Piston Kit STD with part numbers 705-850026T1 and 39-831255A6 is designed for use in 30HP to 60HP 2-cylinder and 3-cylinder boat engines.This piston kit features a standard configuration with a piston diameter of 76mm and a height of 74.5mm.The wrist pin measures 19.6mm, proper connection to the connecting rod.The kit includes piston, rings, wrist pin, and clips, providing all necessary components for a complete piston assembly replacement.Engineered for marine applications, this piston kit supports efficient combustion and heat dissipation.It is compatible with various engine models manufactured between 1994 and 2007.The design allows for straightforward installation, making it suitable for both professional mechanics and DIY users performing engine rebuilds.This piston kit serves as a direct replacement for parts numbered 850026T1 and 850026A1.