Not and have it look cool like does now. Certainly you can change the look and retrofit another tank.
For the 535 model, according to (http://www.artsturm.ee/virago_535/specs.html) that would be 3.7 gallons (13.5L = 3.56632271 US gallons).
yes they are not cheap, but just type in virago 535 centre stand and they will come up
45
Fuel capacity is 3.6 US gal with .7 US gal reserve
low beam yellow wire connect to fuse box under the seat run under gas tank stay on key on.
Approximately 92 MPH on the 1990 model.
jardine rumblers
I'm not sure about the Virago 700, but on the 535 it's under the right side-cover, under the seat, clinging to the side of the under-seat gas tank. If in doubt, follow the thick positive wire from your battery, it goes straight into the relay.
possible change diaphragms in both carbs.
The color code the primary color red is 4794-96944222.
The Yamaha Virago 535 has a circular window on the front left side of the crankcase, immediately behind the shift linkage. The bike needs to be held upright (second person) and then the use of a flashlight helps see the level in the window. Level should be approximately center of the window.
the starter clutchs are junk. but other than that...a pretty good bike