How to Troubleshoot Ignition System Problems in SR Johnson 40-50HP Outboard Motors
If you're experiencing engine troubles with your 2004 SR Johnson 2-stroke 40 or 50HP outboard motor, it could be due to ignition system issues. Don't worry, though – you can troubleshoot these problems yourself with a few simple steps.
- Prepare the Engine: Start by disconnecting the spark plug leads and removing all spark plugs. This ensures safety and access to the spark plug holes.
- Find Top Dead Center (TDC): Insert the eraser end of a pencil into the number 2 spark plug hole. Slowly turn the flywheel by hand clockwise until the pencil reaches its highest point, indicating that cylinder number 2 is near top dead center (TDC).
- Mark the Flywheel: Make a mark on the flywheel rim directly across from the timing pointer. Label this mark "2" to indicate the position of cylinder number 2.
- Reassemble and Test: Reinstall the spark plugs and spark plug leads, then start the engine in a test tank and run it at the RPM where the problem occurs.
- Use a Timing Light: Attach an induction timing light to each cylinder's spark plug wire alternately. The timing light should flash in sync with the firing of each cylinder, displaying only the corresponding cylinder's number near the timing pointer.
- Troubleshoot Further: If you notice discrepancies, such as another cylinder's number appearing or multiple appearances of the correct number per revolution, check ignition coil primary lead routing or consider replacing the power pack.
By following these steps, you can effectively diagnose and resolve ignition system problems in your SR Johnson outboard motor, ensuring smooth operation on the water. If you need more assistance refer to the manufacturer's documentation for your specific engine model.
