Specifications: Model Name: AM6 Material Type: Aluminum Piston Diameter Options: 40.3mm, 47mm, 49mm Piston Pin Diameter: 12mm Compatibility: MBK TZR X-Power R X-Limit SM Trail 50cc AM6 2T Minarelli Performance Enhancement: High Performance Cylinder Head Features: |Pnumatic Piston|Oversize Piston...