Hi, my bike is a 1973 DKW 125 Hornet (motocross) model, yellow tank. I have had it for about 25 years and has finished the Vegas to Reno offroad race in 1998.I have set this one up to campaign the D-37 GP series on this year with two second places so far. I have stock gearing, elephant ear handguards, brake snake, and fitted a Mikuni on it. I must say the Mikuni makes it fun to ride again! The 3rd round is next Saturday at Glen Helen and will let you know how it goes there. Thanks for the interest! (by the way, what is that c/shaft seal size?) Mikey V.