Unleash the performance of your Yamaha YZ125 and be a winner by mounting the class leading Factory 2.R Cylinderhead produced by RR-Racing. The Factory 2.R Cylinderhead for the Yamaha YZ125 is a significantly performance improving necessity to win races. The factory 2.R Cylinderhead is machined from billet high grade Aluminium that is specifically selected by its properties for this application. It has excellent heat transfer capacity, high detonation resistance, extreme efficient waterflow, resulting in more engine power for your Yamaha YZ125 for longer. The inserts are exchangeable to suit the power delivery of the Yamaha YZ125 to your needs. Start winning races and get your Yamaha YZ125 Factory 2.R cylinderhead ordered at your local dealer.