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The Saito FG-21 is a 1.26 cu in (20.52cc) single-cylinder four-stroke gasoline engine for RC aircraft, sold with a muffler and magnetic ignition. It fits 21cc of displacement into the smaller FG-20 crankcase, which gives it a strong power-to-weight ratio for its class, and it runs on gasoline mixed with synthetic oil at 16:1 to 20:1. The best new price is $599.00 at eBay as of November 6, 2026, and two stores list it new.
In stockSold by Modellbahn Ott Hobbies, Inc.
Availability unknownSold by jeffharris75 (100% positive, 52 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
Also available at
Lowest price we've seen: $646.05 on Nov 6 at Walmart. Tracked across 2 stores since Nov 6.
Rated 4.5 out of 5 from 15 ratings. Owners value the four-stroke sound and the low running cost of gasoline, and most report reliable running once the carb is dialed in.
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 Overview 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.
