50mm stud spacing, 8.5mm main stud holes, 12mm wrist pin, 43mm stroke, 47mm bore. Boyesen ports, Gila size reeds with fiberglass petals and PHBG intake.
$250 shipped, can throw in a Honda PA-50 I case and a stock motobecane crank for $300 shipped, if you want to make up a not-o-becane engine as was our intent. Contact me Via E-mail at Motodrachen@gmail.com, or on telegram @motodrachen