This is an old thread. You will get better response from a fresh one. On the Repair or the Toro forum. It is hard to get carbs worked on now days under warranty. Seems most of the time the owner neglect to keep fuel fresh enough is to blame. The Chinese engines were bad to corrode the needles due to poor coatings the last couple of years. The Toro snowblowers had trouble with it as well. It is supposed to be fixed. Kohler was supposed to warranty the problem. However I have seen many Husqvarna lawn mowers the last two years setting at the curb or going to the scrap pile with those Kohler engines on them. Most of them had no carb on them. My dealer scrapped about a half dozen of them . His excuse was he could not get parts for them, and new carbs cost to much.