3pedalpusher

Just swapped out the plugs that were in the bike when I bought it last spring. The ones I pulled were soaked with oil. I am new to the world of 2 strokes. With the new plugs in, the left cylinder wasn't getting much power. Exhaust from that cyl wasn't getting hot at all. I did just order new plug wires. What things should I start looking for as the cause of the fouled plugs?