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Saito FG-84R3 Operating Instructions Manual

4-stroke gasoline radial engine.
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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.
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.
Specifications
Bore
Weight
Practical speed
Propeller
Fuel
Fuel consumption
Battery for ignition system
Standard accessories
Outside dimensions
Fig.1
SAITO FG-84R3
4-Stroke Gasoline radial Engine Operating instructions
36.0mm x 3
Body: 3,057g / Mufflers: 157g / Ignition system: 250g / Mount spacer: 64g (16gx4)
Approx. 1,300-7,000rpm
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
Choke bar
Stroke
27.6mm x 3
Max on GND
Approx. 5,500-6,500rpm
Static thrust
Approx. 7 9kgf (Depend on prop)
Applications
4pcs
Aluminum prop washer (w/steel washer)1set
1set
Limit gauge (0.1t) for tappet adjustment 1pc
3pcs
Spanner for tappet adjusting lock nut  1pc 
1set
Hexagonal wrench set
1pc
Plug wrench 
1pc
Anti-loosening nut
M10×1.25
100
221.7
-1-
Disp.
84.28cc
2st Gas-engine 60 70cc class
85.6
15.4
36
Mount
Spacer
70.2
51.5
1set
1pc
1pc
70

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Table of Contents

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   Summary of Contents for Saito FG-84R3

  • Page 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.
  • Page 2 2. Fuel The fuel is mixture of commercial regular gasoline and reliable oil for 2-stroke. (Unleaded high-octane gasoline is not necessarily required for SAITO engine.) [Example of oil] ・ POWER LUBE (KLOTZ ORIGINAL TECHNIPLATE) View from the rear Fig.2...
  • Page 3 *The unit includes a plastic clip to hold the connectors and spiral tube to protect each wire. The ignition system is designed to match SAITO 4-stroke gas-engines with automatic advancing system. However this ignition system is designed to be an anti-noise product, please isolate it completely from the receiver, servo, and battery to avoid a radio-interference trouble.
  • Page 4 8. Engine mounting, muffler attachment, and breather waste disposal FG-84R3 can be installed with mount spacers. As the carb comes out from back of the firewall, Firewall hollow out the firewall as possible as minimum referring to the cutting sheet included.
  • Page 5 (3) Refill the tank and run the engine with the main needle to achieve peak and less speed (richer) alternately about 5 times. And then maintain the peak condition long gradually. When it gets stable, then operate the throttle stick to vary slow speed to high speed several times to check the response.
  • Page 6 (f) Finally do the same adjustment for #2 cylinder. * In the case of the engines for vehicle, small gap is given to tappets to absorb valve elongation. However for SAITO engines, gap becomes larger during operations due to thermal expansion of the cylinder (made of aluminum). Therefore set the gap indefinitely close to zero when the engine is cold.
  • Page 7 SAITO FG-84R3 Parts List(1/2) No. Item Cylinder Piston 14-3 37-2 32-5 32-9 14-4 Piston pin Piston pin retainer Piston ring Master rod Link rod 42-2 Link pin & Retainer & Washer 2ea. 47-2 12-1,-2,-3 40-2 Cylinder screw set 1set 14-1,-2,-3,-4...
  • Page 8 SAITO FG-84R3 Parts List(2/2) No. Item Valve retainer (Cotter) Rocker arm cover Intake pipe Flexible exhaust pipe 78-1,-2,-3 Carburetor complete 82-1 1set 82-1-1,-1-2,-1-3,-1-4,-1-5,-1-6 32-3 32-3 -1-7,-1-8,-1-9,88,93 31-1 31-2 Throttle lever Engine mount set 1set 95-1,-2,-3,-4 Muffler bracket set 2set 99-1,-5,-7...

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