i have an 07 700r, and if i stab the throttle as fast as i can it bogs pretty bad. you can rev it fast if you dont press the throttle too fast. once you get passed the intial bog though it revs fine. what could be the problem? restricted air flow? the TPS? too rich? i changed the spark plug. the inner white ceramic part of the plug was light brown. the threads were kinda black and wet though. i want it to rev nice and strong no matter how fast i stab the throttle. oh and it also makes this blooomp sound when it bogs down to almost stalling. any help is appreciated. im thinkin its gotta be the air filter. it looks pretty dirty. the reason i say that is because when you first hit the throttle the engine isnt sucking as hard, so its not able to get air through the filter, and after the initial revs its sucking pretty hard getting through the restriction. i could be wrong though. thats just my guess.

 

Take out the filter and see if it still does it.

Wet plug means too much fuel, but as to why you are getting too much fuel...no idea.
You say completely stock?
Have you removed airbox lid or maybe removed baffles?.

Raptorforum.com is a good place to ask Raptor specific questions

 

Im having the same problem with my 08 yfz i have only had it 2 weeks and the first week it was fine then all of a sudden it started i took the baffle out of it for about a day and put it back in but i didnt think that would hurt it but it has been acting up since then.