Saito Engines 100 FA-AAC Four Stroke Glow Engine w/Muffler: QQ

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Saito Engines 100 FA-AAC Four Stroke Glow Engine w/Muffler: QQ
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Super-Sized Power for Your .60-Size Plane! The FA-91 is one of the most popular selling engines in Saito's extensive line of four-strokes. The .91 fits perfectly into most airplanes designed for .60-size two-strokes offering the ability to swing larger diameter props with more thrust than the two-stroke. Additionally many pilots simply prefer the powerful sound of a four-stroke! Now Saito™ is offering a four stroke glow powered engine that offers even more power than the .91 but that's similar in size and weight.

Saito's new FA-100 will turn an APC 14 x 8 prop 300 to 700 rpm more than either the Saito .91 or O.S. .91. At only 19.2 ounces (less muffler), it weighs nearly 2 ounces less than other manufacturers comparable engines! The Saito FA-100 is not just a punched out .91. It features a newly tooled case that shares the mounting dimensions of the O.S. 91. This allows it to be used with the many after-market engine mounts already available to fit this engine.

In testing, Saito 100 idled and transitioned beautifully from the first start due to the included new Hangar 9™ Super Plug (HAN3011) that now comes with all Saito engines. This plug greatly improves idle and transition in all four-stroke engines. In flight, the FA-100 was one smooth operator. Transition and idle were clean and crisp with instantaneous response. No dead sticks occurred in the first six test flights, despite purposefully long high-altitude idles, followed by rapid full-throttle transitions.

If you're looking for a powerful lightweight four-stroke to power your latest .60 through .90-size project, you don't have to settle on a 91. Check out Saito's new FA-100.


  • Same mounting dimensions as O.S. 91 Surpass
  • 1.00-size in a .91-size case


  • Type: 4-stroke
  • Displacement: 1.10 cu in (17.10 cc)
  • Bore: 1.14 in (29.0 mm)
  • Stroke: 1.02 in (26.0 mm)
  • Cylinders: Single - Chrome Plated
  • Total Weight: 20.9 oz
  • Engine (Only) Weight: 19.5 oz
  • Muffler Weight: 1.4 oz
  • Crankshaft Threads: 8x1.25mm
  • Benchmark Prop: APC 14 x 8
  • Prop Range: 13x9 - 14x10
  • RPM Range: 2,000 - 11,000
  • Fuel: 10%-30% Synthetic
  • Mounting Dimensions: 115x60x128 mm
  • Muffler Type: Cast
  • Cylinder Type: AAC
  • Carb Type: Barrel, 2 Needle Valve
  • Crank Type: Ball Bearing

This product was added to our catalog on May 21, 2021

Allen Barbee
Saturday, Sep 9 2023 (3 months ago)
Saito Engines 100 FA-AAC Four Stroke Glow Engine w/Muffler: QQ
I've had this in a Hangar 9 .60 size Spitfire MK II for 10 years now. It runs flawlessly on YS/SAITO 20/20 fuel and a 14x8 APC prop. I do aerobatics with it! You can fly inverted, soar to 400 ft fast, knife-edge, etc. The motor allows me to do a lot with my Spitfire.

NOTE: I did recently have to rebuild it because I moved and let it sit for too long. I had to take it apart and clean it, including valve removal. If you're going to let it sit on the shelf, put after-run oil, or equivalent, into it every few months and rotate the crankshaft to keep it in good shape.
bryan glass
Verified Owner
Tuesday, Aug 15 2023 (3 months ago)
Saito Engines 100 FA-AAC Four Stroke Glow Engine w/Muffler: QQ
5 flights and it is busted!
Horizon service center phone number is DISCONNECTED!
The muffler manifold cracked right through the threads to the engine.
Horizon is the warranty provider and there is no way to confirm what address to contact them with. The manual says to send the whole engine which would cost the same as the part cost.
They do not reply to the contact form.
Your gamble.