2003 / 2004 15 hp Johnson stopped running while underway - where to start troubleshooting?

[dgrit]

My 2003 / 2004 15 hp Johnson (model #J15RSRS) stopped running while underway and won't run. Replaced the gas line from tank to motor and that did nothing. Suggestions for where to start troubleshooting? Any help is appreciated.

 

[racerone]

Water pump checked ?-----Mixed gas and oil at 50:1 ?---- Checked for water in thee fuel ?-----Checked lanyard switch ?----Did it stop suddenly ?-----Check to see if flywheel key sheared.-----Checked the spark ?