87 mercury classic 50/45 hp,, not firing

Not firing on the bottom two plugs..not sure what to do..should I start with the swich box...please help if you can...

Re: 87 mercury classic 50/45 hp,, not firing

Go to CDI electronics and download troubleshooting manual and test ignition system....

Re: 87 mercury classic 50/45 hp,, not firing

thanks,that help alot

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