14 May RULE CHANGE FOR FLAT JR 1 and FLAT JR 2 littleeagle2016-03-08T23:08:36+00:00 News Per IKF Rules, new restrictor sizes will be mandatory for Jr. 1 and Jr. 2 FLAT KARTS… Jr. 1- .440 Blue Horstman Jr. 2- .530 Red Horstman Share this post FacebookTwitterLinkedInGoogle +Email