Yes, you can rack a beer with high krausen. Racking a beer with high krausen means moving it from its original fermenter or barrel to a new fermenter. Yet, before you rack a beer with high krausen, be reminded of these facts as you watch your beer brew: High krausen is a sign (but not the only sign) that your beer is still undergoing fermentation. It will take 5 days to finish fermenting, 14 days for a complete fermenting process, and at least 21 days until the high krausen lowers itself, combining naturally with the beer. It is better to rack it when the krausen starts to subside. So, think twice (or thrice) before racking your beer with high krausen.