Guys, that's not a half breed(see link). It(the half breed) has a ZAE50 rod. If I am seeing it right its an 80. That's the rod Fred says in his crank vid he has never seen. Its grouped with the GT5 engine with the FM80 rod. It is 38mm but has a much longer rod(if he is right and they are the same). This crank runs the high pin piston. Look for fine cyl stud threads. http://motorbicycling.com/showpost.p...1&postcount=41
Heres some are some comparison pics of the Dax, ZAE50, and the FM80/GT5. I have been wrestling with this crank thing down in my scratch build thread. pic1 ZAE50/FM80 pic2 Dax/FM80 pic3 ZAE50/Dax the dax appears a 38mm instead of the advertised 40.