Definitely coming out of exhaust. I thought electrical because if I hook a jumper battery and run it that seems to alleviate the problem for a while. even though the battery checks out OK I may put a new battery in it to see if that makes a difference. Isn't the ignition electronic?
I have a 2010 Grasshopper 430D that runs and mows great when I first start to mow. After about 1/2 hour of mowing it starts to bog down and then starts blowing white smoke. Any ideas of why would be helpful.