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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

Crankshaft Threads M8 x 1.25 mm
Ignition Weight 4.0 oz (113 g)
Muffler Weight 2.9 oz (83 g)
Bore 1.26 in (32.0mm)
Power Type Gas
Plug Type 1/4-32 Spark Plug (SAIG20120)
Stroke 1.02 in (26.0mm)
Prop Range 15 x 8 to 16 x 8 2-blade; 14 x 9 to 15 x 7 3-blade
RPM Range 2000-9500
Cylinders Single
Total Weight 31.2 oz (0.89 kg)
Muffler Threads 13mm
Prop 65 Prop 65 Warning Icon  California Residents Prop 65 WARNINGS.
Benchmark Prop APC 16 x 6 @ 8800 rpm
Displacement 1.25 cu. in. (20.52 cc)
Oil Type & Content 20:1 gas-to-oil ratio; EVOX1001Q synthetic oil recommended
Cylinder Type AAC
Engine (Only) Weight 24.1 oz (0.69 kg)
Muffler Type Cast screw-on