well if you have a bad cylinder you can send it to a place to get it replated. if you just need a piston they are all over eBay. it will definitely be hard to find the bottom end for the bike. do some research and see what years interchange parts. also call a local bike shop and see if they can help. but if your looking for a while new top and bottom end for a bike that is 30 years old, it's not going to happen.
