My brother is at work and im off today so he asked me to post this,so please bare with me..any help would be great.He took his 05 450R out yesterday and it ran ok,about 20 mins into his ride the quad like ran out of gas and cut off.Its started back up,and runs fine till you hit the gas,and then it dies again.he has some work done to it such as cams,revpack,full exhaust,jetted,ect.We took the plug out and it was fine,but we cleaned it up some,we ran it out of gas from idal,and then tried it again and it still did it,than we tried the gas line and started it for 10secs and let it run,and then we put the gas line on and tried it again,nothing......Also on monday he put new headlight bulbs in and thay are a little more watts then stock,could that be it.......We are stuck and its going to be a great weekend here in Nj !!!!! any help would be great.please help....Thanks Guys

 

He may want to check the needle to see if the clip came off.

 

Even if the plug looks good, change it. Sounds to me like it is no good. Besides, even if that is not the problem its cheap.