HONDA CRF 250 R (2004-2009) Forged pistons of the extra class 81.00 mm

This reduces friction and leads to even higher heat resistance. The internal bracing minimizes piston deformation in order to achieve maximum ring support and deliver more force. The additional oil can lubricate the piston pin through the inner window.These windows together with the CP standard `` Double - Pin - Oiler '' promote a longer life and more usable horsepower. The inner bracing additionally strengthens the part in the most critical area of the bolt hole. It maximizes endurance by reducing friction in the piston pin bore. The cylinder must be bored out and recoated. For years of construction 2004 to 2008.