Cuyuna 2SI 215cc Aircraft Engine with Reduction Drive | Brand New 22 HP Powerplant

Cuyuna Reduction Drive Engine. The Cuyuna 2SI 215cc aircraft engine is a lightweight, efficient powerplant designed for

builders and operators who need reliable power in a compact package. Producing 22 horsepower, this brand-new engine has

never been mounted and never started, providing a rare opportunity to acquire a factory-fresh

unit suitable for a variety of light aviation projects.

Cuyuna Reduction Drive Engine

Includes Precision Reduction Drive

This engine comes equipped with a precision propeller reduction drive, designed to optimize propeller efficiency and performance.

Featuring a 2.5:1 ratio and a 75 mm prop flange bolt pattern, the system supports smooth power transfer while

helping maintain appropriate propeller speeds for light aircraft applications.

Cuyuna Reduction Drive Engine

Flexible Mounting Options

Engineers and builders will appreciate the versatility of this setup. The engine and reduction drive can be mounted upright or inverted, allowing flexibility during installation depending on airframe requirements and design preferences. This adaptability makes the 215cc Cuyuna 2SI engine well-suited for experimental aircraft, ultralight projects, and custom aviation builds where space and configuration matter.

Cuyuna Reduction Drive Engine

Lightweight, Brand-New Condition

Weighing approximately 38 pounds as pictured, this engine-reduction-drive combination provides an excellent power-to-weight balance. The unit is in brand-new condition, having only been removed from its packaging for inspection and photography, making it an attractive option for builders seeking unused components.

Engine & Component Details

• Manufacturer: Cuyuna / 2SI

• Displacement: 215cc

• Horsepower Output: 22 HP

• Reduction Drive: Included

• Reduction Ratio: 2.5:1

• Propeller Flange Pattern: 75 mm

• Mounting Orientation: Upright or inverted

• Weight: Approximately 38 lbs as configured

• Condition: Brand new, never mounted or started

• Exhaust System: Not included; compatible configurations available depending on application

Ideal for Experimental and Light Aviation Projects

This engine is well suited for:

• Experimental aircraft builds

• Ultralight and light-sport projects

• Replacement engines for compatible airframes

• Aviation hobbyists seeking compact, efficient power solutions

It delivers lightweight design, flexible installation options, and dependable 22-horsepower output — an excellent brand-new powerplant choice for builders and aviation enthusiasts looking for modern performance in a compact engine platform.