I have a 1990 wheel horse 212-5 that has a vertical shaft 12 horse briggs and it only has one speed and that's wide the heck open! I took it apart and and looked at the governor gear and the the cross shaft but they both were fine but I replaced the gear anyway just to be safe. Well I put it back together and still have the same problem. I don't think it's a fuel issue but at this point I'm lost. Any help would be appreciated.