Malossi 187 cc et4

I've just change the cylinder on my et4. It all went smooth, but when I started the scooter it sounds like I'm driving without an exhaust. I don't see any leaks but it blows a bit on the kick start side of the cylinder. It's not leaking from the exhaust....

Any suggestions?

Or is it just this noisy with the 187cc maybe it is the cooling air I feel.