My friend has one of those big mowers and I worked on it last year with no success. Problem is it will start fine, mow for a few minutes then shut off like you killed the switch. Was getting fire, so went through the fuel system but found nothing. Took apart the fuel pump, cleaned it, checked the lines, nothing...so put it back. Solid, heavy mower but still have to go through it again. I haven't heard anything bad said about them. This mower ran great until just last year then started that sudden dying and hard to start back.