I have the Moped pictured in the far right, the yellow one thats not a top tank, but has the Laura m48. Now picture it as if it has been really neglected for 30 years, thats what mine looks like.
Since I have had problems with my other Batavus rebuilds, mainly lack of parts or information, I am going to swap out the m48 that is currently very seized with another motor. I was asking around and it seemed that there is one that would bolt right into place, but I couldn't remember the exact model number. I believe that it is either a Puch 103? or a Sachs..... something.
If you have any idea of a more popular engine that would have performance parts available and could bold on to the frame with little modification that would Rock.