Chainsaw Repair

Al, a carb squirts a certain amount of fluid, not know how much fuel or oil it contains. The oil is essentially uncombustible and displaces that amount of fuel, hence decreasing the amount of fuel to air. I understand it is probably not a big deal with a well tuned engine and going from say 50:1 to 40:1 isn't going to hurt anything. But going from 50:1 - 32:1 on a motor already tuned to the edge of lean might be difference enough to push the saw to the point of damage.