Sounds like a typical snow king to me. Honest. The noise they make is the valves I have been told. I always thought it was that plus all the vibration from the shaky old snowking. Mine will shake so bad running full throttle the snowblower begins to twist back and forth a bit. The chute handle is swinging, the chute is bonking back and forth, the handles are buzzing, the cables are flapping, some of the pins and bolts are turning. It is amazing to me the darn things work so well and so long.