I have a JX75 walk behind self propelled mower it has a Kawasaki engine i love this mower never had a problem now all of a sudden it will not start it has spark it is getting gas i have taken the carb off and sprayed it down generously with card cleaner and it still will not start i can spray starting fluid into the choke and it will start and run for a few seconds then it will die can anybody help with this problem. any help would be appriciated