help adjusting carb

C130 Chief is right, you can smell fuel from a tail pipe if it is too lean just as easy as if it was too rich. If it is too lean the spark can't fire the mixture at times so it passes thru the exhaust as unburnt fuel. If you are on the rich side the mixture can't burn all the way so it pass thru the exhaust as incomplete burnt fuel, both will smell the same to the naked nose but not an exhaust gas analyzer.

Chuck