1995? That’s pretty young actually.
If you REALLY have to do something with it…… then how about an electric conversion?
Build your own ELECTRIC Honda Cub. Conversion KIT from Shanghai Customs.
TBH…… I would just leave it as it is. Once you take into consideration the carbon-footprint of actually producing a new product then it is FAR FAR more environmentally friendly to continue using the old product until it explodes (Even if it is producing emissions as all internal combustion engines do.)
Honda Cubs sip fuel, spares are cheap and plentiful and Cubs are used worldwide for all manner of applications.
Use it until it explodes. That would be my answer. (Just dont expect it to explode anytime soon.) They are pretty unburstable.