New to this site and new as far as maintenance goes on my bike, 2009 wr450. Normally I take it to the dealer for service but I decided to change my own oil this time. I removed the drain pug and the dipstick to get the oil draining. not sure where the other bolt is. Here is what happened. the dealer says my bike takes 1 quart of oil. After draining the oil, (not sure if a whole quart came out) I put 1 quart of oil back in the engine. rode 55 miles. Noticed oil in the airbox after the ride, a lot. Is this from overfilling or do I have another problem?? any help would be greatly appreciated.