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If the pulse line to the pump was fully OPEN you would have issues with air getting pulled in through the BOTTOM carburetor.

Check fuel pressure and air pressure from compressor.-----Check for good strong spark on each lead.----Spark should jump a gap of 3/8" or more.

Do not spend any beer tokens on this wear ring until you deal / resolve the low compression !!!

Was this unit winterized last fall ?------Checked the oil in the gear box ?-----Any water in the cylinders ?-----Battery fully charged and load tested ?

It is a drain for a cavity to prevent freezing / cracking the gearcase.----Ok---You say you are in Florida.----When they built the motor they did not know if it was going to Florida or Alaska.

The fuel pump runs on PRESSURE pulses from the lower of the 3 crankcases.-----If there are no pressure pulses the fuel pump does not work..-----That is not a breather line.-----It simply pull any fuel spillage into the engine.----A safety feature you might say.

Best to book call the shop and take it in.

Compression test first.----Post the numbers.-----

Very common for those to be missing. ----Many ways to fix that.---Build it up with tape.----Split piece of plastic pipe.------Make one from plastic / wood.-----Or simply buy ( $22.58 ) a new roller follower assembly.

Maximum spark advance is clearly identified.----It is the top screw on that lever.---Leave motor stopped.-----Turn propeller.-----Have an assistant SLOWLY move control lever to full throttle.------Observe movement of linkages.-----The maximum spark advance rarely needs to be adjusted for the...

Part # of the pump that was installed ?----Was it mounted over the pulse port on side of top cylinder ?----Replaced plug leads ?-----Water pump impeller replaced ?----Compression values today ?

Switch coils and see if problem moves .

Normal and do not plug that hole.

Or use an old trick that I have used.------On the way out ---" trees on the left"-----On the way home ------" trees on the right "------As others have said you need to plan carefully for this venture.

It gets worse.----If a carburetor is plugged , then no fuel goes into 2 cylinders and no oil !----Do not run this motor again.-----Find the issue and fix it.-----Find the small hose ( oil recirculation ) that goes from bottom of engine to the top bearing area.-----On the starboard side of the...

Well ---80 PSI is low in my opinion.

That uses the 120 HP FORCE engine.-----I would do a compression test on it before spending any beer tokens on this boat.

Mechanic at dealer was working / doing service work on a 300 HP E-TEC G2 on a silvery 20'+boat.----Also the 25 HP E-TEC on the same boat.------6 hrs on that will generate painless revenue.-------An early 80's V-4 and the owner are not popular at big shops !!

When pully broke the valves stopped moving.----Pistons likely hit valves and bent them.----Remove valve cover to inspect.---Likely lots of valve clearance as valves might be stuck open now.----Easy fix to replace bent valves I think.-----But that be my opinion !

Yes-----But they no longer rebuild older ( 1984 ) motors.-----Motors are older than the mechanics.----Owners of older motors will howl and complain at the cost to fix these motors.-----Owners of $80,000 boats will say " thank you " when they see an invoice for $700 for service work.