Betcha that flyer doesnt buy another 3W...
The engine WAS mounted on a thick plywood piece, the FIREWALL...
the engine was also mounted on 2 1/4 inch aluminum pieces reinforcing that FIREWALL...
The case could not possibly twist, and it didn't, it just came apart..The case is split horizontally, no twist evident..The old 3W heavier case would not have done this, it's way stronger....
In their quest for a lighter engine they have made the cases very thin, only .020 wall in some places, which would be passable with better quality casting, not the sand castings they use......It's possible that something was ingested through the carb and got between the piston and cylinder, forcing the case apart.....No way to tell without examination...
Looks like a no brainer for AI to replace the case, FREE, no matter what the cause....
I am quite familiar with 3W engines, having seen MANY over the last 10 or so years....