MOter Farting

I just got my new 400ex friday and I have took it out took it easy for the first tank and now that i am riding harder it kinda farts before it goes.......like a split second it goes uhhh then takes off any suggestions since still under warrenty??

thanks

[Sparkles]

ur in to hight of a gear when u take off ?

[RideRed400EX]

Sounds like a jetting problem, probably the fuel screw. Since you just picked up the bike I would bring it back to the dealer to have it dialed in.