re: Mercury outboard repair help

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The stator, trigger, switch boxes, ignition coils, and spark plugs are the only parts to an old school ignition system. There are several threads on thehulltruth.com and YouTube videos that walk you through the diagnostics of these systems. If you have a decent multimeter and are somewhat mechanically inclined, then this should be something you can handle yourself.

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My dad is helping me with this and has been a automotive mechanic for most of his life so we are investigating things like the stator, coils, and boxes. We changed the plugs and CDI boxes already so trying to rule that out, but he thinks its still electrical.

I think its also worth noting that the inside of fuel line before and after the fuel filter by the motor was severely corroded, so we changed that but I'm wondering if the fuel line from the tank to the nipple at the back of the boat coming out the hull is also bad.

I spoke with a friend who is very savvy with outboards and he tells me that most of the outboard mechanics he knows make most of their money off changing collapsed/corroded fuel lines from someone running ethanol based fuel (we never have but someone before us could have) and vent tubes being clogged with mud divers or other bee nest.

So i'm going to run the boat again on an external tank and check the easiest issues first. The motor just iddles too well and runs great at lower RPM's which is the confusing thing.