I just got my new 426 a couple days ago and things started out fine with it but have gone downhill.. I've only rode it for a total of about 1 hour. When I am going slow (from idle to about 1/4 throttle) and give it gas fast, the bike bogs and will die if I don't let off. If I give it gas slowly it works fine. Is this jetting or the accel pump problem that I've read about? Help please!