Weak Spark

Hi, I'm having a problem with weak ignition spark on my YAMAHA 15 horsepower four stroke. I've replaced the CDI, Ignition Coil, Spark Plug Caps, Charge Coil, and the Pulser Coil + new plugs and still have little to no spark. Can someone give me some direction?? Ron

[boats.net]

Yamaha doesn't use a high powered ignition system if it jumps a 9mm spark gap it's ok.