Cheap And Discounts Boat Engine 6E0-11631-00-98 STD Piston Set & 6G1-11610-00 Ring for Yamaha 4HP 5HP, 50mm STD Wholesale. Buy Directly From Merchant SouthMarine Outboard Motor Parts store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.