my 450r problem

[Stealth450r]

hey when i ride over any whoops or jumps my 450r cuts out/ bogs out untill i let go of the throttle. in my flat field it runs perfect but once i hit whoops it sucks. does anybody have any ideas what this might be.

some people say theirs is also doing this & they are finding plastic pieces in the carburateurs & in the filter in the gas tank...they say even after they clean it more comes in & it does it again..clean it thoroughly & see if this is your problem.