Some good friends of mine who are mechanics (Hi, Pete, Duane, Chris! Where are you guys? :confused: ) tell me that two mistakes a lot of people make with 4-strokes are:
Octane. High octane gas, like over 100, will make it run crappy, like the choke's on all the time.
Oil. Since the oil is meant to be checked hot, and a lot of people don't know this, checking the oil when it's cold will make it look like it's low, so when you put more in, it's overfilled and the extra will blow by the rings and foul plugs.
That's the extent of my four-stroke knowledge. Other than--how much oil did you put on the air filter? I over-oiled my first one and went through a couple plugs.
PS--take off the caps lock key. It's hard to read that way. Thanks, and welcome.