I have a 50 3100 with a 1961 235. I have a 12 volt flywheel in it. Before I figured that out I went and picked up a 6 volt stomp starter and had it rebuilt. After installing it I found out about the difference between the 12 volt and 6 volt starter. No go. Does any one out there need to go from a 12 volt to 6 volt starter? I would be willing to trade a rebuilt 6 volt for a 12 volt core.