Just picked up an 04 wr450, Got it for cheap. it ran fine but when it warmed up it would sort of hiccup and keep going every few minutes. I don't know a lot about dirt bikes so I was going to get my friend to check it out when I go back to be next month. I looked through the forums here and couldn't find much that helped with that. so I decided to clean up the bike. Took the seat and tank off, cleaned and oiled the air filter, changed the spark plug (it was all black on the end), and put a new coil in it. I tested the coil and it was out of range so I changed it. I go to put some if it back together to fire it back up to warm it up so I can change the oil... and nothing. The most I could find out on this forum was I could have flooded it, so I leaned it over and drained the carb, kicked it with the fuel off a few times, and tried again. nothing. A couple times it fired up then died before I could turn the gas on, then when I turned it on it wouldn't go again and I repeated the process. I must have done that 30 times, my leg can't take it anymore and I don't know what to do. I even put the original plug and coil back on trying to figure it out. When I put the plug and coil back she fired up with the choke on!! I let it sit for a couple min, and when I went to close the choke, she just died again. This happened twice. There was also a small amount of white smoke coming out of the valve cover breather when I was trying to kick it over. I know this is a long post but ever since i couldn't start it I've been searching the forums trying to figure it out i tried everything i could find. now the bike ran fine before, except for that little hiccup. So wtf is going on here? any help would be appreciated!