Chainsaw Repair

You might find a less than mirror finish on the intake will work better .Too smooth it has a tendency to cause  the fuel mixture to liquify/condense on the walls of the port .

Going from atmospheric pressure across the carb to a partial vacuum in the crankcase is a pressure drop and in effect has a tendency to cool slightly .

Some manufactures have given the intakes a dimpled finish which has tendency to break up the air flow to prevent or lessen this effect .I've found a finish about like using Craytex is about as smooth as it needs to be .Hours of polishing with jewlers rouge and felt fobs doesn't help much if any .