engines cutting out

[400exrider_88]

i just got an 01 400ex and i know it needs a valve adjustment b/c of a tick noise, but when i rode it the first time, it seemed to cut out like it was running out of gas when it had plenty. could this be a valve problem? oh and when i put the airbox i made on it (milk jug) it seemed to do the cutting out 2wice as much, before it was only at high rpms

[drew416ex]

Sounds like a jetting issue. Exaclty what throttle position is it cutting out or starting to cut out. If you put on a lid and it did it worse, then you are running a little rich. You will have to lean the proper jet curcuit. To determine that you need to know what the throttle position is.

[tar]

Check to make sure your air boot didn't slip off the carb. It has happened to me a couple times!

[400exrider_88]

i bet it might be the jetting. seemed like i could go through all the gears fine, but when i hit the top end of any gear it did it, so that may be why. What will happen to my motor if i dont fix the valve adjustment?

[DIRTRIDER22]

I would just adjust them man it doesnt take very long, If it needs it. I have a 2007 400ex and it ticks like a mo fo. They all do

[400exrider_88]

yeah, but the guy before me stripped out the valve cover bolts. i knew that when i bought it though