Overview Reviews Product Description EXHAUST VALVE 21mm125cc YX WY-B9 Product Videos YCF PART # YCF PART # 206F039 Product Reviews Write a Review Write a Review × YCF EXHAUST VALVE - 21mm Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *