ORIGINAL: RTK
If the atmospheric vent is receiving any positive pressure try running a line off of that to a less pressurized area.
RTK what do you mean run a line off??? I did not understand.
I made a vent hole for the carb to breath since the spacing between the firewall and the carb opening was very close,
Today I popped over to the local Hobby club was asking some questions in regards to the problem one did say he closed his Firewall port hole completely and that solved the problem.
Before I do attempt any firewall modifications I will retune the carb needles as mentioned above, RTK would you be kind enough to explain what you mean by running a line off ? and if all else fails I will seal the firewall again and see.