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The compression is excellent !----I believe better than a new motor.----Is your gauge accurate ?

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.

Does lower unit shift to FORWARD with an up motion of the shift rod , yes or no ?-----Why do you feel you have to change the shift rod ?

Leaking head cover gasket would not allow water to go into a cylinder.

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.

Does spark jump a gap of 3/8" ( 1 cm ) on all leads ?----The type of sparkplug has nothing to do with that test.----Might be running on 3 of 4 cylinders.----Clean carburetors.-----Remove lower unit and check for carbon blocking the exhaust.

Maybe it was in a hurricane event ??

One screw removes intake screen.-----Then make an adapter for garden hose.

Yes those SUZUKI built motors were different.

Post when you make progress.

The 79 models did not come with the primer from factory.----But lots of work / replacement of powerhead perhaps.-----First used on the 70 HP model in 83 I believe.

??----Super high RPM- ?-----Could be an issue in the lower unit.-----High RPM may have done damage to valve train.----Sheared flywheel key.-----Time to do some inspection.

Information needed.-----Post compression numbers.--Does throttle plate open all the way ?-------Have you checked flywheel key ?----Does spark jump a gap of 3/8" or more on oth leads, yes or no ?----Sounds like it is running on 1 cylinder.

I do not believe the 85 model used the stuffers.----I believe this will bolt together fine as it is.----If you are worried then take a razor blade or exacto knife and trim them to your liking.

It would keep me busy for sure.

This motor needs more work than what the owner is aware of at this time.-----In some areas there are better motors than that thrown out for scrap.----Sorry to be blunt here.

I hope you are correct in that the market for used parts will improve for the seller.----Some have paid to store / hide parts for years.

Quick silver is MERCURY !----Know of a dealer that offered a " winterizing special " package one season.-----Installed aftermarket impellers.-----Had to send his people out to pull 28' boat out of the water to install new impellers.-----No more trying to save folks $10 after that episode.

The pistons show lots of wear.----You need to think this project over very carefully !

Agreed---Usually only an impeller is needed.-----Use factory impellers.-----Many good water pump housings are thrown out for no reason.