My Mother has a 1995 Model 10515 that will not start. It has about 110 lbs. of compression and has spark. I spray starting fluid in the carb and it will not even fire. My guess is that it is a timing issue, but I am not sure if a 2 cycle can be out of time ?? It seems as if she has had problems with this mower for awhile. It is in real good shape and I have committed to her that I could make it run. Any suggestions to help me save my reputation would be appreciated. Thanks