I recently purchased a 2001 yz426f. I am experiencing problems when i try to start the bike when it is cold. The bike tries to start but just dies. After a while it eventually fouls the plug, and when i put a new plug in it starts on the first kick. After the bike is started it will start fine it is just getting it started for the first time. I was wondering if this could be fixed by changing the piolet jet. If anyone has any tips on starting i would really appreciate the adivce. I was also wondering if there is any quick mods that will give me some more performance out of the beast.