Welcome Taiak,
To the best of my knowledge, there were no 'California Emissions' bikes made, they were all the same for the US market.
The only emissions controls on the bike, should be the 'pulse air' system, that's the metal and rubber tubing that goes from the air box, to the exhaust port on the cylinder head .
This plumbing, and the related vacuum operated valves in the air box can be removed, and the leftover holes, can be plugged easily .
The parts availability for the R65 is still pretty good, and yours being a mono-shock model, has a lot more parts compatible with the larger mono-shock bikes of that year .