Oddly occuring petrol smell

During the repairs to the bike following the circular saw I took the oportunity to replace the snorkel into the air box. (A mistake if you remove it bike ran **** without it, far more boof from the throttle now its back in.

ANyway, just wondering if anyone can make a suggestion as to why I now think I can smell petrol once I've pulled up and switched off the bike.
It would make sense had I just removed the snorkel, but if anyhing I'd have thought the bike would be running leaner now by comparrison to how it ran with the snorkle out.

I dont pretend to understand the hocus pocus of an engine but if anyone can tell me anything to check/glance at it would be apprechiated.