So, on my 140 with K241, I was trying to start it up after fixing the fuel system, and now, instead of getting nothing, I get smoke out the carb. It started as white smoke out the exhaust (which I expected, with the glazed cylinder) but after a few pops all the smoke quickly stopped coming out the exhaust and only comes out the carb now. I'm thinking some carbon came from the cylinder and maybe scratched the valve seat, so I've got a valve lapping kit coming. Think that is the problem?
Here's a video: