Wiseco 826M04150 Suzuki JR50 Kawasaki KDX50 1634CD Piston FPS: First Person Shooter (2023). Wiseco 826M04150 Suzuki JR50 Kawasaki KDX50 1634CD Piston Wisecos legacy is rooted in 2 stroke piston manufacturing and performance, dating over 80 years ago back to 1941. Today, Wiseco 2 stroke pistons are the result of decades of experience, incorporating the latest in 2 stroke piston manufacturing and design to deliver the performance Wiseco built its name on. Engineered, forged, and machined in the USA in Mentor, OH Designed and built for each specific 2 stroke powersports engine Improved tensile strength of forged material optimizes strength and service life Dedicated forgings and additional lightening operations allow for optimized strength to weight ratio Includes high quality piston ring(s), wrist pin(s), and circlips