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Has explained all the basics need to be looked into compression , electricals/timing and fuel flows.
to properly service your oldy once you have determined compression is ok ( Post your #s) you should get this book on service the cousins ( johnson) . it may not be 100% matchedto your Evinrude but close enough to explain what you need to look into and service.
https://watercraftmanuals.com/outboard/johnson/johnson-302231.htm
400 + pages of knowledge on oldys for $20 is the cheapest service book you can download !!
have you at least pulled the FW to inspect ignition coils which in those years always ended up cracked. flexing ignition wires can break , condensers go bad , sometimes points may need just a touch up see video on timing but everything needs to be looked into .
http://www.youtube.com/watch?v=ga1Cjymj6ms&feature=youtu.be
the carb side channel feeding the top idle cct must be 100% clean .…it has a VERY narrow passage to te top carb portion!
check a few of these things and report back if you don’t have a happy ending 🙂
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