Here is the replacement piston ring ATHENA 182cc Ø63mm mounted on YAMAHA, HONDA, HUSQVARNA,... These rings are mounted on the A or B side of your piston. Ideal if you consume oil for example. If you have a strong loss of compressions we advise you to change the piston for the dimension above. Don't forget to change your gaskets for a tight reassembly and thus an increased reliability