Saito FG-84R3 Four-Stroke Radial Petrol Engine


SKU: SAT84R3FG Categories: ,

Availability: In stock

Saito FG-84R3/FG-90R3 Ring Muffler Exhuast

Pilot-RC Electric Starter motor for Saito FG-90R3 / FG-84R3

Product Features

  • Petrol version of the 450 3-cylinder radial
  • Larger displacement than the glow version
  • 2S Li-Po battery compatible ignition without a regulator provides easy starts and reliable performance
  • Engine heat sink for better cooling and performance through an aerobatic routine
  • 4-stroke sound Saito™ engines are famous for
  • Complete with electronic ignition, mufflers and engine standoffs


The Saito™ FG-84R3 engine is the gas/petrol version of the existing FA-450R3 glow engine. This engine is designed specifically for large models and performance airframes. Above and beyond the advantages of a 4-stroke gas engine, this is the engine for those who like to run clean and efficient engines. Accompanied by the Saito power and precision craftsmanship, the distinguished look and sweet sound, this is the engine many of you have been waiting for. This engine delivers a larger displacement than the older 450 3-cylinder radial engine, and provides easy starts and reliable performance due to the 2S LiPo-compatible electronic ignition. The designed Walbro carburetor features a rotating barrel specially made for 4-stroke engines, ensuring reliable fuel feed and outstanding performance at any attitude. Engine heat sink provides better cooling and performance through an aerobatic routine. Complete with mufflers, engine mount, and electronic ignition.

As an expert in reliable 4-stroke engines, Saito engineers spent years developing the best-built 4-stroke gas engine. The power-to-weight ratio of a Saito engine creates a one-of-a-kind flying experience. For serious modelers, the long awaited arrival of the 450R3 gas version is here with the same quality, sound and precision craftsmanship Saito is known for.


Bore: ø36.0mm x 3
Stroke: 27.6mm x 3
troke Volume: 84.28cc
Weight: Body – 3,057g | Muffler – 157g | Ignition System – 250g | Stand-Off Mount – 64g (All Approx)
Pratical Speed: Approx 1,300 ~ 7,00rpm (Recommended highest speed on ground: 5,500 ~ 6,500rpm
Recommended Prop: D24″ x P10″ (Standard)
Fuel: Petrol/Gasoline = 20:1 (Volume Ratio)
Fuel flow: Approx. 40cc/min (at full throttle, approx 6,200 rpm) Fuel flow varies depends upon propeller load. More fuel flow with larger load and less fuel flow with smaller (In actual flight, fuel flow somewhat increases).
Static thrust: 7 ~ 9 kgf (Dependent on the Prop size)
Battery for Ignition: Voltage – 6-9V | Capacity – recommended over 1,000mA


Here is a video of Dan’s(klms)  unfinshed topflite fw 190 with a completely Standard saito 84r3 fitted.

This engine is on its 34th flight and in this particular model this was it’s 9th flight.
Model weight came out at 35lb.
The engine runs a Maximum of 120degrees C on cylinder one and makes 6900rpm static on a wide xoar 24×10

Hopefully this video will show this engine does NOT require any modifications to run well, the ONLY addition we made was a keleo creations collector ring.

Any further infomation please feel free to call the shop and speak to Dan.

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