I was riding my 05 kx250f yesterday when i noticed it was running strange. I rode it for about 1 hour, took a brake then went to start it back up again. I noticed that the compression seemed really weak when i tried to start it and i went to ride it up a hill and it just bogged out. The bike ran great before this all started to happen. Then i went back to the truck and noticed it was smoking!! I had lost almost all oil out of engine from a little whole that is for god knows what in the front of the cylinder above the exhaust. I dont know much baout four strokes or what this is but i know its not good and alot of dirt could of got in there and i could be out of riding for a while till i get some money to fix it if it has any engine troubles.