Does the horn/taillights etc still work?
If so, then probably your starter button. Check here for that repair:
http://www.valkyrieriders.com/shoptalk/VSGPages/starterbutton.htmIf the lights are out, check the battery cables and make sure they are tight and clean on the battery, and the ground where it goes to frame.
Also, there is a plug to the starter relay that can corrode/fail on the older Valks.
Lots of good reading here:
http://www.valkyrieriders.com/shoptalk/