The problem with my outboard and its idle is all my fault. Being the cheap ass that I am I buy the cheapest, lowest grade fuel the add the oil additive. Well, I found out the ethanol in the fuel and the two stroke oil don't like each other.
Solution: Used the highest grade of fuel, it will have the lower percentage of ethanol. My problem is that I have a full tank of fuel and don't want to waste it, remember I'm a cheap ass.
Solution: When you're done using the motor, don't shut it off right away, disconnect the fuel line from the engine or the fuel tank and starve the engine into submission! This cleans out the carb from any unhealthy build up. Hope this helps.....Allan