Cheap And Discounts 50-4001Z GY6 50cc O-Ring of Cylinder Head Cover For both the EGR and Non-EGR type 4 stroke GY6 50 139QMB Engine 107*99*2.5mm Wholesale. Buy Directly From Merchant Mortch Motor Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.