I have recently acquired a 1962 ATCO lawnmower serial 6216. It was left in a shed (thankfully with a roof on) for about 15 years and apparently was not running when it was put away so I thought for a first project this would be great. I have checked the engine over and it seems to have decent compression and when I checked the carb, it too seemed fine. I put some petrol into the tank and turned on the fuel tap to let it flow through to the carb but when I began to pull the engine, petrol started to flow out of the back of the air filter on the carb. I took the filter off and found that there was petrol leaking out of the hole ( I tried to attach a photo but I cant ) just below the air intake. At first I thought it was a blockage but after I removed the domed nut, I found that the fuel jet inside was completely clear. It had been messed with though because the slot for the screwdriver was damaged like someone had tried to force it in or something. I cannot find out if the previous owner did anything because they passed away a few years ago. From my limited experience of fixing newer lawn mowers, I found that carburetors shoot petrol through into the engine but this one seems different. There is a tiny hole in the carb but it does not screw up to the level of the intake, I cannot see what is stopping it but I do not want to push it.
If anyone could tell me what could be wrong with the carb it would be greatly appreciated. If anyone knows how these Villiers s10/2 carbs work would also be handy. There is an exploded diagram on the internet but I do not want to post the link in case it is private etc.
Many thanks, Chris