Overview Reviews Product Description ProX 01.2436.B High Compression Piston Kit fits Yamaha YFZ450 '04-09 13.0 ProX 01.2436.B Product Videos Custom Field Product Reviews Write a Review Write a Review × ProX ProX 01.2436.B High Compression Piston Kit fits Yamaha YFZ450 '04-09 13.0 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *