Viking MB 253 T I've had problems from the beginning with this mower. After cutting two maybe three boxes of grass is fails to start. To begin with I thought it might be over heating, the obvious solution was to do a higher cut but made no difference. After 18 months of being in and out of the dealership I gave up and used it without the box and it will cut all 4 lawns, almost an hours cutting without overheating. So it's not that. Another owner has told me that the dealership recommended that he drilled holes in the fuel cap because it was a problem with air flow affecting the fuel flow. Either way, the model seems to have this problem and after 15 years of no problems with my old Husqvarna that I bought 2nd hand my patience has worn thin with a machine I've bought completely new! Any ideas or other problems, I'd love to hear from you.