I have a craftsman 917370431. Mower is 1 year old. It pretty much has started on 1 pull since day 1. A couple of days ago I replaced the blade as per directions. When I started it it started to make a clunking like sound, almost like the blade was loose. I stopped it immediately and tightened up the blade bolt as much as I could. When I went to start it again it wouldn't start at all. Thinking I may have flooded engine from tilting the mower I waited a day and tried again but mower still isn't starting.

Anybody have any ideas as to what could have gone wrong? Thanks in advance.

Anthony