Tried using the B yesterday and she just wouldn't start. Plenty of good gas so that wan't the problem. It would try to start and putter for a few turns but cut right out. Seemed to be running rough a bit. Not sure where to check for issue. I think changing the plugs should be a start. Am not able to get plug number but I think it's AC 45 if I remember. Maybe someone can give me the correct plug number. This tractor has worked very well for me and I haven"t had trouble with it starting when it"s cool. I do have trouble when it"s hot though. Also she has out door digs right now. Any help getting this thing running proper would be great.