I just got a 2001 yellow 400EX for $2,000, it is missing the front light setup and the front bumper but other than that is is in good shape, it has a fmf megamax pipe on it and it is plenty fast. but it just started to make a noise, it makes a clicking noise around the jug and as a go it clicks faster and faster. it is not that loud but i can here it i just wanted some help to see what it is and if i should worry about it. thanx you guys l8ter

 

Sounds like you need to adjust the valves. [img]i/expressions/face-icon-small-wink.gif[/img]