Thanks Blumbly, have poked at the seal as best I can with the boss on and it feels soft, can't see any liquid around there but it was night. Spark is definitely blueish.
Think I may have resolved the carby issue ie it no longer leaks, I had to do the screws holding it together very tight, I tried to fire up the mower this morning, after a few pulls there were some explosions/smoke and the chug, chug, chug so the mower wants to start. I'm now thinking I'll address the compression, anyone know what ring size to get for the Mayfair Deluxe? Also Blumbly, to get the boss off do you need to take the engine out of the mower to stick in a vice? In the process of looking at the carby again, the throttle switch has no effect on the butterfly valve, how can I fix this?
