gooday, calling from melbourne australia. i have a 1971 honda cb450 , but it is a k4 not a k1. i had one of the earlier ones when i was young, the 1969 model with the front drum brake and chrome tank panels. it seems that they must have been designated with different series to year codes depending on what country they went to. the 71 that i have is all original and complete,just needs restoring. regards woolfeman.