I have a new (2 months old) YFM350RW. Periodically when I hit sharp bump with rear tires, like topping off a the whoop whoops..., my raptor will bog down. It will then sit and idle fine but if I touch throttle it wants to cut out....if I let it idle for about 2 minutes it clears up....dealer of course cannot duplicate, so they say nothing is wrong....HELP!!!  

sounds as if it is loading up on fuel.

pull the carb and clean it out check the floats for wear, and the needle valve for trash or dirt.

if nothing there then you have to readjust the fuel/air mixture a little.

if it's only 2 months old then chances are the rings are seating in and the valves are getting to wear the need to be and it's getting a little more compression.