20GX 20cc Gas Engine w/Pumped Carburetor by Evolution

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This is the Evolution 20GX 20cc Gas Engine with Pumped Carburetor. Since the release of the Evolution 10GX small-block engine, countless modelers have discovered the benefits of gas power in aircraft formerly dominated by .40-size glow engines. But what about the pilots who enjoy even larger airplanes in the .91- to 1.20-size range?

Bring the fuel efficiency and easy operation of a gas engine to your sport flying experience with the Evolution 20GX engine. Its pumped carburetor makes fuel flow uniform and consistent regardless of fuel tank location and makes needle valve adjustment easier. Itís been designed with a standard beam mount and dimensions that allow it to fit anywhere you might use a .91- to 1.20-size glow engine. The 20GX will breathe new life into models designed for glow power. Itís also remarkably lightweight, even with the ignition system and battery. But what sets the 20GX apart from its nitro-fueled counterparts is its phenomenal fuel efficiency. It takes only 30% of the gas/petrol to run the 20GX the same amount of time it would to run a comparably sized glow engine. Thatís an amazing efficiency level that results in a cost per flight difference of 90% on average to you.

All of the Evolution brand gas engines are designed from the start to provide excellent performance at a fraction of your previous operating costs. Each engine is painstakingly designed to insure a hassle free experience without giving away anything in expected performance or durability.


  • Pumped-carburetor for greater reliability and ease of installation
  • Reliable fuel system-easy to tune and efficient
  • Outstanding power and performance for demanding RC pilots
  • Lightweight construction based on the Evolutionģ 1.20NX glow engine
  • Standard .91 size beam mount allows for traditional mounting
  • Gasoline fuel delivers low operational cost and simplicity
  • Outstanding power and performance for demanding RC pilots
  • 2S Li-Po battery compatible ignition without a regulator provides long run times
  • Lightweight electronic ignition provides easy starts and superior reliability
  • Single prop nut attachment convenience
  • In-cowl muffler included
  • Supplied with fuel tubing and filters that handle gasoline and the high operating temperatures of a gasoline engine

Type: 2-stroke Airplane
Displacement: 1.20 cu in (20.0cc)
Bore: 1.20 in (30.5mm)
Stroke: 1.10 in (27.9mm)
Cylinders: Single
Total Weight: 33.9 oz (961 g)
Engine (Only) Weight: 25.2 oz (714 g)
Muffler Weight: 5.2 oz (148 g)
Crankshaft Threads: 5/16 - 24
Benchmark Prop: APC 16x6
Prop Range: 15x6 to 17x8
RPM Range: 1,800-10,000
Fuel: 87-91 octane gasoline (petrol)
Muffler Type: Inverted Wraparound
Cylinder Type: Ringed/Steel Liner
Carb Type: Evolution Pumped
Crank Type: Threaded

This product was added to our catalog on November 7, 2014.