Well i have been having a pop/backfiring problem lately have it has got worse over the past few days. Im thinking its a dirty carb or something with the carbs. Even though i do have a homemade can it ran fine with no problems for about 4 weeks with the can. So i am pretty sure its not that but never know it could be. Thats why i am buying a actual can for it so i know i wont have any issues. Any who today i put SEA FOAM in it today and things seemed to act up after i did. I went about 300 feet and knew something is not right so i stopped checked the plugs and the pto side was white! I put a new plug in it ran it about 20 feet and still not right checked the plugs and white! Got the sled home and i did a psi test still over 120 psi so i know its not blown. So my question is by putting to much sea foam in will that cause mu plug to turn white?