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What are the compression values ?-----Does spark jump a gap of 5/16" on both leads ?----Checked the reed valves.----Checked fuel pump diaphragm ?

The washers for the Evinrude drain screws are in stock at every boat shop.

In the old " universal magneto " the right hand breaker points were for the top.------Now the different style magneto found on a 1976 model 15 HP may well be opposite of that !!!

A1973 model would be green.----So post your model # here.----That could help you in finding parts in the future.

??----In nautical speak----PORT ---side is always the same whether looking at the front or the back of the boat !!

Fogging oil was available 50 years ago !!

It was posted as a 1997 model.

Compression is even and that is a good sign.

Visit a site called----leroysramblings-------Lots of useful info on your motor there.

That will give you excellent and meaningful test values.

Take the lower unit apart.-----Inspect all pieces .----Inspect housings that hold / locate bearings.----Price parts / availability.------Perhaps start a search for a used lower unit.

Answer these.----What is your motor doing / not doing?----Do you have spark that jumps a gap of 5/16" , yes or no ?-----If you suspect 180 degrees out , then test by switching the wires.

????------This is a V-6 outboard powerhead.----Mounted as an inboard motor.------Mounted on top of a jet drive pump !!!-----It can not be tilted up and turned to fiddle with power tune or other potions !!

A 60 degree V-6 should idle nice and smooth

Trouble shooting starts with a compression test.------Post your numbers.

???----It is a V-6 power head.---Also indicated with 6 compression values posted.-----And those have always used head gaskets !!!!!

In the big picture a head gasket is cheap.-------Pull the head and have a look in there.----These engines live a tough life in the hands of joy riders.

Suspecting a bad fuel pump ??-----Then get an assistant to operate the manual pump during the test run.

When these engines left the factory there was a disc on top of the block with a serial #.-----Powerhead may have been swapped at some time.----Not going to happen , but if you walked over I could show you one of these 175 big bore crossflow engines !----Good luck with it.

There should be a round metal disc with the number.----Post some pictures of this motor.