Just thought I would throw this out there and see if any of you guys notice more exhaust smoke from your D-600's compared to the D-400's and the F engine'd models. My 1974 7263 smokes twice as much as my other 2 mowers and they all use the same 32:1 Lawn Boy oil mix. Most of you here know mower that I am talking about and saw the ground up resto. Everything is either new or reconditioned on this mower and every part in the carb is brand new. The float level is dead nuts too. I checked it like 3 times. Maybe it's because the fixed jetting is a little on the fat side??? I dont know. I would like to make this thing run cleaner but maybe that's just the way they are. Tell me what you guys know.