I confirmed the primer bulb is supposed to have a hole in it. So I am back to the fact the mower still only runs for a limited amount of time. Is there a way to test the coil, the mower runs strong for a limited amount of time and then just stops. I assume that the carburetor is clear and doing what it is suppose to do. I am thinking the coil gets hot and the spark gets weak or non-existant or at the very best weak.