i got a new 450 last week, and followed the manual procedures for break-in. i've mostly ridden big bore 2 strokes and maybe i'm just not used to the thumper. it's hard to start, lots of kicks, and sometimes i have to give it gas to get it to fire.it also seems as if during those kicks it gets real easy to kick. also heard a strange buzzing sound in the top of 4th. could i have screwed something up or am i worried about nothing.bike is stock and i live at 6500 ft.