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FG-60R3 Instruction Manual
32.0mm x 3
25.0mm x 3
Weight (Approx.)
Body: 1,800g / Mufflers: 90g / Ignition system: 195g
Practical speed
D21" x P10" D23" P8"
Fuel consumption
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]
Optional parts
・Aluminum spinner nut [G57T-30]・Tappet adjusting kit [30-161] ・Digital tachometer [G17-167]
1. Fuel
●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
Vent line
Set the center of the carb
slightly above the fuel level
fuel supply to carburetor
Gasoline-compatible tubing
Close as possible
2. Ignition
●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.
(4)Tachometer cord
Connect the digital tachometer (Option). Otherwise the connector is normally vacant.
3. Propeller
●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
low-speed running.
●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)
・Plug wrench
・Hexagonal wrench 1.5mm
・Muffler set
・Stand off mount 39.5mm
Vent line
tank stopper
Fuel Level
Fuel Tank
Filter with weight
To Outside of the plane
Plug Cap
1) Plug Cord
Main Unit
(2) Sensor cord
(3) Battery Cord
(4) Tachometer Cord
Voltage: 6-8.4V
Capacity : 1,000mA∼
Full open
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.
◇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 (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
too lean.
●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-
sion stroke.
   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
to warranty.
CCW to make
22-7, 3-chome, Tokagi, Ichikawa-shi, Chiba prefecture 272-0024, Japan Phone: 047-378-4156 FAX: 047-378-4155
Main needle
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.
Slow (Idle) Needle
(Adjust with ⊖ screw driver)
Throttle lever
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.
Correct Gap
Close to 0 with no limit
Limit gauge
Must not be inserted


Table of Contents

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   Summary of Contents for Saito FG-60R3

  • Page 1 ●All responsibilities for the use of the engine, and other obligations and responsibilities based on laws, regulations, etc. are borne by the ●Prop-recommendation : Mejzlik D22 xP10 . purchaser and the user, and SAITO SEISAKUSHO CO., LTD. is exempt from any responsibilities. ●Use 15:1 fuel:oil ratio for break-in.
  • Page 2 No. Item No. Item 01 Cylinder Rocker arm pin 06 Piston Valve (In & Ex) 3ea. 07 Piston pin 46-1,-2 08 Piston pin retainer Valve spring & Keeper & Retainer 6ea. 09 Piston ring 47-1,-2, 48 10 Master rod Cotter (Valve retainer) 11 Linked conrod Rocker arm cover Conrod linkpin &...

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