I just bought a 2006 400ex brand new and I broke it in the way it should have been and been riding it for a couple of weeks now and now all of a sudden you start the quad and doesnt matter warm or cold when you get to about mid range on rpm's its starts to make this chirping noise every couple seconds maybe 3-5 seconds apart. If anyone has any info on this it would be nice I am eventually going to take it in back to the dealer if I cant fix the problem myself only because I dont want my quad tied up at the dealer all summer. aight thanks guys for any help you provide me with.

 

Anyone have any info?

 

Had that same problem but it started making wierd noises at 1/2 throttle and it was just that a valve needed to be adjusted. but this happened on a 300