Hello, I have a 2002 yz426f that i recently just bought. I have ran it perfectly fine for the last two times i have ridden it with no problems. But today im getting ready to take it out to the trails so i start it up for about 20 seconds then shut it off. I then try to start it up again and it wont start! i have tried holding the decompression lever and kicking it twenty times with the hot start on in case it's flooded and it still will not go. I just got off of a 2 stroke and i really hope that this isnt another plug fouling problem. any ideas on whats wrong?