lifan and others are licensed or some #$%* to copy the old honda design?the z50 here was semi auto three speed 50cc,ct70 (dax)was 72cc three speed semi auto,the st70 had a one up and two down transmission for some reason?the amigo was a 50cc push rod thing with 2 speed semi auto,the motor is in our honda "postie"(postal service)bikes in 125cc and semi auto,the chinese ones go to 140/150cc.