When you find SeaFoam, make sure you get the gas treatment not the tranny treatment. The two kinda look the same but different if you can guess what I mean. Don't follow the instructions which are focused mostly on maintenance. Instead, put in 1/2 the can to a full tank of gas, run it out, put the other half in, fill up and run that out. Doesn't have to be done in one day but should not be left to sit for a month. If the bike hasn't been ridden for a while (Shed Queen) don't be too concerned about a lot of white smoke to begin with as that will clear up.
When it comes to trouble shooting/fixing it is my policy to always do the easy stuff first.