I have two 225 omc with know spark from spark plugs i did all i know how to do
If you do not have the service manual and special tools to troubleshoot the ignition system, then you may have to either enlist the services of a trained technician or keep buying new parts and installing them until the motor works correctly.
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-- Travis McGee, main character in a book series by John D. McDonald
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.