Orange Krate
Active member
Mt friend you just have to know the right people that have a 40yo clutch that is tapered made for the McCullochs. It does have a keyway on crank to fit the tapered hub. My blue printed yamaha kt 100 kart motor has a tapered crank too. You just have to get some valve grinding compound to mate the two together so the clutch hub and crank fit like a glove and don't slip.
Does this help?
http://www.vintagekarts.com/noticehorstman2003.htm.htm