This is my first time in one of these type sites. Maybe you guys have some ideas whats going on with my Lawn tractor. Some time ago 2-3 years ago i purchased a Yahama 6700 lawn tractor from an estate sale. With just a little maint . new battery etc. it has been a work horse. Now all of a sudden when ever I turn on the cutting blades it begins to choke out an die. I have cleaned the fuel tank ,and lines etc. Any ideas?