There are multiple waterfalls with the name Kyrfossen in a river called Kyrelvi. This Kyrfossen is a long stretched waterfall just outside Vik in the region of Hordaland along road 13. The waterfall has a total height of 460 meters and ends in the Sognefjord.
From Vik camping you will have a good view on the waterfall and a little bit north of Vik on road Fv92 you will see the Kyrfossen in his full glory.
The Kyrfossen isn’t an official named waterfall, although there is a significant flow in the river Kyrelvi.