Would run for about a min. before I replaced the plug and fuel filter and fuel pump . Now it will not start at all

Hi,
See you added a post to one 3 1/2 years old. Many newer info is available. Most commonly the common exhaust valve adjustment that those models need in their first qoo hours or less. A very few had bad cams, but those should have all failed by now.
See the YouTube video at:
YouTube - Lawn Mower Repair Valve Adjustment
Not exactly the same engine, but it is accurate.
Peace,
Clarke