Ok my 99 yz400 is a bear to start cold. I'm thinking of richening up the fuel screw a little. Do I need to do all the warming the bike up and letting it idle to adjust my fuel screw, or can I just turn it out about 1/2 or 1 turn and then start it up and check? Also, after I get this jettng right should I buy a new spark plug? Maybe something is wrong with the spark plug too. Oh yea, I tried to take the tank off to take out my spark plug and noticed that even when the fuel petcock is in the off position, a small amount of gas still comes out. Anyone?