Barrel and Piston - Big Bore Kit - Derbi GPR 125 Racing (Radial Caliper) 2004

Technical Information: Material of cylinder: Aluminium Type of cooling: water-cooled Bore: 65 mm Stroke: 50.68 mm Displacement: 168.2 cc Compression ratio: 13:1 Piston pin diameter: 16 mm Number of transfer ports: 5 Shape of the piston crown arched Number of piston rings: 2 Thickness of the upper piston ring: 1 mm Thickness of the 2nd piston ring: 1 mm Type of piston ring: chrome Material of the membrane: Not included Outlet: oval Cylinder Head: Included Maximum power at the crank: 25.5 HP / 10,500 RPM