Bike in question is a 1980 Yamaha XS400 but the concept applies to that era side by side twin jap bike I guess.
Bobber & Copper. Low buck stock frames, remove anything that isnt needed to run the bike, no tail only rear fender, usually hard tail, forward controls, ape’s or drags. Full on chopper is usually including an extended fame and/or raked out front end and low stance. Expansion bumps and frost heaves will kick your ass on these style bikes. More or less its a poor mans big twin chopper.
Cafe. “knock off” racer boy bikes. Real racers used to bust the balls of they “wanna bees” that parked out side of the cafe and pubs in europe with their “race bikes”. The bikes are stripped down for weight reduction, performance look with a single hump rear seat & fender, fly screen faring, Rear suspension still working, stock frames, stock height, raised rear sets, thinner tank to hug and grab with your knees, low and narrow clip ons or 1 piece swept down bars. They still ride nice, handle fine, but agressive-ish rider position still puts a strain on the rider.
What do you dig? Post an example. I am picking up a stock XS and going one way or the other, to build/sell. At this point I personally am leaning towards a chopper; hard +3" tail, flush 130deg wrap rear fender, mini apes, forward controls, jocky shift, bass boat flake, gold leaf work, cool ass straight duals.