Given the time needed to get the engine running properly I have decided an engine swap is the go. Especially since I have a 3hp Briggs from my father in laws old edger (after it was replaced).
It was for the kids go kart but I bought the mower for my father in law so it seems only right to return his engine. Except now it has an alroh mower under it instead of an alroh edger.
I did have to modify the frame to accept the Briggs because it is wider and I did not enough clearance for the starter. This is how some of the later Alrohs are anyway. Having trouble loading pics so will add them later