need some help here.
have two ST .45's made in Italy.
However they look very different and trying to find out other than appearances what the difference is in these engines.
the pic shows one of them.The top of the head is dished in towards the glow plug. The carb slides into a sleeve in the body of the engine.Inside the carb it looks like there is a sleeve to rstrict air flow.
The other engine has a square head and the carb bolts to the engine.
If I can dig up a pic of it I will edit the post with it