Hello just wanted to ask someone who knows more about this thing than i do ? I was told 42 bmw r12 with sidecar but cylinder head looks a little different. It has holes on cyl head but photos of other bikes donĀ“t have head bolt holes. ?can someone please shed some light on what i have here or if engine has been changed out im clueless as i have only owned sport bikes any input is helpful thanks ps how do i post pics