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,
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
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 it s no problem on performance.
◎Depending on the quality of the oil, sometimes there can be rust inside the crankcase. But it s no problem on performance as long
as there are no abnormal noise or backlash.
Battery for ignition system
4-Stroke Gasoline radial Engine Operating instructions
36.0mm x 3
Body: 3,057g / Muﬄers: 157g / Ignition system: 250g / Mount spacer: 64g (16gx4)
D24 x P10 standard
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
Engine mount set (Mount spacer)
Ignition system （w/ sensor）
Spark plug [NGK CM-6] （Attached to engine）
Muﬄer set (3 Flexible muﬄers & Bracket)
Carburetor adjustment bar
27.6mm x 3
Max on GND
Approx. 7 9kgf (Depend on prop）
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
2st Gas-engine 60 70cc class