I bought a 2007 wr250f in Aug of 2007 - ran it for around 10 hours before i noticed the hole in the air filter. I simply ran a set screw with a allen head into the hole with some lock tight. It looks like a permanent fix. Dust was in my carb so I removed it and cleand it in and out. How long do you think it takes until a problem can arise? Top end wear? 10, 20 50 hrs in dusty conditions. My bike still runs good but am worried about the long term. Any thoughts?