It's leaking fuel out of the vent line on bottom. I have took bottom off found no trash but spared with carb cleaner still leaking any ideas on the problem. I'm new to this high performance lawn mower engine. It's on mud buddy hd4000 thats had new intack and head. Any ideas?

This has been discussed, in detail, in at least 2 threads in the last 2 weeks.

Thanks sorry i missed it.

Better yet, if you haven't fooled with carburetors much in your lifetime, get a hold of the tuning guide mikuni has for the HSR 42. Pretty good information in there if you don't understand how it works.