Motorcycle Shift Drum Gearshift Forks Material: Steel Package Includes: 1 x Shift Drum Fit For: - 55mm Bore engines (Air Cooled, Oil cooling) - 52. 4mm Bore engines - Start in neutral - Gear: 1-0-2-3-4 Compatible With: Horizontal Kick Starter Engines for dirt bikes and pit bikes Compatibility Disclaimer: This is an aftermarket replacement part. Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.