Saito FG-21 4- Cycle Gasoline

Availability: In stock

Saito FG21 is a 4-stroke gasoline engine exclusively for model airplanes which is designed with emphasis on high performance, durability and weight saving. This engine is modified based on existing FG- 20 gasoline engine, equipped with renewed ignition system. For the airplane on which FA- 125 is installed, FG-21 can be replaced easily with minimal change such as fuel tank and lines to gasoline-resistant ones. 

• The first 4-stroke 21cc gasoline engines gives modelers a better option for .60-.90 size projects
• Fueled by gasoline to save up to 90% in operating costs over similar nitro power systems
• Exclusive pump-style carburetor allows for easy starting and operation with less weight than comparable styles
• High quality, professional finish adds scale realism


Bore  Ø32.0mm Stroke 26.0mm Stroke volume 20.9cc
Weight (approx)  Main Body: 690g/ Muffler: 83g/ Ignition system: 113g/ Engine mount set: 156g
Practical speed  Approx. 2,000- 9,500rpm Applications  4- stroke 100⁓ 110 class
Propeller  15"x 8", 16"x 8" Static thrust  Approx. 3- 4kgf
Fuel  Regular gasoline: Oil= Oil (2- stroke oil) 20:1 (Volume ratio)
Fuel consumption  Approx. 15cc/min (At full throttle 8,800rpm)
*Fuel flow varies depends upon prop load. More fuel flow with larger load and less fuel flow with smaller load.
Battery for ignition system  Voltage: 6-8V higher than 1,000mA is recommend
Accessories Limit gauge (0.1t) for tappet adjustment
Spanner for tappet adjusting lock nut
Hexagonal wrench set
Ignition system (w/ sensor attached)
Spark plug [SAITO SP- 1] (Attached)
Plug wrench
Muffler set
Engine mount set

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Saito FG-21 4- Cycle Gasoline

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  • Saito FG-21 4- Cycle Gasoline
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Displacement:   20.9cc
Power Output:   2.1HP
RPM:   1,800-9,500rpm
Weight:   690g