'02 Sherpa oily plug?
 

Hello Everyone,
I have a problem. My Sherpa ran last spring like a champ. Did not crank it last summer. When I changed oil this fall to get ready for riding, I somehow put too much in. Only ran it a few minutes before I realized it. Then the bike did not want to idle. I cleaned the carb a few times before I got the low speed jet cleaned enough. Now, if I put in a new plug, it will run smoothly for about a minute, then rough, then die from a fouled plug. I have not touched the air screw. Has a plug of plastic over it? Options? Info? Anything?

Thanx Much!