Mine did the same thing today did a quick move to the grass and when I started it up to move it back saw a little white smoke it blew away but it bothered me so I got someone to stand behind it I reved it up and a little smoke when I let off the pedal what would I add to clear this up or to troubleshoot it thanks

 

When cold I wouldnt even worry about it until I saw it when at operating temp.

 

It has been a while since i started this thread, and i havent seen this happen again since.