I got a 03 sx 250 with a problem being the spark plugs. It seems that I get about three rides per plug. It runs like a top when it is'nt fouling my plug. I use series 2000 by ams oil mixing at about 42:1. I run the stock plug and air filter oil of good quality. I am getting really peed off at the bike and ready to sell it. it's a great bike but changing the plug is really a pain in the *%$. Any thoughts?