Champ Spawn Restart


I would like to set restart time for champ spawns (delay time after champs death for next possibility to activate spawn), but restart props doesnt work (on ChampionSpawn).
RestartTime is 1/1/0001 12:00:00 AM and setting RestartDelay makes no changes. When i set AutoRestart time works, but it is possible to activate spawn with Valor. I want to make players wait to use valor... Any ideas?