And the air leaks in these positions is what could be causing the engine to flood??

I haven't had a chance to get another look at it since the weekend.

When I was pulling it over I checked the spark plug and it was wet with petrol and could see petrol in the cylinder then when I replaced the plug that would be when it would go then. So I suspect flooding is the issue. Especially having read some of the other threads on here.

So sorry if I'm being annoying. You blokes obviously have your head around it better than me.

Gadge you are talking about the o ring that goes on the outside of the spigot on the engine block and also the o ring on the spigot that is screwed to the engine block. And what you are saying is air leaks in these spots causing the engine to flood??