I have a twin cyl Kawasaki I think this one is 17HP but might be wrong, anyway the mower was running fine then it just shut off sitting idleing. My son tried to crank it back up it will run for about 10-15 seconds then die down, if you choke it it will try and run some more but dies out again and so on. If it sits a minute it will crank and do the same again some times it spit back through the carb when you play with the choke trying to make it run more. I cleaned the carb out and retried with the same results, We took the carb to the shop we deal at and had him go through it also he found nothing either so we tried it all again with the same results. The motor has gas pumping out of the fuel pump when you pull it over and the bowl on the carb has gas in it after it shuts off. I pulled the valve covers and all the valves are moving in and out. We used different gas from another tank to make sure it wasn't water in the gas as well right after the shop cleaned the carb. I bought a spark checker and haven't tried it yet to see if it is firing all the way until it shuts off yet but thought I would ask and see if anyone has had this issue before. This has been a great motor so far it doesn't have many hours on it, it has mostly been a spare or one my son does his side jobs with. Thanks for any help you can provide.