I have had my bike sitting for 2-3 months without stable in it (didn't think it would be sitting this long) I did a front end swap that required new throttle cables. I got everything back together but it runs pretty rough and when I rev it up a little poof of black smoke comes out the back. I am assuming this is because the fuel is so old. So I figured I would drain it (there is probably 3 gal left. The problem is that I cannot see a way to drain it. Can anyone help?