You prob had an air leak and blew one side and theres no compression. If the carbs were set and it ran fine. then all of a sudden its not rinning on one side..hmmmmm
auto paint store can match it real close. Also ive had my local shop make spray cans with whatever base coat I wanted. for quick parts matching instead of pulling the gun out and all the cleaning.
If you really know how to work on engines then this should be easy for you. get a coolhead with domes od your choice. carbs, timiing advance, etc. etc.. then its as simple as jetting it. there is air and fuel, its a simple 2 stroke ffs.