To check most of today's ignition requires specialized, but not terribly expensive meters etc.

I'll tell you where to purchase those later, and offer some help on their use.

FIRST, what I want you to know is there are many simple checks you can perform without a lot of test equipment.

I would guess that 25 out of 100 spark failures could be resolved with some basic checks.

Good spark on each cylinder is essential

Cranking RPMs: it's extremely important in order to generate enough spark at the spark plugs to crank your outboard.

A good battery, a good starter, clean,tight connections need to be present on all but the small Manual start outboards.

On the small models, get some younger help to pull crank on it while you check ignition and please, when he gets tired; give him a little break!

Now you're all set to start checking.

For lack of a better tool, get a screwdriver with an INSULATED handle, and without removing any installed plugs, remove wire from a plug and slide it onto the screwdriver(the metal end).

Now you need to remove remaining plug wires and ground them directly to the block.
Some short pieces of wire will do fine.

Hold the screwdriver shaft 1/2 inch from the engine block, away from any moving parts in a manner so you can observe the spark jumping the 1/2 gap while cranking.

Be sure you hold the insulated handle, if not you'll soon know why....

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Here's some good first checks to try when any new boat problems show up.