So when I have the throttle pinned in deep snow, especially if I am climbing an incline, sometimes I will hear this sort of "clunk" noise that I can feel in the whole sled. When it makes this noise I lose some power, it kinda seems like maybe something is skipping. My limited knowledge of sleds would make me guess it is something chaincase related, but that is only a guess. What do you guys think it could be? Any input would be greatly appreciated!