The story on this saw was that it was a typical JMS job. I found some pics.
He did some type of rotten popup. As usual, port work looked great, but he did shoddy machine work.
Ex flange was cracked and poorly redone as an M6-again it’s typical. Jason told me on one then more occasion that there was no need to tap a stripped M5 bolt out, just ram an M6 bolt in. This is why his stuff cracked. The ex flange has an M6 timesert in it because the hole was too big for a proper M5, I V’d the crack and welded it, left the extra meat on it.
The base was off by .004. This was corrected. There is a pic of true center vs what he used on the top of the jug. The band was recut on the lathe and squish came in at a true 22.
This saw ran so well, and the numbers wound up being a no choice option, that my newer 361 adopted the same recipe. I had to cut the muffler open to take out the inner restrictor that he left clanking around in it. The muffler was tig brazed back together.
Here are some pics I found.