well my lawnmower is resting now.. should I be worried if white smoke comes from the filter area when we pull the string to start it..this time a big puff of white smoke came out to greet us when we pulled the string after letting it rest it had quit on me due to a grass clog I removed it and yanked the string and a small amount of white smoke came out. So like I said we let it rest it started after a few yanks but let out the big puff of white smoke what causes this??? I raised the wheels. The grass and ground was dry. Thank you for the info in advance.