How does reserve fuel tank work on 83 Honda magna? Is valve always open or do i have to turn it?

How does reserve fuel tank work on 83 Honda magna? Is valve always open or do i have to turn it?

There's no "reserve tank" on any bike, only differing height positions for the fuel to be drawn from the tank. If you'll look on your petcock, I think you'll find it's either on, off and prime. Is there a low fuel light? By the way, you may want to bookmark this

http://www.cantonmg.com/stewsplace/ShopManualVF750C.html

Every Honda I've ever owned the tap's marked!
usually down for main, horizontal for prime and pointing up for reserve.
Makes sense when you stop to think,
you don't want to screw around under a tank while moving feeling for the tap!

Ron on the 83 Honda Magna V45 there's a separate reserve tank it is located on left side of machine.