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Well many parts were the same year after year.-----Post the compression test values.-----Myself I would not order a single part until I had that salt water mess apart and spread over the work bench.

Yes they are a very simple motor.----Easy to diagnose and repair.-----The reed valve opens and slams shut up to 5000 times a minute.-----They rarely cause a problem.----I can not see , hear or feel your motor.-----Up to you to have a look at your reed valves.

Picture of the cowling if it is original.-----What parts do you need ?----Water pump kit is the same from 1980 to 2005 for that style motor !!

If the lower unit is on your work bench and the flywheel does not turn.-----I would say the motor has to come apart.----Start with pulling a cylinder head.----I think your are in for an EXPENSIVE repair job.

Remove the drive ----Remove the motor.---Rebuild the transom.----Opportunity to make it stronger than when new.-----But inspect stringers under the floor as well before deciding on the transom makeover.

The bottom 2 carburetors do not put enough fuel in at idle.---4 cylinders spark at idle.----Bottom 2 carburetors start working at 1800 + RPM

Step #1 is to remove the little plate on the distributor pulley.---Then look for the arrow on the pulley.---Then put #1 piston to TDC.

Most control boxes limit the amount of throttle available for reverse.---No need for full power in reverse.

The cork float is still listed as the replacement today.----In my opinion that means it is very reliable.----OMC / BRP would not have that available if it was et up by ethanol in fuel. !!----I would not hesitate to install one.

??---I thought that is what I said !

Swap the bypass covers.----Run the PRESSURE operated pump of the bottom cylinder.

The 7.5 model had a ----COMET ---decal on it.-----Intake ports on the side of the cylinder were smaller on the 7.5 comet than the lightning 9.8 engine block!

Hands on is the only way to check these things.----While boat is out of the water a compression test might be good to do as well.----Loud noises are not good.---Trouble shooting needs to be done.

Your lake might be 10 miles.----But when a motor leaves the factory they have no idea where it ends up.----The type of boat that it is going on !-----Or if the operator is 20 years or a 70 year old careful fisherman , operator

Loud noises usually mean trouble.-----Was gear oil low , yes or no ?-----If oil was low with shiny metal flakes or chunks of metal you have issues.

Check gear oil.

Charge the battery and have battery load tested.-----No money spent to do that.

Good luck with the motor.

Do the testing and report what you find.---This process is one step at a time.

Was it stored with fuel in the carburetors.-----Having to use choke clearly indicates carburetors need attention !!----I am quite sure it is NOT a reed valve issue.----They rarely fail !