Pro Circuit’s High-Compression Piston Kit for the 2019 Kawasaki KX450 is manufactured by JE Pistons to meet exact fitting specifications. Pro Circuit pistons are forged from high-quality aerospace aluminum alloy using advanced CNC-machined technologies. The result is a significant gain in low-end torque and high-RPM performance. Pro Circuit High-Compression Piston Kits are designed for superior performance in either stock or modified engines and is a must-have engine component for serious racers.
Link: Pro Circuit