yea but that doesn't explain the pull sticking with plug in and smooth out.It might be. Getting turned upside down may not have helped the needle valve in the carburetor. You might need a new needle and seat but you still need to keep the fuel shutoff valve closed any time the generator isn't being used as a precaution.
Yea then no hydrolock. checking the valves todayBy taking the plug out a couple of times and pulling it over and checking oil level should take the hyrolock out of the equation.