Re: jphnson 25 ignition / fuel ????
well...you really should methodically test your system following the cdi troubleshooting guide or your OMC manual...becasue it can get expensive quickly throwing parts at it.
1.Remove the black/yellow wire from the plug going to the powepack...does the spark return?..if so, your stop circuit has a short somewhere and is grounding out the pack as this is how it functions, it grounds the pack when your key or stop button is in the off position. This wire should also be checked for any voltage it may be carrying to the pack.
2. Liklihood of both coils failing at the same time is pretty small. At the marineengine.com site it listed them <0581651> as NLA. So if you found 2 that's a good thing.
3. Powerpack failure would result in what you've experienced, however < sounds costly > on the electric start model it seems that with at least one setup the stator combines the charging for the battery, the high voltage coil to supply voltage to the pp, and also the pulse voltage for the trigger to the coil. Soooo..that rascal could be acting up.
You see that it could be something as simple <cheap> as finding something in the kill circuit causing the pack to ground. Or, going to the other extreme, multiple failure causation < dat's a term I'd use for the shotgun replacement approach>.
Pull your flywheel so you can determine what components you have providing the battery charge, high voltage for the pack, and a triggering voltage to the pack. Marineengine.com has diagrams to help you identify these components.
Should you decide to replace it all, throw a new rectifier into the mix as well..on the scale of things that one is fairly cheap.
Believe me, I'm just half a page ahead of you in understanding how these 2 cylinder cdi systems work. Many on this forum could write < and may have for all I know> a down to every circuit explanation of what's going on. The most I can comprehend is a 4 th grade level of understanding...the pp acts as a switching component for the voltage going to the coils and the signal for this voltage to leave is provided by the trigger sensor. The high voltage that the pp sends on to the coils comes from the ignition charge coils under the flywheel.
How all this happens is explained in the OMC Factory Manual, at least it is on the manual for a 1978 9.9/15 hp.
If you believe that you have a misfire, here is where you need to start. 