Question for you, yb. You seem to know your stuff. I need the woodruff key that goes on the shaft behind the flywheel. I measured it at 3mm wide - 12mm long. I can't find a metric here in town. A bike shop said he had one that's an offset key that advances timing 2 degrees for a Blaster. Seem like it might be a legit idea or would the stock key be the way to go?