SW6 International stalls, advice needed

I would remove that inline fuel filter if it's not for a gravity fed system. Most are used with a fuel pump. You need to make sure it's a fuel problem when it quits. It could be a weak coil causing the problem when it gets warm.

To rule out the coil pull one the plug wires asap
when the engine quits and see if you still have fire to the plugs. Hal
PS: You may need to open the main jet adjusting screw near the bottom of the carburetor. Like the one on this old B&S carburetor.

If you get only a dribble of gas look for a restriction. Possible causes:
- piece of junk plugging the fuel outlet at the bottom of the tank. (It's usually rust, but I've pulled leaves, pieces of gas cap gasket, bits of rag, etc from atop the fuel inlet at the bottom of tractor tanks...) - a kinked or dented fuel line
- if the steel fuel line has been replaced with hose, a partially collapsed hose
- a plugged or collapsed screen behind the fuel inlet fitting on the carb.
- float level set too high, or float binding in the bowl.
- the inline fuel filter you installed may be too restrictive (is designed for a system with a fuel pump, not a gravity flow system as on your tractor.)

Also be on the lookout for an accumulation of rust etc. in the bottom of the bowl obstructing the high speed jet. Even if you cleaned the carburetor, fresh junk can get into it from a rusty fuel line, etc.