[jrd]

Does it start right back up, ie if you wait for 30-60 sec? If so, I'm thinking fuel delivery. Probably got a filter that's almost full up with crud, so it's passing just a trickle.

If you have to wait 20 minutes before it will restart, that sounds more like a temp problem, perhaps a condensor or coil going intermittent with heat. Except that you've already changed that stuff out. Besides it doesn't sound like it's running long enough to get good and hot.

So I lean toward a line or filter or something being clogged.

 

[jrd]

So it backfires, then blows mixture, or liquid fuel out the carb intake?

I wonder if you have a fuel pump/carb problem? I'm not an expert on kohlers, does the 241 have a fuel pump like my 301? If the carb isn't set up right, such that the pump is pushing fuel past the needle valve, that could causing flooding, and also lead to fuel dripping back out the carb once it stops running.

 

[jrd]

Well ok, if you're seeing fuel dripping or spraying back out the intake, that can't be right. Does it leak when just sitting, ie not running?

I guess at this point I'd be looking at opening up the carb and making sure the float and needle are correctly set up and working.

The original description sounded like maybe fuel starvation, but this sounds like there's too much, not too little.