behind the left side passenger footpeg
Remove the seat and the top compartment. It's under the air filter.
yamalube or Castro syntech weight is up to you yama lube prefer because it is used for higher rpm motors
Check under the plate between the speedo. and the tac.Themain fuse is located above the voltage regulator/rectifier (fusible link) . The cooling fan is an in line fuse.
I just broke my right hand mirror trying to get it off because I assumed it was the normal right threaded. Turns out it is left threaded. What a joke. Snapped it off for no reason whatsoever.
lowest possible point on the engine
The fuse panel on the Virago is under the instrument light cluster that surrounds the ignition switch where the neutral indicator light is located.
20/50 w Yama oil is what i use
I/C Regulator built inside alternator.
if you replace the alternator will you also be replacing the voltage regulator
Well u gotta do regular service and tunings as well as overhauls if u feel loss on power use a thicker oil on your next oil change with an add of S.T.P another good way is to remove the adjusting limiter
Most vehicle manufacturers now put the regulator inside the alternator.
Inside the alternator