There are YouTube videos covering just about any service work you have to do, even if it isn’t specific to your 1969 1.5 HP, the techniques and procedures will be similar. Crosbyman usually has some ready to list that are helpful. I gathered some other online links for you, the first one being a parts list breakdown for your motor from MarineEngine.com. It should at least help to show you how things come apart. The other links are probably more than you need but they’re all pretty informative and helpful in one way or another. Look through and see what you need.
https://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1969&hp=1.5&model=1R69C
https://maxrules.com/trouble.php
https://maxrules.com/fixtuneitup.php
https://www.leeroysramblings.com/acquiring_and_restoring_antique.html
https://www.leeroysramblings.com/johnson_magneto.htm
https://www.leeroysramblings.com/Troubleshooting%20OB.htm
https://www.leeroysramblings.com/OB%20carburetor_repairs.html
https://tinyurl.com/3HP-Tune-up-Procedure
https://tinyurl.com/3-HP-carb-rebuild-tune-up
https://tinyurl.com/3-HP-ignition-system
