Kelly ignition harness incorporate a negative-pitch spring design (the tip of the coil spring extends inward) allowing the coil spring tip to lie flat against the spark plug electrode, providing 360 degreee contact. Kelly ignition harnesses are FAA/PMA approved for Lycoming, Continental and Franklin engines.

Make/Model: Textron Lycoming (O-290-D, -D2, -D2B, -D2C IO-320-E2A HIO-360-B1A O-320-A2A, - A2B, -A2C, - A3A, - A3B, -A3C, -B3C, - D1A, - D2A, -D2B, -E2B O-340-A1A, -A2A IO-360-B1A, -B1B, -B1D, -B4A HO-360-A1A O-360-A1A, -A1D, -A2A, -A2D, -D2A, -D2B)