Material: aluminum and steel Fitment: TRX400EX 1999-2007 and XR400R 1996-2004 Performance: Meets or exceeds OEM standards Design: Cast aluminum cylinder with steel sleeve Parts included: Cylinder, piston, rings, wrist pin, circlips, and end gaskets Weight: 3012g for the complete kit The TRX400 engine kit is designed for riders seeking to restore or improve the performance of their TRX400EX or XR400R ATV bikes.The kit features an 89mm bore size, matching specifications for direct replacement.The cast aluminum cylinder with steel sleeve provides under conditions.Components such as the piston, rings, wrist pin, and circlips are included and built to maintain consistent.Engineered for straightforward installation, all parts are bolt-on ready, requiring no additional modifications.This ensures compatibility with TRX400EX models from 1999 to 2007 and XR400R models from 1996 to 2004.The complete kit weighs 3012g, making it manageable during assembly.The cylinder is bored and honed to match the piston, supporting a secure seal and engine performance.Each part is constructed to endure off-road use while maintaining functional integrity over time.