Ignition spark timing is controlled by a sensor that detects magnets in the flywheel. The sensor is part of the flywheel stator assembly. The sensor is connected to the Power Pack. To check the operation of the system, check the various elements in this order:
- all connections in the circuit
- Power Pack
- spark timing coil in stator assembly
- flywheel magnets
The service manual will give details. Attempting to make repairs on an engine without the factory service manual on hand will put the repair process at a big disadvantage. Get the factory service manual if you want to work on your outboard engine yourself.
The factory service manual should offer advice on diagnosis of spark ignition problems.