Hi everyone. Basically as the title says, it starts fine and runs well but if you turn off when warmed up it'll never start again until cold. I pulled the plug, spun it over incase flooded, it has a spark. I can smell fuel so what could the problem be?

choke or auto choke setting?

It's an auto choke. Even when turning it over on starter motor it won't go

Is the fuel old.
I only ask as generators can sometimes be used occasionally.

I believe unleaded goes off.

The fuel is Ok, it starts up first time fine. Just when hot it gets into a paddy