Overview Reviews Product Description Wiseco 804M06640 66.40MM PISTON Product Videos Custom Field Category Engine Components>Piston Sets - Powersports MPN 804M06640 Product Reviews Write a Review Write a Review × Wiseco Wiseco 99-23 Yamaha YZ250 ProLite 2614CD Piston Kit - 804M06640 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *