Have again tested the mower this morning. The mower fires up but dies a few seconds later. I put in an old Champion spark plug, the mower definitely ran better, it reached something resembling full revs but died a few seconds later. This all happened with another spark plug sitting in the decompressor hole. Best result so far but still won't continue running. This was all getting too hard for my arm so I put the decompressor unit back in where it's suppose to go and the mower still continued to fire up but didn't sound as strong with its revs. I think that it no longer floods and if it does, it's not as bad but why does the mower fire up and then die repeatedly?