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https://wrcoutboards.org/wp-content/uploads/2021/02/The-Phase-Maker-CDI.pdf
clean the GC cavity and water drain hole !! see pic. full of hardned sand and gunk on mine
great little engine…sips fuel trolls all day. Make certain the small top side idle tube is clean !! see diagram
it may be a phase maker ignition.works very well point will look dirty but their work fine by MAKING vs the usual breaking of the contact point.
if so….. book says DO NOT USE THE KILL BUTTON IF BUCKET TESTING it can kill the coil !!!
if no kill button you kill it with the choke button.
what problem do you have… no sparks ??
you can download a maintenance book for $5.95 covers all merc from 1966 to 1975 . 3.9hp up to 6 cyl
Service Manual Vault recommended FREE downloads
I don’t see it anymore on the site but contact them . I had mine locally printed
Mercury Mariner 4 Horsepower Stator 174-3996 174-4469 174-4470 | Outboardignition.com
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