As far as your idleing problem, remove the carb(easy), disassemble completely,(no shortcuts) spray carb cleaner through every little hole you can find. I just did this to mine, and they're purring like new.
Thanks! Printed up, also put in the list of things to do that is bulging my wallet... people think I'm OCD because I constantly have little notes sticking out of my wallet, as I think of one thing or another that I "need" to do to the boat next... I guess owning a boat is the definition of OCD