This is the Zenoah G231PUH 23 cc Gas Engine for Heli. Brand New in Box.

Zenoah aircraft engines are famous throughout the modeling world for their outstanding power and exceptional reliability. These same qualities can be found in their new G-231, 23cc heli engine as well. It boasts approximately 20% more horsepower than its predecessor, the G-23 Heli, and is simple to start and adjust. It shares the same overall mounting dimensions as the older version, as well, so upgrading is easy.

Features

• Single-cylinder 2-stroke gas engine
• Better power and performance with no increase in cylinder volume User-friendly and easy to start and adjust
• Easy conversion for existing helis
• 20% increase in horsepower
• Displacement: 22.5cc

Specs

• Type:2-stroke
• Displacement:1.37 cu in (22.50 cc)
• Bore:1.30 in (32.00 mm)
• Stroke:1.10 in (28.00 mm)
• Cylinders:Single - Chrome Plated
• Engine (Only) Weight:56 oz
• Crankshaft Threads:M8 x 1.25mm
• RPM Range:3,000 - 11,000
• Fuel:Gas/Oil Mix
• Mounting Dimensions:142 x 105 x 181mm
• Muffler Type:Can
• HP:2.2
• Cylinder Type:Ring
• Carb Type:WT644/WT643
• Crank Type:Ball Bearing