I bought a copy of WIS on ebay for $40. Not a bad deal. Was difficult to get it working but, found a bulletin for the 119 motor that said "air injection dampner flap" was mislodged, and that it caused lots of blue smoke and that it would fill the exhaust with oil. This seems to be in line with my problem, anyone know anything about the air injection / crankcase ventilation on the 120 motor?