piaggio scooter engine hi-per 2
bore 40mm (70ccm 47,6-48mm, big bore engines 50mm)
stroke 39,3 (it is possible also 44mm and 45mm)
standard rod 80mm (various tuning crankshafts has 80/85/90mm)
piston pin 12mm (racing engines possible 13mm)
other I don´t know now...but after race season I can measure :-)