This is my first 4 stroke bike. I have always had 2 stroke bikes. My problem is when I am in 3rd, 4th or 5th gear and get in the high rpm range it wants to stall for a second or two then pick back up speed. This is when my 2 stroke bikes come alive and you better be holding on. It seems it does not want to rev all they way up to. Plus when I am in like 4th gear and go to 5th it stalls for a second then takes off. The bike is stock and it is brand new. Is this ok or should I be looking for something. Thanks.