Bruce, you definitely help me in making sure the carby was ok.
I never noticed a miss, that's why I never mentioned it, but thanks to the pop rivet I had to open the whole thing, and as a result I saw the dirty muffler.
I noticed the mesh inside the muffler and it doesn't look too good, I will replace it in the future. Problem here is the price of spares: a primer pump cover costs the equivalent to u$s32, and a diaphragm, u$s 14. Crazy. I'll shop around. Cheers, Henry.