Well i just picked up a YZ125 , this is the first dirt bike that ive owned in about 8 years. WHen i brought the bike home it was smoking pretty bad, but seemed to run fine, maybe a small miss every now and again. So i looked at the book to get the oil fuel ratio, drained all the fuel, replaced with fresh fuel and yamalude racing series oil, at a 24:1 ratio, and i also added a fresh plug. Fired it up and its still smoking pretty heavily. Can this be caused my too much oil or not enough? Also there is some sort of oil dripping down from around the air box area down on the swingarm, could i just need a new filter?