2003 Suzuki RM60 Dirt Bike Top End Engine Rebuild Kit [Bore Size (mm): 42.95 (Stock)] Bore Size (mm): 42.95 (Stock) Electrofusion Cylinder Namura Top End Repair Kits Include a Top End Gasket Set, Pistons, Rings, Wrist Pins, Circlips and Silver Coated SCM415 High Strength Chromoly Needle Bearings (Where Applicable) Precision Cut Klingersil Coated Steel Head Gaskets for Better Sealing and High-Temperature Resistance Compatibility: 2003 Suzuki RM60