I have a k6 myself that I totally went thru. I saw your post in the WTB section, pm me if you would like as I have my stock 76 rack just hanging out
The carbs on these bikes you practically want to do finger tight, and as some find out the hard way on the main jet some threads can show, it doesn't matter because it was made like that
Careful with your pilot jets, a PO stripped my #3. Very fine threads and don't need much torque at all