G'day folks,
It's easier to remove the air filter on these, than it is to pull the snorkel off the carby. Then just a small shot of Aerostart or similar down the tube, and pull it over immediately.
Nope, the likely spots for intake air leaks on these are, between the carby and the intake spigot, or between the spigot and the intake port on the barrel.
These are both o-ring seals, and the o-rings get hard with age and heat. Then they don't seal very well.