john deere 1986 130 wont start

I have a jd 130 with the kawasaki fc 290 9hp engine.motor turns over but has no spark.have changed out coil but still no spark.any clues as to what is wrong?Is there some kind of igniter module ahead of the coil?Do they go bad?If its a safety switch failure the starter would not engage right?This is my first john deere and I really dont know much about it and a wiring diagram would be helpful as some wires down by the starter are disconnected