You may not be able to find a standard set of rings for a stock Honda piston unless you can find a Honda dealer that has been in business since at least the time your model was sold, in which case they may have some new old stock still sitting on their shelves. You can also check with some of the advertisers in Walneck's vintage cycle magazine that specialize in old Japanese motorcycle parts. If you don't mind using aftermarket parts, Wiseco makes a standard size piston & rings for your motorcycle. Part #339M05600 includes a standard size piston, matching piston rings, piston pin, and circlips. It does not include gaskets though. It retails for $187.39 and you have to purchase Wiseco parts through an authorized Wiseco dealer. Go to www.wiseco.com to look up an authorized dealer where you live. BTW - they also make several oversizes for when you need them.