Re: mercury 7 1/2 hp

[David Stanton]

Something I’ve noticed on CDI ignitions. Because the voltage is high, but very short duration compared to conventional ignitions, the spark can be hard to see in a spark plug gap – even opened to 1/4 inch, especially if you are in bright light or sunlight. On some, I’ve had to close the garage door and shut off the lights -them pull the motor over to see the spark.
Dave