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4.1 out of 5 Customer Rating

FG-21 (1.26) 4-Stroke Gas Engine: BN

Item No. SAIEG21
Brand Logo
4.1 out of 5 Customer Rating

FG-21 (1.26) 4-Stroke Gas Engine: BN

Item No. SAIEG21
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Product Details

Key Features

  • Gasoline engine lowers operating costs as much as 90%
  • Latest carb technology makes for easier tuning and operating
  • 21cc displacement in a 17cc case
  • New valve seat design
  • New, smaller magnetic ignition system fits into tighter cowl installations
  • Horizon Hobby recommends the use of Red Line or Power Model synthetic oil only, at a mix ratio of 16:1 – 20:1


There are a lot of advantages to going with gas, like cleaner operation and cheaper fuel. But Saito™ 4-stroke gas engines give modelers more, namely some of the most impressive power-to-weight ratios in their class. The FG-21 engine is no exception. Based on the groundbreaking Saito FG-20 engine, it packs 21cc of power into a 17cc case. Accompanying the extra displacement is the latest carb technology, updated exhaust valve seats and, of course, the sweet 4-stroke sound Saito engines are famous for.

Product Specifications


Benchmark Prop APC 16 x 6 @ 8800 rpm
Bore 1.26 in (32.0mm)
Crankshaft Threads M8 x 1.25 mm
Cylinders Single
Cylinder Type AAC
Displacement 1.25 cu. in. (20.52 cc)
Engine (Only) Weight 24.1 oz (0.69 kg)
Power Type Gas
Ignition Weight 4.0 oz (113 g)
Muffler Threads 13mm
Muffler Type Cast screw-on
Muffler Weight 2.9 oz (83 g)
Oil Type & Content 20:1 gas-to-oil ratio; EVOX1001Q synthetic oil recommended
Plug Type 1/4-32 Spark Plug (SAIG20120)
Prop Range 15 x 8 to 16 x 8 2-blade; 14 x 9 to 15 x 7 3-blade
RPM Range 2000-9500
Stroke 1.02 in (26.0mm)
Total Weight 31.2 oz (0.89 kg)