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Specifications
SAITO FG-84R3
4-Stroke Gasoline radial Engine Operating instructions
Thanks for buying SAITO FG-84R3 4-stroke gas-engine
exclusively for model airplanes.
In order to avoid misuse, please be sure to read well this
instruction manual carefully. If there should be any
deficiency, inconvenience, etc. concerning the manufac-
ture, our company will repair them with responsibility.
Any failure or trouble caused by unnecessary disassem-
bly, modification, or other uses than those provided in
the instruction manual is not subject to the warranty,
however.
Moreover, 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.
Bore
36.0mm x 3
Body: 3,057g / Mufflers: 157g / Ignition system: 250g / Mount spacer: 64g (16gx4)
Stroke
27.6mm x 3
84.28cc
Disp.
Weight
Practical speed
Approx. 1,300-7,000rpm
D24” x P10” standard
Max on GND
Approx. 5,500-6,500rpm
2st Gas-engine 60~70cc class
Propeller
Static thrust
Approx. 7~9kgf (Depend on prop）
Applications
Fuel
Fuel consumption
Battery for ignition system
Standard accessories
Regular gasoline：Oil＝20:1 (Volume ratio)
Approx. 40cc/min (At full throttle 6,200rpm)
*Fuel flow varies depends upon prop load. More fuel flow with larger load and less fuel flow with smaller load.
Voltage: 6-9V higher than 1,000mA is recommended
85.6
70.2
100
221.7
51.5
15.4
36
Ø250
M10×1.25
Mount
Spacer
70
80
Outside dimensions
Fig.1
SAITO FG-84R3 is the gas-version of existing glow FA-450R3 with bore up. This new designed gas-engine is a figure of integra-
tion of many experiences on our radial engines and gas-engines. Additional designs concentrate on durability and high power
brought it powerful and beautiful radial sound.
Notification about treatment of 4-stroke model gas-engine
◎Since valve timing is designed to get high power and high speed, the overlap range is relatively wide. So sometimes fuel get flown
back from the carburetor. (It may spatter in the engine room.）
◎Since the oil for lubrication is mixed in the fuel, waste oil from the breather nipple is dirty. Depending on treatment of waste oil, it
can be spattered on the plane.
◎Since lubrication is through breather, sometimes the oil oozes from each joint or commissure however itʼs no problem on performance.
◎Depending on the quality of the oil, sometimes there can be rust inside the crankcase. But itʼs no problem on performance as long
as there are no abnormal noise or backlash.
Engine mount set (Mount spacer)
4pcs
Ignition system（w/ sensor）
1set
Spark plug [NGK CM-6]
（Attached to engine）
3pcs
Muffler set (3 Flexible mufflers & Bracket)
1set
Carburetor adjustment bar
1pc
Choke bar
1pc
Aluminum prop washer (w/steel washer)1set
Limit gauge (0.1t) for tappet adjustment 1pc
Spanner for tappet adjusting lock nut 1pc
Hexagonal wrench set
1set
Plug wrench
1pc
Anti-loosening nut
1pc
