I own and enjoy riding my 250x it has been great and at 69 hours I had the top end rebuilt that included new piston,rings,pin,clips,valves shimmed etc by my dealer. Any way I have now done 4.5 hours on rebuild and all of a sudden it has dumped all the engine oil into my air box what a mess can this happen???? there is no oil in the engine dont know how it was still going the air filter weighed about 2 kilos and still trying to get it cleaned up it was fine till my dealer did the top end can any body help is this my dealers problem and does anyone know what has happend for it to do this, faulty or broken rings maybe and what other damage has this done I need to know as much as can before I talk to my dealer. :( :(