Respect and common courtesy are no longer taught by many parents.------No longer taught in schools.---It is against the law to set young folks straight wnen misbehaving.------Court system no longer punishes for bad behavior.
The concept will not change.-----Every day there are new boat owners who need to be taught.----Running a boat / motor is not the same as jumping in a car and pushing a button.-----Do not run an outboard dry !!!
There are 5 bleed inserts.----Found when removing transfer port covers.----Not found on the bottom cylinder.----Tiny nylon inserts.----Often have gone missing.-----It should not be hard to set low speed mixture screws.
Checked for missing bleed inserts ??---Low speed MIXTURE screws are to be adjusted with boat in the water and idling in gear.----Adjust ( rich ) till bogging goes away.
If it runs " great " , then why do you feel you need to adjust stuff.----Best to replace water pump impeller.----Test overheat horn.----Post compression test numbers and record them for future reference.
According to the parts book the primer valve appeared in 1983 on the 70 HP.----Something is unique to your motor.---Wrong ID plate or powerhead was replaced.