No. Get a new plug. . Yes to above but if you can't then wash the plug in petrol (gas) - (be careful when doing this as there is a danger of fire). Then use fine sand paper to clean up the electrodes...
My opinion, no. You have to mix gas for the two stroke, and two stokes are not as powerful.
If your 2 stroke dirt bike starts to smoke really bad that means you have to much oil in the pistons or the wrong kind of oil.
The 140 hp model Johnson outboard runs a plug gap of .030 in.
Because of the more pollution of a 2 stroke where it burns the oil.