage the engine seriously.
●Once achieving peak RPM, return the throttle to low speed. Make a note of the position of main needle at the peak at that time. ( How many
turns you did CW based on the reference value. )
◇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
●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 important 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 done successfully.
6. 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 the screws around cylinders etc.
1. Remove the spark plug and
rocker arm covers of #1
cylinder. Then turn the prop
CCW by hand to place the
piston at TDC of compres-
Top Dead Center
Switch Capacity :3A∼
Loosen the lock nut
（The state both valves are closed)
●As it uses oil-mixed fuel, the plane may sometimes get dirty from the exhaust.
●Use a reliable and well-balanced prop. Otherwise it may cause an abnormal vibration and could result in a serious accident.
●During operation, all engine screws can loosen due to metal heat expansion. Check and tighten occasionally.
●When the exhaust valve gets dull by carbon or sludge especially in cold atmosphere, remove the rocker cover and apply some anti-rust
spray to the exhaust valve to help the valve to move smoothly.
●Pay attention to the surroundings so as not to disturb others by noise and exhaust.
●Always keep spectators stand behind the engine when operating the engine.
●As exhaust smoke is harmful, be careful not to breathe in or otherwise expose yourself to its harmful eﬀects.
●Pay attention not to touch the rotating propeller when starting engine, and move to rear side of the aircraft once the engine is started.
●All responsibilities for the use of the engine, and other obligations and responsibilities based on laws, regulations, etc. are borne by the
purchaser and the user, and SAITO SEISAKUSHO CO., LTD. is exempt from any responsibilities.
●If there is any deﬁciency from the factory concerning manufacture, please consult with the shop or distributor you bought from. Our
company will be responsible for repair. However, any failure or trouble caused by unnecessary disassembly, modiﬁcation, or other uses
than those provided in the instruction manual is not subject to warranty.
●Ignition system is subject to the warranty only for initial failure. Once the system has been activated successfully, it will no longer be subject
CCW to make
22-7, 3-chome, Tokagi, Ichikawa-shi, Chiba prefecture 272-0024, Japan Phone: 047-378-4156 FAX: 047-378-4155
2. Loosen the lock nut and
3. Once the gap is set, tighten
adjust the gap by hexago-
the lock nut and attach the
nal wrench until you get
plug and covers. Do the same
the correct gap (below pic)
adjustment for the #3-#2
for both of intake &
cylinders in order.
Adjust the gap turning
Tighten the lock nut
to ﬁx the set screw
the set screw
All speciﬁcations and models are subject to change without notice.
SAITO SEISAKUSHO, CO., LTD.
Slow (Idle) Needle
(Adjust with ⊖ screw driver)
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 sightly and lose
compression. Then adjust again.
Close to 0 with no limit
Must not be inserted