I’ve done this before! Here is a Honda CBR600. Californian specification. It was purple and white and had the most confounding and complicated set of pipework around the exhaust manifold that was something to do with emission laws in the states. Most of the bits are CBR600 but if you look closely you will find a fair amount of Suzuki RG250 hanging around in there.
And this faded little chappy was (and probably still is) a Yamaha RD250. The air cooled one. This arrived in a dozen boxes with a padlock around the wheel. No key for the padlock so it took a bit of persuading to remove it. The only bike I have ever owned with a chrome plated frame.