Plus one for balance gears in a Quiet Line model 1450 garden tractor. My second 1450 had them. Also, in Ken's book, its told of the extent by which IH was forced to produce safer, and less noise producing garden tractor equipment from the Federal government. A lot of time, research, and money went into the Quiet Line models that was all for nothing as the Fed government dropped it's laws at the time. Noted was a story about how automobile race engines adapted balanced engine components, and thus as the story told by Ken, which inspired IH for having/ requested balance gears in the engines.