Squizzy I have a Briggs that is locked up, I haven't looked at it, it was running well,no smoke or noises. I also think it has stopped charging and it needs that because it is not running a magneto, I converted it to coil ingition if I get a chance I will pull it apart tomorrow and see what has happened. I'm not sure the motor is worth spending the sort of money on it that it is going to need. I also have one in a Greenfield that I fixed up for a mate up the bush, it still goes well but is going through a fair bit of oil. It doesn't foul plugs but I would like to fix it up for him.
