Per the "Clans and Family Encyclopedia" the Motto for Clan MacKenzie
"Luceo non uro ( I shine, not burn)"
"Cuidich 'n righ" is the wording on the Chief's Standard.
per "The Clans and Tartans of Scotland" by Robert Bain
War Cry is "Tulach Ard"
Translation of Tulach Ard is "high knoll."
Fairbairn's Book of Crests lists several armorigious McKenzie's crests and mottos. The description on page 365 lists: "M'Kenzie, Scotland, a stag's head embossed. "Cuidich in rhi"
"Cuidich in rhi"
"Cuidich 'n righ"
Both mean "Assist the King"
Lauren M. Boyd, FSA Scot
Scottish Information Societyhttp://www.scottishinfo.org